Help With A Schematic

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william_gallagher@comcast.net - 16 Nov 2005 04:15 GMT

I've just completed this device and it does what it's supposed
to(distort a guitars output signal) but has no gain... Can anyone help
me try and get more gain out of this pig? Perhaps change some of the
devices values...add pots? Who knows I don't... see this hyperlink to
view the schematic ( http://www.diystompboxes.com/pedals/orange.jpg )

Thanks

Bill

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Ross Marchant - 16 Nov 2005 05:28 GMT

> I've just completed this device and it does what it's supposed
> to(distort a guitars output signal) but has no gain... Can anyone help
[quoted text clipped - 5 lines]
>
> Bill

What transistors are you using?

Ross

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william_gallagher@comcast.net - 16 Nov 2005 15:02 GMT

bc109's

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Dand - 16 Nov 2005 07:33 GMT

> I've just completed this device and it does what it's supposed
> to(distort a guitars output signal) but has no gain... Can anyone help
> me try and get more gain out of this pig? Perhaps change some of the
> devices values...add pots? Who knows I don't... see this hyperlink to
> view the schematic ( http://www.diystompboxes.com/pedals/orange.jpg )

Start by lowering the 4.7k a bit

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Bill Gallagher - 17 Nov 2005 04:30 GMT

Lower it to what value ?

Bill

> > I've just completed this device and it does what it's supposed
> > to(distort a guitars output signal) but has no gain... Can anyone help
[quoted text clipped - 3 lines]
>
> Start by lowering the 4.7k a bit

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Johnny - 17 Nov 2005 11:16 GMT

>I've just completed this device and it does what it's supposed
>to(distort a guitars output signal) but has no gain... Can anyone help
[quoted text clipped - 5 lines]
>
>Bill

I have no experience with guitar effects, so I need to ask what is the
impedance of the source driving this circuit?

You might try increasing the 22k to 47k or 68k to see if that makes a
difference. You should also check very carefully that you built it
right.

regards,
Johnny.

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Franc Zabkar - 17 Nov 2005 19:34 GMT

>I've just completed this device and it does what it's supposed
>to(distort a guitars output signal) but has no gain... Can anyone help
[quoted text clipped - 5 lines]
>
>Bill

The first thing I would do is to verify your construction by taking
some DC bias measurements with the input shorted to ground. I'd expect
a voltage of 2.1V at the collector of the first transistor, for
example.

-- Franc Zabkar

Please remove one 'i' from my address when replying by email.

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Electronics Forum / Electronics / November 2005

Help With A Schematic