Søren Kjærsgaard<p>In January, I bought two 10V references, based on LM399. I was a bit skeptical on the design, following Marco Reps on YouTube does that to you 😂, but a teardown revealed quality components (Vishay precision resistors) and a decent circuitry and PCB layout.<br>I measured the standard deviation on the 10V output, using my 3458A, and I’ve done so monthly-ish ever since, leaving them powered all the time. <br>In March I added two more, unit 3 and 4.<br>Result so far: unit 1,2,3 are converging towards 1uV SDEV, unit 4 however (separate curve), started out sky-high, but it has now joined the ppm club 🤷🏼♂️😳<br>Someone mind telling me what’s going on? I mean, it’s wellknown that the noise drops over time, but why? What physical/chemical factors comes at play, causing this behavior? <br><a href="https://techhub.social/tags/voltnuts" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>voltnuts</span></a> <a href="https://techhub.social/tags/ppmgeek" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>ppmgeek</span></a> <a href="https://techhub.social/tags/electronicsengineering" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>electronicsengineering</span></a> <a href="https://techhub.social/tags/testandmeasurement" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>testandmeasurement</span></a></p>
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Ars Technica News<p>Engineer creates first custom motherboard for 1990s PlayStation console <a href="https://arstechni.ca/NBSz" rel="nofollow noopener" translate="no" target="_blank"><span class="invisible">https://</span><span class="">arstechni.ca/NBSz</span><span class="invisible"></span></a> <a href="https://c.im/tags/electronicsengineering" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>electronicsengineering</span></a> <a href="https://c.im/tags/hardwarepreservation" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>hardwarepreservation</span></a> <a href="https://c.im/tags/Reverse" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Reverse</span></a>-engineering <a href="https://c.im/tags/Vintagecomputing" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Vintagecomputing</span></a> <a href="https://c.im/tags/hardwarehacking" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>hardwarehacking</span></a> <a href="https://c.im/tags/retrocomputing" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>retrocomputing</span></a> <a href="https://c.im/tags/classicgaming" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>classicgaming</span></a> <a href="https://c.im/tags/GamingHistory" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>GamingHistory</span></a> <a href="https://c.im/tags/crowdfunding" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>crowdfunding</span></a> <a href="https://c.im/tags/Gameconsoles" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Gameconsoles</span></a> <a href="https://c.im/tags/PlayStation" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>PlayStation</span></a> <a href="https://c.im/tags/retrogaming" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>retrogaming</span></a> <a href="https://c.im/tags/opensource" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>opensource</span></a> <a href="https://c.im/tags/PCBdesign" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>PCBdesign</span></a> <a href="https://c.im/tags/retrotech" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>retrotech</span></a> <a href="https://c.im/tags/Gaming" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Gaming</span></a> <a href="https://c.im/tags/gaming" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>gaming</span></a> <a href="https://c.im/tags/Sony" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Sony</span></a></p>
Søren Kjærsgaard<p>I needed a bit of distraction, so why not go ahead with the bi-yearly gear power-up 🙂</p><p>So today is the day where you power up your precious instruments you don’t use too often, thereby preserving the capacitors in power supplies, analogue circuitry, etc. </p><p>It doesn’t take long, an hour will do it 🙂⏰</p><p><a href="https://techhub.social/tags/electronicsengineering" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>electronicsengineering</span></a> <a href="https://techhub.social/tags/rfengineer" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>rfengineer</span></a> <a href="https://techhub.social/tags/hamradio" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>hamradio</span></a> <a href="https://techhub.social/tags/hamr" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>hamr</span></a> <a href="https://techhub.social/tags/testandmeasurement" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>testandmeasurement</span></a></p>
