Rebote 2.5 off voltages problem!

[Lbzg]

Hi,


I have build rebote 2.5 and as always there are problems, same as 1000s outhere, there is no delay coming out and led is ok and pots, and ground and power supply, but ! I have measured voltages and found something that I can't explain and need help from more experienced people here.

Voltages on PT2399 are:

1 - 5.11
2 - 2.55
3 - 0
4 - 0
5 - 2.89
6 - 2.59
7 - 0.20
8 - 0.70
9 to 16 - 2.56

Voltages on TL072 are:

1 - 7.55
2 - 7.55
3 - 7.46
4 - 0
5 - 6.20
6 - 7.52
7 - 7.55
8 - 15.07

Voltages on L78L05 are:

correct layout as on tonepad from left to right:

1 - 5.11
2 - 0.01
3 - 15.07

There are no solder bridges on and I use all components in range from tonepad....

Please I need help...

[slacker]

Your voltages look correct. Are you getting the dry signal just no delay?

I would audio probe pin 15 of the PT2399 to make sure signal is getting to it and probe pin 14 to see if the PT2399 is producing a delayed signal. If you have a delayed signal at pin 14 then the problem is somewhere between there and IC2a. If you get no delayed signal at pin 14 then check the wiring of the delay time pot, if you have one swap the PT2399 into a known working circuit in case it's bad.

[arma61]

Hi

"...and found something that I can't explain " what is that you can't explain.... as far as I can see voltages looks good compared to these and taken into account your power supply is about 15V, except may be pin 7, it should be about the same as pin 8, in your case is just 1/3rd, so check around that pin.

TL072:
1 –  4.78    5 – 4.66
2 –  4.78    6 – 4.77
3 –  4.78    7 – 4.77
4 –  0.00    8 – 9.54

PT2399:
1 – 5.00      9 – 2.50
2 -  2.50    10 – 2.50
3 -  0.00    11 – 2.50
4 -  0.00    12 – 2.50
5 -  2.84    13 – 2.50
6 -  2.49    14 – 2.50
7 -  .55      15 – 2.50
8 -  .58      16 – 2.50


Here is a great advice from Slacker, I got this problem 2 time and solved ......

"Double check the values of all the resistors around pins 13,14,15 and 16 of the PT2399. If you've accidentally switched either the 24k or 47k with one of the 12ks you'll have this problem. Basically with the values switched instead of being amplified each repeat will be reduced in volume, so it's impossible to get more than a few repeats."

and the feednack from the OP
"... Thank you, thank you, thank you.
I removed all the 12K resistors and they all measured around 20K. I replaced them with 11K and the problem is solved. Now I can finish this up for my friend and get mine back. "

Have a look at those positions and let us know.

Ciao

[arma61]

ok, the PT2399 Master beat me. Lbzg... you lucky man... Slacker replied... you'll get it working shotly... I'm sure!!!

Ciao

[Lbzg]

Your voltages look correct. Are you getting the dry signal just no delay?

I would audio probe pin 15 of the PT2399 to make sure signal is getting to it and probe pin 14 to see if the PT2399 is producing a delayed signal. If you have a delayed signal at pin 14 then the problem is somewhere between there and IC2a. If you get no delayed signal at pin 14 then check the wiring of the delay time pot, if you have one swap the PT2399 into a known working circuit in case it's bad.

Yes, dry out totally...pots does nothing on sound and all components are checked before soldering...

[Lbzg]

Your voltages look correct. Are you getting the dry signal just no delay?

I would audio probe pin 15 of the PT2399 to make sure signal is getting to it and probe pin 14 to see if the PT2399 is producing a delayed signal. If you have a delayed signal at pin 14 then the problem is somewhere between there and IC2a. If you get no delayed signal at pin 14 then check the wiring of the delay time pot, if you have one swap the PT2399 into a known working circuit in case it's bad.

Here are my readings:

9 - clean
14 and 12 - delay (slightly but some cracking)

Any ideas? What to check for between IC's - I really don't know what is wrong, all components were fine when I was installing them....

[slacker]

What do you get if you audio probe pin 15? Like Armando said I would also check pin 7, it might not be a problem but it could be, check that you don't have a partial short to ground or maybe replace the cap.

[Lbzg]

At pin 15 i get nothing and on pin 14 and 12 i get delay

[Lbzg]

What do you get if you audio probe pin 15? Like Armando said I would also check pin 7, it might not be a problem but it could be, check that you don't have a partial short to ground or maybe replace the cap.

ok here are finale numbers

At pin 15 i get clean sound
at pin 14 i get delayed sound
at pin 12 i get delayed sound

Help me please I cant get it to work all soldering is fine and if caps are shorted it would not perform delayed sound on audio probe or?

I don't know what is wrong...please help...:-(((((((((((((((

[Lbzg]

At pin 7 there is suttering like radio interference or something but no clean sound or delay....

[Lbzg]

Here are pics and please can someone tell me why does it not work?

I can't stand this any more it is frustrating!

Please help!

[Lbzg]

And Yes, it is detached from 3pdt switch and output, input and ground wires are removed...