Twin face puzzle

[comradehoser]

On a first fire-up building streak, and making this one for my brother in law, the streak abruptly ended

Built everything to spec as far as i know except the 20uf caps (used 22uf). Have a barely audible signal. The issue i think is the DC is blocked. Only have fractional voltages after the 5817 (including to pins 1 and 8 of the charge pump, the resistors after D1, and all transistor legs) which i noticed immediately while going to trim the transistor bias before fire up.

Reflowed all points, rechecked wiring, continuity (including socket to board), components and cap orientations. Subbed the 1044scpa, tried different transistors, same deal.

At this point, I'm kind of stumped as nothing is coming up for me in the components or soldering. Bad trace after the schottky is all i can think of.

But maybe you all can see something i can't.

Gutshots

 

[fig]

I’m having the exact same issues with my two twin face boards , Npn works sounds fuzzy but flick the switch and nothing happens

I'd suggest starting a new TS thread.

 

[swelchy]

I had a twin face board in my pile of boards and actually ran into these exact same issues after boxing it up.. the silicon side works but not the germanium side.... Confirmed my transistors were good..... I put it in my pile of " I'll fool with this later" and went on to building other pedals that wrork...lol

 

[comradehoser]

I think I may have narrowed down the list of likely causes for things going wrong to a problematic practice on my part: I used to "tack" one pin of an in-line socket section to a "close-enough" position, and then bend it to align more precisely. I think that practice may have lifted some pads or bolloxed some connections, as most of my issues with pedals were solved with jumpering to the IC pads. Now, I still tack, but I move the socket while hitting the tack joint with heat so it's mobile and floating.

I don't know if that really explains everything, but my pedal works and I gave it to my brother-in-law. I went with some Soviet PNP germaniums, and some MPSA18 or PN2222A for the silicons, as I didn't have time to reorder the BCs as originally specced.