Søren Kjærsgaard<p>Yesterday was <a href="https://techhub.social/tags/worldmetrologyday" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>worldmetrologyday</span></a> and thus, a perfect occasion to do the monthly statistical readout of my four 10V references, based on the popular LM399. </p><p>Two of them arrived January 15 and has been powered since. A couple of months later, March 22, I added two more. The idea is, that the standard deviation (noise) of the 10V output should improve with time, lots of time 😂</p><p>Well, that is in fact what I see. Three of them are now at 1.15uV, 1.17uV and 1.45uV. <br>The fourth however, started out really high, 81uV 😳, but has since improved to 29uV in just two months. </p><p>I plan to keep doing this, - Let’s see what the rest of the year brings 🙂🙂</p><p>Long term plan: a 10V calibration transfer 👍🏼</p><p><a href="https://techhub.social/tags/testandmeasurement" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>testandmeasurement</span></a> <a href="https://techhub.social/tags/engineer" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>engineer</span></a> <a href="https://techhub.social/tags/electronicsengineering" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>electronicsengineering</span></a> <a href="https://techhub.social/tags/electronics" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>electronics</span></a></p>
Søren Kjærsgaard<p>Powering up a blue laser diode to 500mW 🙂<br>Note how it acts like a poor LED until 150mA, at which point the laser process fires 🔥 </p><p>The 505B is an accurate, adjustable current source which allows for external modulation input. </p><p>It’s designed for low-noise (<1.5uA RMS) and it has a photo diode input, so with a calibrated light sensor, you can achieve constant power regulation.</p><p>Last but not least: it’s designed for maximum safety with two interlock circuits, one with a physical key.<br>Its internal design has a complex redundant output circuit, which ensures that the laser will NEVER illuminate unintended and it will NEVER exceed the chosen power setting. </p><p>A fancy current source indeed, a laboratory grade instrument 🙂</p><p>This video was shot wearing the appropriate safety glasses, be VERY CAREFUL when experimenting with lasers. Even a short duration reflection at this power level WILL damage your vision 🚨‼️</p><p><a href="https://techhub.social/tags/electronicsengineering" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>electronicsengineering</span></a> <a href="https://techhub.social/tags/electronics" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>electronics</span></a> <a href="https://techhub.social/tags/physics" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>physics</span></a> <a href="https://techhub.social/tags/stem" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>stem</span></a> <a href="https://techhub.social/tags/laserfun" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>laserfun</span></a> <a href="https://techhub.social/tags/funwithlasers" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>funwithlasers</span></a> <a href="https://techhub.social/tags/ee" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>ee</span></a> <a href="https://techhub.social/tags/testandmeasurement" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>testandmeasurement</span></a></p>
Søren Kjærsgaard<p>Got my hands on this little gem recently, they’re hard to find in a decent state at a decent price tag. Got lucky though so now I have a dedicated laser diode driver in my lab 🤩 <br>Not super high power, it maxes out at 500mA, but it’s enough for a whole range of experiments and it has a lot of nice safety and control features 🙂<br>It’s surprisingly complex inside, but nicely built and very clean. Doubt it’s seen many hours usage, the fan is just fine 👍🏼<br><a href="https://techhub.social/tags/electronicsengineering" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>electronicsengineering</span></a> <a href="https://techhub.social/tags/laser" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>laser</span></a> <a href="https://techhub.social/tags/testandmeasurement" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>testandmeasurement</span></a></p>
Søren Kjærsgaard<p>Adding parallel circuit allows for the Lambda Diode to oscillate at a frequency determined by the LC resonance frequency. The result is an absolutely beautiful sine wave 🤩</p><p>Note how the oscillation starts, once the supply voltage crosses where the current starts to decrease, ending up at the ‘negative resistance’ portion of its characteristic. </p><p>This is likely the easiest and most clean oscillator I ever built 😃 I wonder if you can use a crystal or crystal f it would get damaged from the drive level 🤔<br>Maybe one of those vintage ones.. </p><p><span class="h-card" translate="no"><a href="https://mastodon.radio/@va3db" class="u-url mention" rel="nofollow noopener" target="_blank">@<span>va3db</span></a></span></p><p><a href="https://techhub.social/tags/signalsaturday" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>signalsaturday</span></a> <a href="https://techhub.social/tags/electronics" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>electronics</span></a> <a href="https://techhub.social/tags/rfengineer" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>rfengineer</span></a> <a href="https://techhub.social/tags/testandmeasurement" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>testandmeasurement</span></a> <a href="https://techhub.social/tags/hamr" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>hamr</span></a> <a href="https://techhub.social/tags/hamradio" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>hamradio</span></a> <a href="https://techhub.social/tags/electronicsengineering" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>electronicsengineering</span></a> <a href="https://techhub.social/tags/siglent" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>siglent</span></a></p>
