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shapirus:
This is a voltage reference based on a well-known Chinese "LM399" module which actually appears to be staying pretty stable over time. How precise the numbers that are hand-written on it are is quiestionable, but they appear good enough and they can always be verified when there's a chance to use a precision voltmeter. Most importantly, it can definitely be used to check if the DMMs are still all right, which is its primary job.

Inside is a linear power supply and mode selection circuitry that uses relay contacts where a jumper was used on the module's pin header to select one of the six output voltages.





Usage:




And this one's used literally every time I need to try something out on a breadboard or quickly power something up otherwise.
Nothing fancy, just an isolated transformer -> bridge -> caps -> one of those well-known Chinese DC/DC modules.

jonpaul:
Unearthed in the  # 3 archive, covered in dirt , unused in 30 years.

1980s DIY 3 wide Tektronix plugin TM500 tester PSU, like TM503 but no cage or rails just the PSU.

NPN/PNP on floating HS,  56 pin  genuine AMP card edge connectors are gold plated and spring floating.

Your thoughts appreciated!



Jon
jasonRF:

--- Quote from: DavidAzulay5000 on January 29, 2023, 06:06:48 pm ---I bought most of the my equipment broken .
i repaired and calibrated it
I enjoy it the most
to repair measuring equipment

--- End quote ---
:-+
tomud:
My old case design for Chinese 150W Constant Current Electronic Load 60V 10A

3D Printing Case Design: https://www.thingiverse.com/thing:4328521

rfclown:
Rubidium 10 MHz.
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