EHX - Holy Grail  [schematic]

All about modern commercial stompbox circuits from Electro Harmonix over MXR, Boss and Ibanez into the nineties.
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platinum321
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Post by platinum321 »

I was wondering if anyone had anything on this particular pedal?

Thanks for any info. :D

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tuemmueh
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Post by tuemmueh »

Yes. It's DSP-based. Sorry ... Buy one and rebox it, that's the only thing you can dby (do by yourself) to mod this circuit without being in programming-stuff.

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platinum321
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Post by platinum321 »

Rrrrrrrrrrrats! :?

Thank you for the info. May as well delete this topic eh?

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echodeluxe
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Post by echodeluxe »

hey, i got a holy grail with a fried resistor and i need the schematic! can anyone help?
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aaholygrailrbsch.pdf
EHX - Holy Grail schematic
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echodeluxe
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Post by echodeluxe »

nevermnind.

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mensur
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Post by mensur »

Here you go!!!.

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analogguru
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Post by analogguru »

mensur wrote:Here you go!!!.
Please don´t post copyrighted schematics. They will be removed like in this case.
Feel free to send it your friends instead by e-mail on request.

analogguru
There´s a sucker born every minute - and too many of them end up in the bootweak pedal biz.

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BJF
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Post by BJF »

Hi,

If that's the 47R resistor that sits just before the regulator you can replace that with an 1N4002 diode.
The supplies these come with leave a little too high voltage and these are better driven by a stabilized 9V at least 200mA supply.


Have fun
BJ

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Barcode
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Post by Barcode »

BJF wrote:Hi,

If that's the 47R resistor that sits just before the regulator you can replace that with an 1N4002 diode.
The supplies these come with leave a little too high voltage and these are better driven by a stabilized 9V at least 200mA supply.


Have fun
BJ
i find that in some units i have worked on or owned, that at least 500mA was required (which is the rating of the stock adapter) to keep the reverb clean.

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