SOLVED Flock no sound/led when engaged

Quirkey

Quirkey

Active member
Was excited to finally build this board after collecting the parts. I have the original board without the breakout for the rotary. Bypass works, but no sound or LED when I engage the switch. I saw a recent post with a similar issue so I tried all the things suggested there. The switch is wired with a breakout board. I’m definitely getting 9v through the power to the board and there is connectivity between the center pole and the outside of the rotary. Not sure where to go next for debugging without audio tracing around the schematic?

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OK!

On CD4046BE
1 - 8.1mV
2 - 4.1 mV
3 - 84.2 mV
4 - 5.5 mV
5 - 0
6 - 6.1 mV
7 - 4.5 mV
8 - 0
9 - -36 mV
10 - 10 mV
11 - 0
12 - 11 mV
13 - -36mV
14 - 7mV
15 - 180 mV
16 - 0

CD4024
1 - 4 mV
2 - 0
3 - 24 mV
4 - 35 mV
5 - 22 mV
6 - 24 mV
7 - 0
8 - 0
9 - 26 mV
10 - 0
11 - 0
12 - 0
13 - 0
14 - 0
 
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Quirkey said:
OK!

On CD4046BE
1 - 8.1mV
2 - 4.1 mV
3 - 84.2 mV
4 - 5.5 mV
5 - 0
6 - 6.1 mV
7 - 4.5 mV
8 - 0
9 - -36 mV
10 - 10 mV
11 - 0
12 - 11 mV
13 - -36mV
14 - 7mV
15 - 180 mV
16 - 0

CD4024
1 - 4 mV
2 - 0
3 - 24 mV
4 - 35 mV
5 - 22 mV
6 - 24 mV
7 - 0
8 - 0
9 - 26 mV
10 - 0
11 - 0
12 - 0
13 - 0
14 - 0
Click to expand...
Definite power issues. What’s your power reading at the input and both sides of the 5817 diode?
 
Last edited:
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OK! This was a good lead. Even though I had 9V at the power input there was nothing at the 5817 diode. I ended up jumping a wire from the 9V to the diode and VIOLA. The LED lit up and there was _some_ sound. Bad trace? However, I don't think its the correct sound. I tried twiddling all the knobs but all I'm getting is a single note and then the signal dies out quickly when engaged. So I'm guessing I still have some issue.
 
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Quirkey said:
OK! This was a good lead. Even though I had 9V at the power input there was nothing at the 5817 diode. I ended up jumping a wire from the 9V to the diode and VIOLA. The LED lit up and there was _some_ sound. Bad trace? However, I don't think its the correct sound. I tried twiddling all the knobs but all I'm getting is a single note and then the signal dies out quickly when engaged. So I'm guessing I still have some issue.
Click to expand...
Great, what do your ICs read now?
 
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CD4046
1- ~0
2 - ~0
3 - ~0
4 - 8.8V
5- 0
6 -0
7 - 0
8 -0
9 -0
10 - .6V
11 - 0
12 - 7.6V
13 - 0
14 - 4.5 V
15 - .6V
16 - 8.5V

CD4024
1 - 4.4V
2 - 0
3 - Fluctuating between 2.2 - 4.5 - 5.5 V
4 - Fluctuating between 4.2 - 3.5 V
5 - 3.9 V
6 - 3.9 V
7 - 0
8 - 0
9. 3.9 V
10 - 0
11 - 3.9 V
12 - 3.9V
13 - 0
14 - 7.9 V

Thanks for your help! If there was a schematic somewhere I could probably audio-trace it at least.
 
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Quirkey said:
CD4046
1- ~0
2 - ~0
3 - ~0
4 - 8.8V
5- 0
6 -0
7 - 0
8 -0
9 -0
10 - .6V
11 - 0
12 - 7.6V
13 - 0
14 - 4.5 V
15 - .6V
16 - 8.5V

CD4024
1 - 4.4V
2 - 0
3 - Fluctuating between 2.2 - 4.5 - 5.5 V
4 - Fluctuating between 4.2 - 3.5 V
5 - 3.9 V
6 - 3.9 V
7 - 0
8 - 0
9. 3.9 V
10 - 0
11 - 3.9 V
12 - 3.9V
13 - 0
14 - 7.9 V

Thanks for your help! If there was a schematic somewhere I could probably audio-trace it at least.
Click to expand...
How does the TL072 read?
 
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TL072
1 - 4.45V
2 - 4.45V
3 - 4.45V
4 - 0
5 - 4.5 V
6 - 5.1V
7 - 1.37V
8 - 8.8V

CD4017BE
1 - 0
2 - 0
3 - 8.8V
4 - 0
5 - 0
6 -0
7 -0
8 - 0
9- 0
10 - 0
11 - 0
12 - 8.8V
13- 0
14- 4.4V
15 - 0
16 - 8.8V
 
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OK! Thanks for the schematic @PedalPCB.

I traced around and it seems like the issue might be with the second stage of the op-amp? The first stage is loud and clear, the second stage has a huge drop in volume which may make sense why there's no signal going through the PLL section. I tried replacing some of the biasing resistors and tried different op-amps but to no avail. I'm worried I might have burned out part of the board itself when doing some of the de-soldering. If I bypass the second op-amp (by going C4 -> R14) with a jumper wire I get some sound (basically just an oscillation?) but still no real effect. Debating just getting the newer PCB and starting over ...
 
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Ok! So thanks to @PedalPCB for the new board - I rebuilt it this weekend and finished it up today. At first it had the same problem but realized that there was a bad joint right at the beginning of the circuit that once fixed WHAMMO, the crazy noises commenced. Now to case it up and figure out how to work this crazy thing! 🥰
 
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