Need Advice On Converting a Stomp Box Preamp - diyAudio
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Old 13th July 2006, 04:59 PM   #1
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Join Date: Jun 2006
Default Need Advice On Converting a Stomp Box Preamp

I found this JCM800 emulator stomp box schematic on the web and was wondering if someone could offer some advice on converting it to use a +-15V supply? It says the author is "Electric" but searching for that and "JCM800 Emulator" that on the net let me no where.

Also if you know who the author is and know his web site if he still has one can you point me to it?

Thanks!
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Old 13th July 2006, 05:38 PM   #2
sreten is offline sreten  United Kingdom
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Location: Brighton UK
Hi,

The design needs a very stable supply to work, i.e.
a battery, as its inherent ripple rejection is very poor.

Any particular reason you want a 15-0-15 V supply ?

/sreten.
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Old 13th July 2006, 06:23 PM   #3
teemuk is offline teemuk  Finland
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Default Re: Need Advice On Converting a Stomp Box Preamp

Quote:
Originally posted by turbolx5oh
...if someone could offer some advice on converting it to use a +-15V supply?
How much advice do you need? Basically it goes like this: Connect drain resistor to positive supply and gate and source resistors to negative supply. Check whether the voltage/wattage ratings remain adequate and rebias the gain stages. Sreten is right about the poor ripple rejection; you should filter the supply well. You'd probably need filters between gain stages as well - without them the circuit might "motorboat".
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Old 14th July 2006, 08:09 AM   #4
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Sounds like since the circuit might be a bit unstable, I may look further for something else. Maybe the Guitar preamp on ESP.
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