Søren Kjærsgaard<p>Stumbled across an article describing the ‘ADALINE’ <a href="https://techhub.social/tags/perceptron" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>perceptron</span></a> emulator, an analogue circuit, made entirely by a resistor and potentiometer network.</p><p>Being from the early 60’s, there’s not much information to be found these days on the device, but I managed to build it pretty much the way it was - at least I think so 😎👍🏼</p><p>It’s quite fun to train and test with different patterns - units like these are the vintage foundation of modern neural networks, AI and language models. </p><p><a href="https://techhub.social/tags/LLM" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>LLM</span></a> <a href="https://techhub.social/tags/AI" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>AI</span></a> <a href="https://techhub.social/tags/neuralnetworks" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>neuralnetworks</span></a> <a href="https://techhub.social/tags/electronics" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>electronics</span></a> <a href="https://techhub.social/tags/electronicsengineering" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>electronicsengineering</span></a> <a href="https://techhub.social/tags/testandmeasurement" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>testandmeasurement</span></a></p>
Tom Gambill<p>Baby steps in getting my Apple I reproduction PCB up and running. 6502 CPU booting with just RAM and ROM attached. It grabs the reset address from ROM and starts executing code...until it tries to do something with IO, which is not attached yet...</p><p>I'm monitoring the bus with an Arduino MEGA attached to my MacBook Pro.</p><p><a href="https://techhub.social/tags/cpudesign" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>cpudesign</span></a> <a href="https://techhub.social/tags/retrodev" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>retrodev</span></a> <a href="https://techhub.social/tags/8bit" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>8bit</span></a> <a href="https://techhub.social/tags/16bit" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>16bit</span></a> <a href="https://techhub.social/tags/100DaysRTL" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>100DaysRTL</span></a> <a href="https://techhub.social/tags/DigitalDesign" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>DigitalDesign</span></a> <a href="https://techhub.social/tags/ElectronicsEngineering" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>ElectronicsEngineering</span></a> <a href="https://techhub.social/tags/TechInnovation" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>TechInnovation</span></a> <a href="https://techhub.social/tags/hardwaredesign" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>hardwaredesign</span></a> <a href="https://techhub.social/tags/PCBDesign" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>PCBDesign</span></a> <a href="https://techhub.social/tags/RetroDev" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>RetroDev</span></a> <a href="https://techhub.social/tags/KiCad" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>KiCad</span></a> <a href="https://techhub.social/tags/DIYProjects" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>DIYProjects</span></a> <a href="https://techhub.social/tags/retrocomputer" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>retrocomputer</span></a></p>
Søren Kjærsgaard<p>So when you have a bunch of jellybean JFETs (2N5457), time to burn, and a handful of 1uF bipolar capacitors… <br>What to do.. 🤷🏼♂️🤓</p><p>I decided to build a simple amplifier 😃 Although many find JFETs aren’t quite as intuitive as a regular BJTs, they’re not THAT scary 👻😂 and they’re easily biased, using a megaohm sized resistor from the gate to ground. </p><p>To be able to do some more accurate calculations, I decided to measure the maximum drain current, IDSS, and the negative Gate-Source cut-off (pinch off) voltage, as they can vary significantly even between devices even from the same batch. </p><p>A fun evening in the lab 😃</p><p><a href="https://techhub.social/tags/electronics" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>electronics</span></a> <a href="https://techhub.social/tags/rfengineer" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>rfengineer</span></a> <a href="https://techhub.social/tags/electronicsengineering" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>electronicsengineering</span></a> <a href="https://techhub.social/tags/EE" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>EE</span></a> <a href="https://techhub.social/tags/testandmeasurement" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>testandmeasurement</span></a> <a href="https://techhub.social/tags/hamradio" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>hamradio</span></a> <a href="https://techhub.social/tags/hamr" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>hamr</span></a></p>
