Rebote delay 2.5 not working :(

[juhani]

I built rebote delay on vero using this layout: http://diy-layout.com/44.
I wired the 3pdt using this layout: http://www.generalguitargadgets.com/diagrams/switch_lo_3pdt_tb_battery.gif
But i get only dry signal when bypass is on and off, pots do nothing.  

What i have noticed/done:
-3pdt is working right.
-I sound probed the pt and i got dry slightly filtered signal to pin 15 and if i remember right, to pin 10 (i'll check that later). Pin 12 won't give me the delayed sound :/
-I made bridge check with digital multimeter, didn't find any.
-I double checked component layour (find one cap leg in wrong place, fixed that), resoldered pots, no help.
-I checked the resistor values and they were ok, don't know how to check capacitors.

-Input voltage to pt2399 is about 5v and to TL072 is about 9v, so i guess 78L05 is working good. i'm going to post full list of voltages later.

I made a "slight" mistake when trying the board with 9v adapter and connected it wrong way.. and also one cap leg (C8) was in wrong strip (14 instead of 13), fixed that and didn't help. could this fried the pt2399?
how do i know that chip would be bad? i didn't use socket (stupid me) so swapping the chip is not so easy and i don't have spare chip yet..
Should i try to desolder everything?

i've been trying to debug this few days now, help is very much appreciated.

[iccaros]

do a continuity check with your meter, from pin 2 pot to R1 and from R1 to pin 6 of the PT2399
I had a problem with the TonePad board where these connections were broken and I got no delay when on.

[juhani]

yep, i don't get connection to pin 6... going to check that little closer.

[juhani]

i get connection from delay pot pin 2 to R1 (strip 16) and from R1 (strip 14) to PT pin 6.
don't get connection from pot pins to PT pin 6.
how this should work?

[juhani]

Here are the voltages:

TL027
1 = 4,26
2 = 4,26
3 = 4,26
4 = 0
5 = 4,15
6 = 4,26
7 = 4,25
8 = 8,51

PT2399
1 = 4,97
2 = 2,48
3 = 0
4 = 0
5 = 2,53
6 = 2,31
7 = 0,5
8 = 1,19
9-16 = 2,48

Is there something wrong with these values?

[Govmnt_Lacky]

i get connection from delay pot pin 2 to R1 (strip 16) and from R1 (strip 14) to PT pin 6.
don't get connection from pot pins to PT pin 6.
how this should work?

You shouldn't get a DIRECT connection from Pot Pin 2 to PT Pin 6. You should have 1K of resistance (R1) between them.

If it is showing an open or infinite resistance, then R1 is most likely bad or there is a cold solder joint.

Good Luck 

[juhani]

i get connection from delay pot pin 2 to R1 (strip 16) and from R1 (strip 14) to PT pin 6.
don't get connection from pot pins to PT pin 6.
how this should work?

You shouldn't get a DIRECT connection from Pot Pin 2 to PT Pin 6. You should have 1K of resistance (R1) between them.

If it is showing an open or infinite resistance, then R1 is most likely bad or there is a cold solder joint.

Good Luck 

There is no direct connection pot pin2 to pt pin 6. and R1 shows right value.
Between strip 15 and 16 in low-left is connection, i think there shouldn't be.

Damn this drive me insane, but thanks

[iccaros]

The only hint I can give you. I use the schematic, not the layout, and check connectivity through out the entire CKT. Even thought the layout may be "verified" it may be wrong. so use the schematic when doing checks and the layout is for which componet is which. tone pad has the schematic.

[juhani]

F**k yeah! got it working!  

I changed the PT2399 chip (i used socket this time..) and 2 caps near first pins and the delay heaven started
now i really can get going with my upcoming dual delay project..

I'm not sure what made it working, but got to test with the old chip was it bad, or was it the caps or what..
Must inspect that!

Thank you so much, great forum!

EDIT:
Yeah, the old chip was dead. Tried it and no delay.

[tasos]

Hmmm....
So was the chip dead because of something you did wrong or is there someone out there selling dead chips?

[juhani]

Hmmm....
So was the chip dead because of something you did wrong or is there someone out there selling dead chips?

We'll never really know    but think i made all the possible beginners mistakes with this one.. got to start somewhere

[iccaros]

since he directly soldered the chip, I am going with too much heat or a static discharge.