Quoted from debaser:Any ideas?
Broken through-hole at C9? Unless you are measuring your regulator input across C9, you are getting a false reading on the true voltage differential into the regulator.
(Topic ID: 251382)
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I gave you some bad information here as there is no way you are reading a short across the input filter cap and NOT blowing a fuse! I forgot that there is an error in my WPC schematics and that C9 is an output filter for Q1. The LM323 has over current protection and will shutdown with a short across the output which you apparently have...now you just need to find it.
FWIW: my board reads 2.2K ohms across C9 with no connections to the board, and +5.00 VDC across it when in operation.
pasted_image (resized).pngQuoted from debaser:This is a TwoBits MPU board and it looks like those two screws that have the washers with teeth on them are touching the 5v line when they are screwed in tight.
That will do it everytime, glad you got it figured out; this is a know problem with the TwoBits CPU board, most use nylon washers on the top side to prevent this from happening.
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