Rebote Delay not working...

[New Blood]

Hey there,
my friend and I built the Rebote Delay 2.5 from tonepad:
http://www.tonepad.com/getFile.asp?id=98

We built the PCB ourselves, and used the offboard wiring from tonepad also:
http://www.tonepad.com/getFile.asp?id=76 (offboard wiring 2)


Well, we finished everything... but there is no delay.
When the effect is turned off, everything's fine,
but when we turn on the delay, everything's keep being the same, just like when its turned off.
The pots make no difference too.

We checked with an ohmmeter the PCB and all the suspicious solderings, everything appears to be fine.
Also, the regulator outputs 5v.

we used a 4.7pF cap instead of a 5pF and a 47pF cap instead of a 51pF cap, but in tonedpad they say its okay.
The rest of the components are accurate, we even checked with the ohmmeter that the resistors have the right resistance.

We read somewhere that if you have a TI's TL072 chip it causes exactly the same problem. Ours is ST's, but maybe it can cause it too?

The voltages on the ICs are:

PT2399:

1: 4.93
2: 2.48
3: 0
4: 0
5: constantly changes between 0.2-4.9
6: 2.48
7: 0
8: 0
9-16: 2.47

TL072:

1: 5.12
2: 5.11
3: 5.09
4: 0
5: 4.11
6: 5.13
7: 5.13
8: 10.22

I've attached some pictures, as you can see the circuit is currently without the switch for the sake of testing.
Please ignore the missing pot, I can assure you it was there during the tests.

Can someone tell what's wrong?

Thanks, Dan.

[thedefog]

Hey Dan,

Get out your continuity tester and check the traces on your board. From the picture, It looks like you have a few places where it wasn't etched as well as it could have been. I run into this same issue myself when etching my own boards and end up having to solder jumpers in place to correct bad traces. Sometimes it doesn't even look like it's a problem, but when you test it you don't have continuity. I actually stopped etching boards recently for this very reason. I just buy them from users on this message board and tonepad, since they're cheap enough and it isn't worth the hassle of dealing with etching and drilling and debugging later on.

[blooze_man]

I'm sorry I have nothing helpful to add but I had to ask.. What is a Star Munchkin? 

[Govmnt_Lacky]

What is a Star Munchkin? 

+1 

[jacobyjd]

I'm sorry I have nothing helpful to add but I had to ask.. What is a Star Munchkin?  

It's an expansion pack to a hilarious role-playing card game.  

[New Blood]

Hi,
We've checked the PCB and it's all fine.
any others ideas?

[Govmnt_Lacky]

First of all... read through the following thread:

http://www.diystompboxes.com/smfforum/index.php?topic=29816.0

Next, repost with all of the stated voltages in that thread.

That will get you farther.

I really do not like the looks of all those ZEROs on the PT chip but I could be wrong. 

Good Luck 

[anchovie]

I really do not like the looks of all those ZEROs on the PT chip but I could be wrong. 

Pins 3 & 4 are ground, 7 & 8 at zero is fine also.

The IC voltages are nothing suspicious. This build needs an audio probe way more than it needs more DC voltage measurements.

[thedefog]

Hi,
We've checked the PCB and it's all fine.
any others ideas?

Audio probe is definitely the way to go at this point. Sometimes I just reflowing solder on all the board points. You might have a cold solder joint or a hard to see bridge somewhere.

[Jule553648]

I had exactly the same problem as you. (pots not working, no delay)

Never solved it. Still haven't made a new working one.


topic:

http://www.diystompboxes.com/smfforum/index.php?topic=82626.0