OpenSourceQT adapter for Sensirion SEN6x Sensirion just came out with the new SEN6x series of ‘everything...<br><br><a href="https://blog.adafruit.com/2025/03/10/qt-adapter-for-sensirion-sen6x/" rel="nofollow noopener" target="_blank">https://blog.adafruit.com/2025/03/10/qt-adapter-for-sensirion-sen6x/</a><br><br><a rel="nofollow noopener" class="mention hashtag" href="https://mastodon.social/tags/Breakout" target="_blank">#Breakout</a> <a rel="nofollow noopener" class="mention hashtag" href="https://mastodon.social/tags/Boards" target="_blank">#Boards</a> <a rel="nofollow noopener" class="mention hashtag" href="https://mastodon.social/tags/Adafruit" target="_blank">#Adafruit</a> <a rel="nofollow noopener" class="mention hashtag" href="https://mastodon.social/tags/arduino" target="_blank">#arduino</a> <a rel="nofollow noopener" class="mention hashtag" href="https://mastodon.social/tags/breakoutboard" target="_blank">#breakoutboard</a> <a rel="nofollow noopener" class="mention hashtag" href="https://mastodon.social/tags/comingsoon" target="_blank">#comingsoon</a> <a rel="nofollow noopener" class="mention hashtag" href="https://mastodon.social/tags/devboard" target="_blank">#devboard</a> <a rel="nofollow noopener" class="mention hashtag" href="https://mastodon.social/tags/digikey" target="_blank">#digikey</a> <a rel="nofollow noopener" class="mention hashtag" href="https://mastodon.social/tags/diytech" target="_blank">#diytech</a> <a rel="nofollow noopener" class="mention hashtag" href="https://mastodon.social/tags/electronics" target="_blank">#electronics</a> <a rel="nofollow noopener" class="mention hashtag" href="https://mastodon.social/tags/electronicsengineering" target="_blank">#electronicsengineering</a><br><br><a href="https://awakari.com/pub-msg.html?id=0tYIskHzJvjfhFyKvhj7x9ZTevg" rel="nofollow noopener" target="_blank">Event Attributes</a>
OpenSourceQT adapter for Sensirion SEN6x Sensirion just came out with the new SEN6x series of ‘everything...<br><br><a href="https://blog.adafruit.com/2025/03/10/qt-adapter-for-sensirion-sen6x/" rel="nofollow noopener" target="_blank">https://blog.adafruit.com/2025/03/10/qt-adapter-for-sensirion-sen6x/</a><br><br><a rel="nofollow noopener" class="mention hashtag" href="https://mastodon.social/tags/Breakout" target="_blank">#Breakout</a> <a rel="nofollow noopener" class="mention hashtag" href="https://mastodon.social/tags/Boards" target="_blank">#Boards</a> <a rel="nofollow noopener" class="mention hashtag" href="https://mastodon.social/tags/Adafruit" target="_blank">#Adafruit</a> <a rel="nofollow noopener" class="mention hashtag" href="https://mastodon.social/tags/arduino" target="_blank">#arduino</a> <a rel="nofollow noopener" class="mention hashtag" href="https://mastodon.social/tags/breakoutboard" target="_blank">#breakoutboard</a> <a rel="nofollow noopener" class="mention hashtag" href="https://mastodon.social/tags/comingsoon" target="_blank">#comingsoon</a> <a rel="nofollow noopener" class="mention hashtag" href="https://mastodon.social/tags/devboard" target="_blank">#devboard</a> <a rel="nofollow noopener" class="mention hashtag" href="https://mastodon.social/tags/digikey" target="_blank">#digikey</a> <a rel="nofollow noopener" class="mention hashtag" href="https://mastodon.social/tags/diytech" target="_blank">#diytech</a> <a rel="nofollow noopener" class="mention hashtag" href="https://mastodon.social/tags/electronics" target="_blank">#electronics</a> <a rel="nofollow noopener" class="mention hashtag" href="https://mastodon.social/tags/electronicsengineering" target="_blank">#electronicsengineering</a><br><br><a href="https://awakari.com/pub-msg.html?id=D4X2sBUuODQ5qHeahasYN9PtSs4" rel="nofollow noopener" target="_blank">Event Attributes</a>
Marcus Jenkins<p>As somebody who suffered the torture of the maths part of an Electronics Engineering degree, I can honestly say this is the only time a Laplace Transform has made me smile.</p><p><a href="https://mastodon.social/tags/electronicsengineering" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>electronicsengineering</span></a> <a href="https://mastodon.social/tags/calculus" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>calculus</span></a> <a href="https://mastodon.social/tags/LaplaceTransforms" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>LaplaceTransforms</span></a> <a href="https://mastodon.social/tags/engineeringjokes" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>engineeringjokes</span></a></p>
Søren Kjærsgaard<p>This weekend was special: yesterday the baltic countries: Estonia, Lithuania and Latvia, disconnected from the Russian/Belarus 50Hz power grid, going ‘island mode’, controlling the 50Hz grid frequency themselves. </p><p>After more than a day of different stability tests, this afternoon, just before 13:00 CET, a connection to the European grid was established via Poland, so now the the three countries are in 50Hz sync with Europe. </p><p>I observed a small, undramatic, ‘burp’ in the frequency at the time of the event, and my wall socket is now in full sync with the measurement in Estonia, provided by <a href="https://techhub.social/tags/sympower" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>sympower</span></a>⚡️ 😃👌🏼</p><p><a href="https://techhub.social/tags/gridtech" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>gridtech</span></a> <a href="https://techhub.social/tags/powerdistribution" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>powerdistribution</span></a> <a href="https://techhub.social/tags/electronicsengineering" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>electronicsengineering</span></a> <a href="https://techhub.social/tags/testandmeasurement" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>testandmeasurement</span></a></p>
