rebote 2.5 debug, please!

[jlullo]

Hey guys....

i'm having problems with my Rebote 2.5 (tonepad) delay.  The effect will have bypassed guitar, but no sound when engaged.  I used all stock parts, except for a 243k resistor in place of a 240k, and a 511k resistor in place of a 510k.  All of the IC's are oriented correctly, as well as the voltage regulator and the electros.  I used a 78l05 voltage regulator from smallbear.

1. out of circuit battery voltage is 8.83v

Voltage at the circuit board end of the red battery lead = 8.55
Voltage at the circuit board end of the black battery lead = 0

IC1 (pt2399)
1 - 5.02
2 - 2.51
3 - 0.01
4 - 0.01
5 - 1.16
6 - 2.35
7 - 0.83
8 - 0.83
9 - 2.50
10 - 2.51
11 - 2.51
12 - 2.51
13 - 2.50
14 - 2.50
15 -2.51
16 - 2.51

IC2 (TL072)
1 - 4.23
2 - 4.23
3 - 4.23
4 - 0
5 - 4.12
6 - 4.22
7 - 4.22
8 - 8.45

IC3 (78L05 voltage regulator)
OUT - 5.02
GROUND - 0
In - 8.45

could someone please help me with this?  i've compared my voltages to others (by searching), and they seem to be quite similar

thank you!

jonathan

[jlullo]

i'd also like to add that before i took these voltages, i had the switch wired up a different way, and the voltage regulator got very hot... then i noticed my error, rewired the switch, and now the regulator doesn't get hot.  I'm assuming there is a high likelihood that i fried the pt2399.. i just built an audio probe tonight.... i read in another post to probe pin 12 of the pt2399, set the pot for long delay, and that i should hear a delay sound.  If so, that means that the chip is good... if not, does that mean the chip is toast?

[Auke Haarsma]

just track the signal path from start to end, you'll find out where the signal gets lost. I don't have my voltages at hand, but I don't think you're pt2399 is fried. I guess there's a cold solder joint somewhere. Gl!

[jlullo]

pong,
you were right...   there were two!  it works great now...

thank you very much!


jonathan

[Auke Haarsma]

You're welcome Jonathan. Great to hear you solved the problem! It's a nice delay, enjoy