Sinner Bass Drive Problem

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TheRTmiller
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Post by TheRTmiller »

Hello everyone,

I‘m completely new to the pedal building game and I‘m having some start problems. I build the Sinner Bass Drive from PCB and it doesn‘t do ANYTHING. I was pretty confident that I soldered all the parts in their rightful places but maybe there‘s something I‘ve forgotten. How do I best go about finding the problem with such a project?
I‘ve attached some pictures, I would be very grateful for any help here.
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TheRTmiller
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Post by TheRTmiller »

By now i figured out that i had the long chips the wrong way around. At least the direct output works now, but no output once i switch the pedal on

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mauman
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Post by mauman »

Welcome! And congratulations on your first build. We can help.

First, go to http://www.geofex.com/ and look for "guitar effects debugging page", the link is at the top left of the home page.

Then check out the first post here, viewtopic.php?t=22602, you've provided pictures and a description which is great, and I'll post the build doc and schematic for you here (I think these are correct for your PCB, please check.)

Then verify that you have good power: check DC voltage with a multimeter between ground, and pin 8 of each of the TL072 (smaller IC), and again between ground and pin 4 of each of the TL074 (larger ICs.)

If you put some ICs in upside down and applied power, they might not have survived. If so, an audio probe will tell you how far the signal is getting before it quits. It's not too hard to assemble one yourself: viewtopic.php?t=6820
Sinner-Bass-Drive-1v2-Schematic.pdf
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Sinner Bass Drive 1v2 Build Doc
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mauman
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Post by mauman »

In the pictures you posted, all four of your ICs are upside down, the notch or little dot shows pin 1, which is oriented to the north of the PCB, in the pictures they're all pointed south. Could be as simple as that.

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TheRTmiller
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Post by TheRTmiller »

Thank you very much for your help, that is the kind of systematic aproach i was hoping to find.

By now i suspect to have a short or a damaged part somewhere. I‘m not getting a decent voltage at the input pins of the ICs. However i could not find the mistake yet. I suspect the error to be quite early in the circuit, i‘m measuring 0.25v from the power socket to ground….

What best do to now? Start soldering out parts and measuring them individually or start building an audio probe?

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mauman
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Post by mauman »

Since all four ICs are in sockets, I'd remove all of them, then power up and check the voltages again on the sockets. Could be a blown IC is shorting the power to ground. If voltages are not good @ sockets, start measuring voltage at the DC input jack and work forward. If voltages are good @ sockets without ICs installed, replace ICs one at a time and measure voltages to see which one(s) are bad. One or more may still be damaged and not pass signal. For a dollar or so each, I'd just go ahead and replace all four. Or once you have good voltages at the ICs, you can make an audio probe and start tracing the signal from input to output.

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mr.mdh001
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Post by mr.mdh001 »

I had the same problem. There needs to be a jumper on pads 2 & 3 for version v1 and 1v1.

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