Rat Problem tonepad

Mcgiver · 25th January 2012, 06:08 PM

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.

9v Battery --- 8.51v

IC LM308N

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

Mcgiver · 26th January 2012, 02:57 AM

anyone?

karul · 10:32 PM

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

--------------------------------------------

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

BF245's pinout

2N5458's pinout

Is your BF245 properly oriented?

----------------

You should have posted this at

DIYstompboxes.com - Index

or

http://www.freestompboxes.org

karul · 8th March 2012, 11:10 PM

Maybe there is a short - it's hard to tell from the picture.

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

25th January 2012, 06:08 PM	#1
Mcgiver diyAudio Member Join Date: Jan 2012	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. 9v Battery --- 8.51v IC LM308N 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

8th March 2012, 10:27 PM	#3
karul 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 -------------------------------------------- BF245 have different pinout than 2N5458 that is suggested by Tonepad. BF245's pinout 2N5458's pinout Is your BF245 properly oriented? ---------------- You should have posted this at DIYstompboxes.com - Index or http://www.freestompboxes.org Last edited by karul; 8th March 2012 at 10:32 PM.

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26th January 2012, 02:57 AM	#2
Mcgiver diyAudio Member Join Date: Jan 2012	anyone?

8th March 2012, 11:10 PM	#4
karul diyAudio Member Join Date: Jan 2011	Maybe there is a short - it's hard to tell from the picture. Use magnifying glass to see the shorts. Check all joints carefully!

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