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Old 15th Jan 2018, 1:29 pm   #13
pcravero
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Join Date: Aug 2009
Location: Torino, Italy
Posts: 47
Default Re: Absolute beginner Q's: sensitivity at lower AC input

That's it, Lawrence. While you spotted them with your experience, I reverse engineered the circuit. I took a color picture, did a bit of photo editing (mainly increasing brightness to save on printer ink and to be able to write on it), printed it out and had fun tracing connections. Probably it is a standard procedure for everyone in here. Markings on orange ones have long gone, so I will trust the diagram. On the other hand I found few resistors of different value that made it harder to reverse engineer connections, but I got the most of it now.

I chopped off the two green guys so that I can use their leads to solder replacements. On the DVM they measure a bit high but I haven't bothered measuring the ESR o leakage. Replacements are on their way from UK to Italy.

I wonder if I should replace the two electrollytics or let the original rebuild. I will measure them in any case since they are easily accessible now.

Paolo
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