Hello everyone,
Two days ago i finished my Aquaboy DX, using v3205's. I had it working perfectly after calibrating, with just a little bit distortion on the repeats. The next day i wanted to see if i could get rid of the distortion. So i plugged it in, without having anything changed at all, and i got only clean signal on output!!
I have probed the signal, as mentioned in the project doc: There is signal on pin 7 of the sa571, ic3(v3205) receives this signal but no longer gives output on pins 3 and 4. I only hear clock-whine on these pins. Calibrating with the trimpots gives no result at all.
The mix pot doesnt receive any signal at all, and the vactrol-led is shining very faint now.
I have been checking over and over, but cant find the problem. All IC's are working, i tested them in my aquaboy rev.2. I only couldnt test the tl062.
D3 is omitted, d1 and d2(8.2v zener) are in place, as it should be.
I really need some help on this one.
I have measured all IC's and transistors:
IC1(LF353):
1) 4.45V
2 4.45
3 4.43
4 0
5 4.43
6 4.43
7 4.45
8 8.9
IC2(sa571):
1) 1.06 9) 1.79
2 1.78 10) 4.79
3 1.78 11) 4.79
4 0 12) 1.78
5 1.79 13) 8.9
6 1.79 14) 1.78
7 2.95 15) 1.78
8 1.79 16) 0.25
IC 3(v3205): IC4(v3205):
1) 0 1) 0
2) 4.1 2) 4.1
3) 3.83 3) 3.77
4) 3.87 4) 3.81
5) 8.24 5) 8.2
6) 4.1 6) 4.11
7) trim CW: 5.7 / CCW: 0 7) CW:4.49 / CCW: 0.04
8) 7.7 8) 7.7
IC5(BL3102):
1) 8.24
2) 4.11
3) 0
4) 4.12
5) 4.33
6) 3.9
7) 3.6
8) 7.7
IC6(TL062)
1) 0.7-8.2
2) 4.0- 5.0
3) 3.6- 4.9
4) 0
5) 3.86- 5.05
6) 3.8- 5
7) 3.8- 5
8) 8.9
Q1: e 3.6
b 2.9
c 8.9
Q2: e 2.3
b 2.8
c 8.9
Q3: e 3.2
b 3.67
c 8.9
Q4: e 2.6
b 3.14
c 8.9
Can some point me in the right direction? I absolutely love this pedal when it works!
Greetings,
Yamyfz
I had a similar problem with mine. I solved it by using an MN3101 for the clock.
Here's the thread:
http://www.madbeanpedals.com/forum/index.php?topic=10638.0
Hopefully you'll get this sorted.
Sent from my GT-I9100 using Tapatalk 2
Thanks for your help. Your case looks very similar indeed. I will certainly try switching the clock to a mn3101 or a v3201. I already tried switching the bl3102 with another one, it didnt help. I hope i only have to switch the clock, resoldering makes a bit of a mess of the board. It still is a bit strange that the bbd's and the clock function well in the aquaboy rev. 2 .
I will let you know if this is the culprit!
Greetings, yamyfz