effects of faulty lm78xx? - Page 2 - diyAudio
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Old 13th September 2013, 11:08 AM   #11
diyAudio Member
Join Date: Sep 2009
Location: seoul
weird. i tried different caps, new reg, rerouted grounding and nothing seemed to work until i decided to use pin 1,2 of the hex inverter instead of 12,13 which i had been using because of my terrible layout.
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Old 13th September 2013, 11:42 AM   #12
diyAudio Member
Join Date: Sep 2009
Location: seoul
never mind. the problem reappeared after an hour. could even the smoothing cap cause this? i'm using salas shunt with once again, recycled caps.
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Old 13th September 2013, 01:44 PM   #13
diyAudio Member
Join Date: Sep 2009
Location: seoul
when the distortion starts, i can kill it by changing the value of the variable resistor for lm317 that feeds the te7022 usb module. so it's not the hex inverter where the distortion is from. my grounding scheme is a mess. i will try to star ground everything. do you think it might be parasitic oscillation?
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