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| MrYakimovYA:
Test fixture (Faraday cage) for electrometry stuff. I can measure high resistance (100 Meg with HP 34401a for example, and higher), leakage current ans son on. This boix is also intended for my picoammeter. P.S. D-Link hub is a very important for such measurements :-DD |
| MrYakimovYA:
--- Quote from: dobsonr741 on January 17, 2023, 01:48:39 am ---DDS function generator based on AD9833, VCA822, TLV5618, Raspberry Pi Pico. Controllable by SCPI and a UI, has a bonus +/-3V programmable voltage source with 12 bit resolution. Attenuator down to -60dB. --- End quote --- Nice generator! I like it! |
| HarryDoPECC:
I'm entering in the "Essential to Me but Unlikely to be Useful to Anyone Else, Anywhere" category Wang 300 Series Keyboard Tester Before opening the logic case to chase a non-existent fault among four hundred transistors and 1k diodes, all 60 years old, it's a good idea to make sure that the ancient transistors and diodes in the keyboard and display are not the problem. Wang 300 Series Core Select/Drive Tester Setting up the MSO to check that the right half-selects are being activated onto the core plane is tedious and it's useful to be able to check that the decoding logic is working and that the drive currents are about right. The half selects flash past, Lord Knows how they did this in the day with 2 channels, 1 trigger and no storage..... |
| fourfathom:
--- Quote from: HarryDoPECC on January 17, 2023, 05:30:24 am ---the "Essential to Me but Unlikely to be Useful to Anyone Else, Anywhere" category --- End quote --- Yeah, I know what you mean! It's fun though, isn't it? |
| JimKnopf:
I use a selfmade resistor decade from time to time. I once bought one from a well known chinese selling platform that looked like it was from Mao era. It was too big and not accurate enough for my purposes. I built it from 9 (later one with 10) thumb wheels. One with old-style resistors and one with SMD resistors. I also like to use the Retro-Chip-Tester (RCT). A do-it-yourself project. You can buy the pcb at 8bit-museum.de. The other components you have to get yourself. You can eventest and burn very old chips with it. |
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