| Products > Test Equipment |
| Show the homemade equipment you are using now. |
| << < (17/22) > >> |
| 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. |
| Navigation |
| Message Index |
| Next page |
| Previous page |