From Brian Willoughby Sent Fri, Oct 11th 2019, 19:37
From Brian Willoughby Sent Fri, Oct 11th 2019, 19:37
I see several solder joints in those photos that look =E2=80=9Ccold=E2=80=9D= or =E2=80=9Canemic=E2=80=9D but I wouldn=E2=80=99t actually say = they=E2=80=99re the cause of your problems. That said, I did some manual = SMD capacitor replacements on a board that I designed, using soldering = tweezers, and was very surprised that some of them didn=E2=80=99t work = until I reflowed the solder. Unless you=E2=80=99ve already found schematics, this might be an = opportunity to learn reverse engineering. When I was first learning = audio circuits in high school, I manually drew the schematics while = probing the PCB. It=E2=80=99s extremely tedious, but it=E2=80=99s one = way to become intimately familiar with a circuit. My favorite was a = phase shifter guitar pedal that I eventually modified to accept CV in = lieu of its internal LFO - that worked swell with an Envelope Follower. Anyway, Envelope Generators are not terribly complex circuits, so you = might be able to debug this with patience. Brian On Oct 10, 2019, at 9:09 PM, W. James Meagher = <x.xxxxx.xxxxxxx@xxxxx.xxx> wrote: > Looked over every component and can't locate a mistake made there (all = transistors are where and what they should be). Even decoded all the = resistor color bands to make sure all of those values are correct.=20 >=20 > Build pics: > Freq Central ENV build front > Freq Central ENV build back > Freq Central ENV build detail 1 > Freq Central ENV build detail 2 >=20