audioguru Posted February 13, 2011 Report Share Posted February 13, 2011 I seem to be having a problem, I've just finished the second board and while testing, C7 explodes into pieces about a 1 or 2 seconds after I power up, I replaced it and the same thing happened again. The transformer is the same one I use on my other board, so it can't be it.any idea where I can start? as I can test without powering it up?When I powered it up the 2nd time, I had my meter on the output, and it seemed to sit at about 30V.C7 where 10uF 50V electrolytic.ThanksC7 will blow up if its polarity is backwards or if the bridge rectifier is defective or connected wrong and applies AC to the circuit instead of DC. Another person had his C7 blow up when his power supply project was powering a switching power supply circuit.If the project has a load and is oscillating at a fairly high frequency then C7 might blow up. Quote Link to comment Share on other sites More sharing options...
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