Søren Kjærsgaard<p>I need a reasonably clean 4MHz oscillator for a <a href="https://techhub.social/tags/hamradio" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>hamradio</span></a> <a href="https://techhub.social/tags/foxhunt" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>foxhunt</span></a> offset attenuator and decided to build one based on a J310 J-FET transistor. </p><p>The output on the Drain is quite clean, but can’t be loaded much, so a I added a simple buffer based on BC547B 🙂</p><p>It’s all pretty standard circuitry, and you can find all kinds of variants out there, but it’s still fun to see it spring to life 😃</p><p><a href="https://techhub.social/tags/hamr" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>hamr</span></a> <a href="https://techhub.social/tags/testandmeasurement" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>testandmeasurement</span></a> <a href="https://techhub.social/tags/rfengineer" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>rfengineer</span></a> <a href="https://techhub.social/tags/electronicsengineering" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>electronicsengineering</span></a> <a href="https://techhub.social/tags/siglent" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>siglent</span></a></p>
Chi ha ucciso Il Conte?<p>Back to work on project Chowndolo! Improving the PCB design and making refinements using KiCad. Excited to take this to the next level...<br><a href="https://c.im/tags/PCBDesign" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>PCBDesign</span></a> <a href="https://c.im/tags/KiCad" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>KiCad</span></a> <a href="https://c.im/tags/OpenSourceHardware" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>OpenSourceHardware</span></a> <a href="https://c.im/tags/Electronics" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Electronics</span></a> <a href="https://c.im/tags/Engineering" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Engineering</span></a> <a href="https://c.im/tags/HardwareDesign" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>HardwareDesign</span></a> <a href="https://c.im/tags/Maker" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Maker</span></a> <a href="https://c.im/tags/DIYTech" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>DIYTech</span></a> <a href="https://c.im/tags/EmbeddedSystems" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>EmbeddedSystems</span></a> <a href="https://c.im/tags/CircuitDesign" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>CircuitDesign</span></a> <a href="https://c.im/tags/TechInnovation" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>TechInnovation</span></a> <a href="https://c.im/tags/ProductDevelopment" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>ProductDevelopment</span></a> <a href="https://c.im/tags/EDA" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>EDA</span></a> <a href="https://c.im/tags/SchematicDesign" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>SchematicDesign</span></a> <a href="https://c.im/tags/Prototype" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Prototype</span></a> <a href="https://c.im/tags/IoT" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>IoT</span></a> <a href="https://c.im/tags/DIYEngineering" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>DIYEngineering</span></a> <a href="https://c.im/tags/ElectronicsEngineering" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>ElectronicsEngineering</span></a> <a href="https://c.im/tags/SoundArt" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>SoundArt</span></a> <a href="https://c.im/tags/DigitalLutherie" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>DigitalLutherie</span></a> <a href="https://c.im/tags/MusicTech" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>MusicTech</span></a> <a href="https://c.im/tags/ExperimentalSound" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>ExperimentalSound</span></a> <a href="https://c.im/tags/DIYInstruments" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>DIYInstruments</span></a> <a href="https://c.im/tags/ElectronicMusic" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>ElectronicMusic</span></a> <a href="https://c.im/tags/InteractiveSound" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>InteractiveSound</span></a></p>
