HELP!! Debugging Rebote 2 Delay pedal

[mitzrecords]

http://www.tonepad.com/project.asp?id=27

hi, so i made this delay pedal a while ago. it didnt work but i figured it out that opamp was bad and replaced. and it worked!

today i went to play it but all of sudden again!, it doesn't work. bypass is fine but when pedal is on, there is no sound. I went through debugging and checked connections etc. but seems like parts are bad maybe?

i measured the voltage throughout I noticed pin #3 of IC PT2399 is zero and pin #4 of IC TL072 is also zero.

what does this mean???

please help me!!

im so frustrated as it was working...

[ppatchmods]

I would also like some help on this. I have 2 rebote 2.5's that have been subjected to ac power(not by me) and no longer work. They both power up but no sound when engaged.

[Auke Haarsma]

check the schematic. Pin 3 of the PT2399 is connected to GND, 0V reading is ok. Same goes for pin 4 of the TL072.

AC could mean trouble. Post voltages on all IC's.

[mitzrecords]

Hi, thank you so much for reply!!

Here are the voltages on ICs

IC 1 Delay Chip
1 --5
2 --2.5
3 --0
4 --0
5 --2.3
6 --2.5
7 --0.6
8 --1
9 --2.5
10 --2.5
11 --2.5
12 --2.5
13 --2.5
14 --2.5
15 --2.5
16 --2.5

IC2 Op Amp
1 --4.6
2 --4.56
3 --4.62
4 --0
5 --3.46
6 --4.4
7 --4.4
8 --9

i heard that pin 5 on op amp should be higher. if op amp is not working properly, this is really strange since i replaced it before because it wasnt working and after i put a new op amp, it was working for a while but all of sudden, no sound when on.

so if i have to replace op amp, this will be second time in really short period of usage. maybe i have something else wrong?

thanx!!!!

[Auke Haarsma]

Voltages look ok.

Do you get a sound out of Pin 14 of the PT2399?

[mitzrecords]

Voltages look ok.

Do you get a sound out of Pin 14 of the PT2399?

sorry. what do you mean by that? do I just tap it plugeed it literally to get a sound?

[Auke Haarsma]

you could use an audiopobe (check geofex.com).

I just 'plug in' there. If you can visualize with an oscilliscope that's easier ofcourse. But not everyone is so lucky to have a scope at hand

[mitzrecords]

you could use an audiopobe (check geofex.com).

I just 'plug in' there. If you can visualize with an oscilliscope that's easier ofcourse. But not everyone is so lucky to have a scope at hand

ohh ic
thanx for suggestion. i have to order parts now. just curious is there any other way as well?

thanx

[Auke Haarsma]

no need to order anything. Just connect a wire to a jack. Connect to other side of the wire to whatever you wanna listen to (in this case pin 14).

[mitzrecords]

no need to order anything. Just connect a wire to a jack. Connect to other side of the wire to whatever you wanna listen to (in this case pin 14).

thank you auke.

so plug in 1/4" cable input and 1/4' cable to amp and input cable touch that pin 14 to hear noise through amp?

[Auke Haarsma]

Almost

2 cables:

1) Guitar -> Jackcable -> Input of Rebote.

2) Amp -> jackcable -> jackbus (connect sleeve to ground). Tip of jackbus to a wire. That wire you can use to listen to the signal anywhere you plug it in.

[mitzrecords]

Almost

2 cables:

1) Guitar -> Jackcable -> Input of Rebote.

2) Amp -> jackcable -> jackbus (connect sleeve to ground). Tip of jackbus to a wire. That wire you can use to listen to the signal anywhere you plug it in.

:icon_redface:sorry auke. i sound dumb but jackcable means ordinary 1/4" guitar cable?

jackbus?

thanx

[Auke Haarsma]

No need to say sorry, I should have been more precise!

jackcable is indeed your normal guitar cable.

jackbus is something like this:


or

[mitzrecords]

Hi, Auke. thank you.

I just tested the sound. I get sound from any pins of Dealy IC.

??

[Auke Haarsma]

You get sound?

Or do you not get sound?

[mitzrecords]

I get sound.

[Auke Haarsma]

You should only get sound on Pin 16,15,14 of the PT2399.

I suspect something went wrong with the audioprobe.

[mitzrecords]

You should only get sound on Pin 16,15,14 of the PT2399.

I suspect something went wrong with the audioprobe.

oops  you were right.

i got sound from 14 15 but not 16.

and those sound i got was delay lay lay lay>>>>>

exciting!!

[mitzrecords]

seems like almost there??

[Auke Haarsma]

yeah seems like the PT2399 is working ok.

Now follow the signal to the Repeats and Level pot. Still good sound?