Hi to all!
Here I am again. In the latest episodes I had problems mainly caused by "fake chips" etc... this time the situation is different (I think).
I built a naughty fish using the suggested components. For the Vactrol I used the Xvive replica as wrote.
The situation is this:
The pedal works but no envelope at all. I tried the lp/hp/bp switch and the audio change, same thing with lo-hi. The up/down switch seems to do nothing (no sonic changes), the gain works and the peak change almost nothing (I assume it works because at o position the sound changes a bit).
I saw that the top led (which indicates the envelope situation) is always off, it turns on and stay always on when i move the range switch to the right (RANGE UP). If I play etc (at all gain settings) when it is off it remains off and when it is on it remains on.
I also noticed a lot of volume boost when the gain pot is turned right.
Don't know how it is possibile. I double check'd the soldering points etc but no issue.
For C4 I used a nichion muse capacitor (non polarized) but I don't think this is the problem.
The Measurement I made are those:
IC1:
Pin1 2.5mv
Pin2 2.5mv
Pin3 0.2mv
Pin4 -8.98
Pin5 2.8mv
Pin6 6mv
Pin7 6mv
Pin8 9.44
IC2LEFT:
Pin1 .64
Pin2 3.3mv
Pin3 0.1mv
Pin4 -8.94
Pin5 -6.32
Pin6 -4,94
Pin7 -6,82
Pin8 9,45
IC2RIGHT:
Pin1 1,11
Pin2 3,2mv
Pin3 0,1mv
Pin4 -8,98
Pin5 3,73
Pin6 .38
Pin7 7.84
Pin8 9,44
IC3:
Pin1 4mv
Pin2 6,3mv
Pin3 0,2mv
Pin4 -8,98
Pin5 0,3mv
Pin6 4,1mv
Pin7 5,8mv
Pin8 9,44v
IC4:
Pin1 1,39
Pin2 5,11
Pin3 0,4mv
Pin4 -4,06
Pin5 -8,98
Pin6 2,57
Pin7 1,45
Pin8 9,44
VACT1
Led- 6,10
Led+ 7,84
photores up 6,3mv
Photores down 6,3mv
VACT2
Led- 6,11
Led+ 7,84
photores up 4,1mv
Photores down 4,1 mv
Here's some shots:
(https://i.ibb.co/NrFCgsj/IMG-0215.jpg) (https://ibb.co/T1w2Dk8)
(https://i.ibb.co/gFSwLgh/IMG-0216.jpg) (https://ibb.co/jZyGP4s)
(the pots aren't touching the pcb/I removed the insulation to taking some shots)
Any ideas?
Thanks
First Update,
I double checked everything... I found that r16 and r22 are 330K instead of 330ohm (received wrong resistors). I'll take a look if I have some right resistor and I'll update you
You found the problem.
330k are too large.
In my naughty fish I used 1k2 for R16 and I think is a value near the limit here.
Quote from: SirEgno on October 14, 2019, 12:18:48 PM
You found the problem.
330k are too large.
In my naughty fish I used 1k2 for R16 and I think is a value near the limit here.
Made a try...and now all works! Even this time ... problem caused by a wrong component!
Next time I'll pay more attention even if the part is inside a bag with labeled value etc...
Thanks to all!
I always measure every resistor and cap with the DMM before soldering. I am not in hurry, I hate debugging, I don't trust suppliers to not make errors, and I am too colour blind to read resistor codes. ;D
Quote from: WormBoy on October 14, 2019, 04:54:12 PM
I always measure every resistor and cap with the DMM before soldering. I am not in hurry, I hate debugging, I don't trust suppliers to not make errors, and I am too colour blind to read resistor codes. ;D
You're right, I must do the same when I built something...
I found that the resistor was wrong because I see too much orange... ::)