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| BrokenYugo:
I don't need no stinking RF signal generator, at least not to peak a 455khz IF strip. |
| tautech:
Nothing clever, special or flashy but knocked together totally from stuff just lying around.... the indispensable dim bulb tester: |
| toli:
Dummy load for audio amplifier testing, and a measurement pre-amplifier for noise/distortion measurement at <100KHz. (more info here: https://tolisdiy.com/2021/03/30/compact-stereo-dummy-load-for-amplifier-testing/) (more info here: https://tolisdiy.com/2021/01/30/audio-measurement-pre-amplifier-part-5-updated-ver1-1/) |
| pcprogrammer:
Not really using it but made a spectrum analyzer for a friend of mine. His hardware is a bit more robust and powered from a separate power supply. For development I used this. It runs on a STM32F103 and loads the data via usb to the computer. The ADC is 16bits 100Ksmps. (ADS8321) It sits on the module on the high legs. This is part of some radar equipment my friend had a bunch of lying around. On the computer it works within a browser. Needs a special usb driver under linux to run it, to be able to go full speed. Also made a scope based on it. Other screen captures are on my laptop which is parked out of the way since I bought a new PC. Still planning on improvements, but other projects came by and there is not enough time to do them all :palm: (The FNIRSI-1013d reversal, which is a possible prelude for a follow up of the analyzer) |
| Andrew_Debbie:
AMB labs σ22 +/- 30VDC low-impediance low-noise linear power supply. I bought the main PCB from AMB. https://www.amb.org/audio/sigma22/ I just finished it today. Ripple is below what I can measure with my cheap bench DMM. I guess I need a better meter. I started this project in 2016! Front and Rear panels with FrontPanelDesigner and fabricated by Schaffer AG. The Bulgin momentary switch on the front panel connects to my debounce / latch / relay driver board. That connects to an off-board 5A crydom zero-crossing relay. The relay driver board also has a high temperature shut down, which turns on the fault LED. The σ22 board has no current limiting or thermal limits. The only other protection is the line fuse. (fuses on both L and N for safety) |
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