Søren Kjærsgaard<p>My first <a href="https://techhub.social/tags/HB9CV" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>HB9CV</span></a> <a href="https://techhub.social/tags/antenna" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>antenna</span></a>, believe it or not, made from 5mm brake lines and a foot of 15mm copper pipe 🙂</p><p>I need it for a 70cm radio <a href="https://techhub.social/tags/foxhunt" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>foxhunt</span></a> event in a couple days - looked different places for design guidelines, some of them came up with quite different results 🤷🏼♂️🤨</p><p>Decided to just have go at it, based on a combination of what I could find in the legendary <a href="https://techhub.social/tags/Rothammel" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Rothammel</span></a> antenna book and some online sources and it turned out quite well 😃</p><p>Resonance is a bit low, 431MHz, but it’ll do fine as a direction finding device: what I really want is the characteristic kidney shaped radiation pattern, allowing me to turn the antenna backwards, looking for a minimum in the received signal. </p><p>Funny to see how the <a href="https://techhub.social/tags/smithchart" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>smithchart</span></a> impedance plot has a distinct turn at the resonance frequency 🤓</p><p><a href="https://techhub.social/tags/rfengineer" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>rfengineer</span></a> <a href="https://techhub.social/tags/hamr" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>hamr</span></a> <a href="https://techhub.social/tags/antennadesign" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>antennadesign</span></a> <a href="https://techhub.social/tags/testandmeasurement" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>testandmeasurement</span></a> <a href="https://techhub.social/tags/electronicsengineering" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>electronicsengineering</span></a></p>
Søren Kjærsgaard<p>Been debating a loooong time whether to get the SV4401A 4.4GHz VNA.. I already have a 4GHz NanoVNA, but the display size, ruggedness and N-connectors on the 4401 is a major upgrade.. </p><p>Well, I took the leap! 😃</p><p>And why not make the first-light ‘Hello, World’ test a fun one ☺️ I came across an AT-741 aircraft IFF transponder antenna and it seems like it still works 🙂</p><p>Still in production by several vendors (fx Harris), the unit I have is old, dated 08/1979. So much more fun to have it sense a bit of RF so many years down the road 👍🏼</p><p><a href="https://techhub.social/tags/rfengineer" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>rfengineer</span></a> <a href="https://techhub.social/tags/hamradio" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>hamradio</span></a> <a href="https://techhub.social/tags/testandmeasurement" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>testandmeasurement</span></a> <a href="https://techhub.social/tags/measurementmonday" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>measurementmonday</span></a> <a href="https://techhub.social/tags/electronics" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>electronics</span></a> <a href="https://techhub.social/tags/electronicsengineering" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>electronicsengineering</span></a></p>
Søren Kjærsgaard<p>Yay! 😀 The 432A power meter works just fine and I managed to scavenge some probes and the needed connection cable - my first calibrated power meter ever 🙂</p><p>What a beautiful addition to my little lab 🥳🎄</p><p>I have more probes and together they cover all the way to 18GHz 👍🏼</p><p><a href="https://techhub.social/tags/hamradio" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>hamradio</span></a> <a href="https://techhub.social/tags/hamr" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>hamr</span></a> <a href="https://techhub.social/tags/rfengineer" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>rfengineer</span></a> <a href="https://techhub.social/tags/testandmeasurement" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>testandmeasurement</span></a> <a href="https://techhub.social/tags/electronicsengineering" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>electronicsengineering</span></a></p>
Søren Kjærsgaard<p>Occasionally you come across a rescue scenario: it was literally me or the dumpster… So I adopted it, I now have a 20GHz frequency counter… 🤷🏼♂️😎</p><p>The 5361B was never made for normal RF use, its primary application is analysis of pulsed radars. It does, however, fully support CW measurements, so although somewhat bulky, it’s a nice instrument to have around in the lab 🙂</p><p><a href="https://techhub.social/tags/testandmeasurement" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>testandmeasurement</span></a> <a href="https://techhub.social/tags/rfengineer" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>rfengineer</span></a> <a href="https://techhub.social/tags/electronicsengineering" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>electronicsengineering</span></a> <a href="https://techhub.social/tags/hamradio" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>hamradio</span></a> <a href="https://techhub.social/tags/hamr" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>hamr</span></a></p>
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