Improving my test bench for future projects, I wrote a small PyQt5 GUI to control my Siglent SDG2042X from a remote Ubuntu desktop.

It handles basic waveform setup, sweeps, bursts, presets (so you can adjust at the generator and than load down for later), ARB upload/download (not fully tested yet), and SCPI commands, also screenshots.

I’m more of a hardware guy than a coder (for sure there will be some bugs), so feedback are welcome. Fork if you like.

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Blog:
https://togo-lab.io/?p=130

Gitea with script:
https://gitea.togo-lab.io/tgohle/0003-SDG2042X-PyQt-GUI-for-Linux

#ToGoLab #Siglent #SDG2042X #PyQt5 #Testbench #OpenSource #python #weekendProject #diy_electronics #DIY

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 🤩

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.

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 🤔
Maybe one of those vintage ones..

@va3db

#signalsaturday #electronics #rfengineer #testandmeasurement #hamr #hamradio #electronicsengineering #siglent

I need a reasonably clean 4MHz oscillator for a #hamradio #foxhunt offset attenuator and decided to build one based on a J310 J-FET transistor.

The output on the Drain is quite clean, but can’t be loaded much, so a I added a simple buffer based on BC547B 🙂

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 😃

#hamr #testandmeasurement #rfengineer #electronicsengineering #siglent

Happy Camper!

#siglent #oscilloscope

Hmmm, what could this be…!!??

#siglent #siglentoscilloscopes #oscilloscope #retrocomputer

The Icom IC-7000 I recently purchased is quite old and they’re known for having a bit of high frequency ‘hiss’ in the audio output.

I doesn’t matter while using the built-in speaker, however it gets annoying when using high quality headphones. There is a fix, but it’s complicated and involves extracting a major PCB from the radio.

I had some random two-way speaker filter in a drawer so decided to give it a go at reworking it, to become a 700Hz lowpass filter (I’m primarily a CW operator).

It turned out really nice, even peaks a bit before rolling off.

And the ‘hiss’ from the radio? Gone! 👍🏼😃

#hamradio #hamr #icom #icom7000 #siglent #electronicsengineering #signalsaturday

Oh cool! The #Siglent SDS1104X-E scope's Bode plot feature doesn't require the AWG hardware add-on (SAG1021I), it can make use of a function generator over LAN. At least it seems to work well with the SDG-2042X. #electronics

Here's a plot of a simple high-pass filter on a breadboard.

It’s #measurementmonday and I’m investigating a mystery coupler, a fellow ham asked me to test.
It seems to be the happiest around 1.8-1.9GHz 🤷🏼‍♂️🙂
The coupled ports are -20dB down.

What’s even more interesting, is the detector diode add-on it came with: you carefully insert the diode, a 1N21E replica, directly into the center pin of the N-connector 😳 Then carefully mount the outer capacitor shell with the BNC connector and you’re good to go.

Since the diode now sits in its reversed position, the output will be negative and it works just fine 👍🏼🙂

#testandmeasurement #hamr #hamradio #rfengineer #electronics #siglent #rfengineering