Re: op amp-based effects loop circuit for guitar amplifier

On Tue, 19 Jul 2005 00:02:43 +0100, Pooh Bear
<rabbitsfriendsandrelations@xxxxxxxxxxx> wrote:

>
>YD wrote:
>
>> Whatever you do, DO NOT try to use the +B supply for this circuit.
>
>Why do you say that ? It's good enough for Marshall and if there's no
>other volts readily available inside the box......
>
>Graham

Well, of course it can be done, but unless you're sure of what your
doing can be a bit dangerous. If any of the bias zeners happen to fail
open there'll be much merriment.

To Eric (OP): If you want to try it, you'll need to feed the supply
circuit with about 6 mA, the TL072 draws 4 and the rest goes through
the zeners. You'll need to drop 350 volts from the +B over a 56k 5W
resistor connected between +B and the +30V point of the supply.

- YD.


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