Ersatz Verben help!

[GammaFlex]

So I have been pulling my hair out for the past 3 days trying to get this thing to work. I have triple checked voltages, pinouts, layouts, audio path, crossed points, solder joints, sockets, literally just about everything I am capable of checking and it still just doesn't work. I have tried it with 4 different PT2399s and there is just nothing going on.

Here's the schematic that culturejam posted



And here's the layout I used from tagboardeffects

http://tagboardeffects.blogspot.com/2012/03/ersatz-verben-psuedo-reverb-by.html

And here's my board



It is hard to see it because the jumper on the left hides it but there is a 1k resistor going from pin 6 to the 1 lug of the "Time" pot. The regulator is a 7805, I have already tried the 78L05 and still no results.

Solder Side....



Another view....


The pot values are all as stated on the schematic except I changed the time pot to 100kB for longer delay times

Please help as I'm getting to the point of just never wanting to work with ICs at all.

[midwayfair]

So what ARE your voltages?

Have you audio probed pins 11-16?

[flanagan0718]

Looks like there a a few bridges to say the least.
-Check where the regulator is
-check under the IC socket. make sure you have the double jumper
-check where the Pot wires are soldered on.
-check for correct pinout on 7805
-Pin voltages are good too!

[selfdestroyer]

Run a razorblade down the middle of the traces and then do a continuity test on the traces and see if you have any shorts. I have built this from the same layout by Mark so I know it "should" work.

Cody

[culturejam]

I'm pretty sure it should be 78L05. I think the only part I had at the time was the 7805 and I was too ignorant to know the difference.

[GammaFlex]

here's the pin voltages, I just retook them so that I know they're fresh

1: 2.56
2: 2.56
3: 2.56
4: 2.56
5: 2.56
6: 2.56
7: 2.56
8: 2.56
9: 3.86
10: 3.86
11: 2.56
12: 1.31
13: 4.9
14: 4.9
15: 2.56
16: 4.38

I'm going to check for solder bridges and maybe put the 78L05 back in? We'll see what happens..

[midwayfair]

Look at the datasheet.

http://sound.westhost.com/pt2399.pdf

And the schematic for the pedal you're building. You have half supply on a pin that should be grounded. You have half supply on a put that should be your supply voltage. You have more than half supply, all the way up to supply voltage, on multiple audio pins, all of which should be 2.5V.

You must have NUMEROUS problems, including solder bridges and missed connections, for this to happen. You need to pull out the multimeter and use the continuity setting, not your eyes.

[GammaFlex]

I did, I know it sucks that's why I'm troubleshooting it.

[GammaFlex]

Alright... so I have a working delay now, and here's what I found...

I removed the 7805, redid the soldering (lots of good desoldering practice) ran over the entire circuit with the iron and retouched all the points, the components were in the proper locations as I rechecked them against the layout. Cranked up the heat on the iron and eliminated all solder bridges. Also noticed something, I took some of my pin voltages backwards (dyslexia). Now the voltages read correctly, it works well, and I'm happy.

[flanagan0718]

Awesome! A working vero is an accomplishment! Congrats!


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[jimilee]

Is that just slapback delay? I like it.