PT-80 delay (or lack of) PROBLEM

[disto]

hey,

i recently built a PT-80 delay! i followed the PCB exactly to the design on GGG, i used 47K POTs and the .015uf caps i used .010uf, and followed the millenium bypass version.
when i plug the delay in the bypass LED works and i get a clean signal but can hear no delay or repeats, if i plug a distortion (from KORG ax1500g)following the pedal, i can hear a pulsing sound that can be changed using the POTS i think this is from the delays chips time clock and shows it is working.

can anyone suggest what the problem with the pedal is, why do i have no repeats?

pictures below

[KORGULL]

Since I see you are using a 9V battery, the first thing I'd ask is, did you remember to jumper the pads where the 12V regulator would be?

Make sure that the 570/571 chip is inserted the correct way around. I can't tell from the photo if it is or not.

*EDIT: Now that I looked closer at the layout diagram, I think your LED wouldn't be getting power if you didn't connect those regulator pads.
Did you try taking any voltage readings yet?

[disto]

ah right ok bit confued about the jumper i basically conected connected! right i have actually confused myself here!

few ok that took a while to work out



so the battery is connected in the normal way wire the + going to + of the 12Volt and the - going to ground, i put a dc jack in there too.

how should it have been wired? would this effect the delay?
i have power to the board as the LED lights

as far as i can tell the 570/571 is in correct with the dot facing to the left

[powerplayj]

Can this thing even run off a 9V without a charge pump?

[disto]

apparently, if you read the project info file it says they chose the 17volt for its "added headroom", "but the circuit will work fine with a 9 VDC supply"! this is the second board i built i did try a charge pump and that had the same problem!

[KORGULL]

OK, just to be sure we're straight on this whole jumpered pad business, the project file at GGG states:

...but the circuit will work fine with a 9VDC supply. In this case, you would jumper the pads for the 12VDC regulator input and output, and then you could use a regulated 9VDC wall wart, such as the Ibanez AC109. Battery operation could then be implemented with a DC power jack that disconnects the battery + when the wall wart is inserted...

So I would take that to mean that if you are not using an 18V supply, and therefore not using the 12V regulator, that you need to connect together the pads where the input and output of the 78L12 regulator would've went. Otherwise power will not be able to flow beyond the pad that is meant for the 78L12 input pin.

If you haven't already done this, look at the parts layout diagram and locate the spot for the 78L12. Now, using a piece of wire, connect the two outside pads where that part would be. The middle pad is ground, just leave it alone.

Hope that helps.

[disto]

right ok so would you advise using a charge pump instead?

if not i connect the  12V part like this!



and where would i put the + into the board?

[Skreddy]

[disto]

should this cure the no delay problem?

[KORGULL]

Do it the way Skreddy showed you in his picture, and if you have everything else done correctly, the pedal should work.

[disto]

ah ha! problem solved
was just trying it on a 9v battery and the pedal really does use them up fast! getting some distortion on repeats but i think this is due to the dying battery!

ill be able to test this theory as soon as i drill the hole for the dc socket

thanks guys