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Old 25th January 2012, 06:08 PM   #1
Mcgiver is offline Mcgiver  Paraguay
diyAudio Member
Join Date: Jan 2012
Default Rat Problem tonepad

Hello, I hope you are well.
I am new to the forum, my English is not very good, I hope they know excuse.
I have a problem with the pedal tonepad The Rat.

Well, after having a bad accident with the first attempt by Proco Rat, I decided to make the Tonepad, as many told me that I worked very well.

I did everything, PCB, soldering, etc.., But I get the same problem as with the first, if I put the volume pot half hummmmmm is heard, but the guitar sounds, if you put to the maximum or minimum disappears but the guitar does not sound either, I went crazy looking for what may be the error.

The first thing I did was to give the page Stomps, I was really going crazy this as more than 2 weeks ago I am for him and not get it to work. It will replace the potentiometers in case, but neither worked.

I hope I can help and can not find the solution anywhere.

The transistor is a BF245C, the diodes are 1N4148, the IC is LM308N, because here I could not get all the components that request.

I leave some pictures and voltage itself.

Thank you.

Click the image to open in full size.

Click the image to open in full size.

9v Battery --- 8.51v


1- 0.02
2- 0.80
3- 2.07
4- 0
5- 0
6- 0.74
7- 8.49
8- 0.02

Transistor BF245C

G --- 0.00
S --- 4.09
D --- 8.48
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Old 26th January 2012, 02:57 AM   #2
Mcgiver is offline Mcgiver  Paraguay
diyAudio Member
Join Date: Jan 2012
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Old 8th March 2012, 10:27 PM   #3
diyAudio Member
Join Date: Jan 2011
Mcgiver, La Rata (Tonepad's RAT) works fine.

First off all, you should be more patient.
Obviously, there are some errors in your RAT.
You did a good job, providing the IC, and transistor voltages.

There is something wrong with LM308N voltages. They should be something like this:

Pin 1 - 8.4v
Pin 2 - 4.5v
Pin 3 - 4.1v
Pin 4 - 0v
Pin 5 - 0v
Pin 6 - 4.5v
Pin 7 - 9v
Pin 8 - 4.6v

Click the image to open in full size.


BF245 have different pinout than 2N5458 that is suggested by Tonepad.

BF245's pinout
Click the image to open in full size.

2N5458's pinout
Click the image to open in full size.

Is your BF245 properly oriented?


You should have posted this at

DIYstompboxes.com - Index



Last edited by karul; 8th March 2012 at 10:32 PM.
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Old 8th March 2012, 11:10 PM   #4
diyAudio Member
Join Date: Jan 2011
Maybe there is a short - it's hard to tell from the picture.
Click the image to open in full size.

Use magnifying glass to see the shorts. Check all joints carefully!
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