Pedal works alone but not with other pedals.

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nguitar12

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Joined 2014
#1
Hi everyone recently I breadboard-ed a compressor circuit based on the following schematic:

LA-Light simplified for stompbox-use

Pedal works alone but will not work with other pedal. One thing I found weird is that this circuit will work properly only if I tie the sleeve of the I/O jack to the virtual ground rather than the real ground, which is unusual compare to most pedal I built before. I think this might be the reason why this pedal doesn't work with other pedal? Can someone please suggest a solution to this?

Thanks
 
#2
Its own battery? Its own DC supply? Shared supply?

However the schematic appears correct as-drawn. Most likely is a builder error. Wrong-way e-caps is one possibility.

What is "I/O jack"? Input? Output? Telephone?
 
#3
nguitar12 said:
this circuit will work properly only if I tie the sleeve of the I/O jack to the virtual ground rather than the real ground
Click to expand...
I think you are shorting out the negative power supply for your pedal (i.e. the voltage across the lower half of the voltage divider made of the two 18k resistors) when you plug other pedals into the same power supply.

As PRR hinted, what happens if you power this one pedal with a 9V battery, connect it to other pedals, and make sure the metal case of this pedal is not touching any of the other pedals?

-Gnobuddy
 
#4
PRR said:
Its own battery? Its own DC supply? Shared supply?

However the schematic appears correct as-drawn. Most likely is a builder error. Wrong-way e-caps is one possibility.

What is "I/O jack"? Input? Output? Telephone?
Click to expand...

I power all the pedal with the same 9v DC Supply. What I mean by the I/O jack is Input and Output jack.
 
Last edited:
#5
Gnobuddy said:
I think you are shorting out the negative power supply for your pedal (i.e. the voltage across the lower half of the voltage divider made of the two 18k resistors) when you plug other pedals into the same power supply.

As PRR hinted, what happens if you power this one pedal with a 9V battery, connect it to other pedals, and make sure the metal case of this pedal is not touching any of the other pedals?

-Gnobuddy
Click to expand...

I think the main problem is that I have to tie the sleeve of the jack to virtual ground in order to to make this pedal work. So when I connect this compressor to others pedal (which have the sleeve connected to power ground) will make the power ground shorted to the virtual ground.

So I think I have to find a way to make this compressor work with the sleeve connected to the power ground. But I have no idea how it can be done.
 
#7
Yiu are not showing us how you wire the input and output jacks and it looks it´s precisely there that the problem lies.

For one:the Jacks ground must be connected to real ground, which also happens to be the negative leg of the 9V battery , NOT to virtual ground..

If you use an external supply, also show in detail how the supply power jack is connected.
 
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