EHX - Soulpreacher  [schematic]

Discussion regarding early stompbox technology: 1960-1975 Please keep discussion focused and contribute what info you have...
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Post by borislavgajic »

Here are guts of the original
:thumbsup
Attachments
1a.JPG
2.JPG
3.JPG
4.JPG

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Post by borislavgajic »

schematic
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Electro_Harmonix_Soul_Preacher.pdf
EHX Soul Preacher schematic
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Post by trad3mark »

Hey all,

Searched for this, but there doesn't seem to be a thread. Apologies if there is!! Just wondering if anyone has one of these or has built one? I'm looking at building a compressor with the parts that i have and this one seems mighty nice. The schematic is all over the web, and there's two drawings of it:

Drawing 1:
Image

Drawing 2:
http://www.schematics.ca/modules/PDdown ... 67&lid=473

It looks pretty simple, and from listening to it and trying it out in the shop, it seems like a nice straightforward one to go for. From working through it to make a vero out of, i've noticed one or two things so far that maybe people can shed some light on?

First up, the voltage biasing. I ran a sim of this in Yenka, and it was grand. Thing is though, if i'm trying to make a small vero, there's easier way to bias 9v to getting +9v and +4.5v. I don't see any problem with using an easier method, right?
Secondly, if you look at the input stage, where the switching for True bypass is, there's a buffer before. Is this really necessary? (without getting into the debate of "are buffers necessary at all?")

won't get a chance to breadboard this for a bit, but if it sounds as awesome as the originals looked (http://farm4.static.flickr.com/3053/280 ... 09.jpg?v=0) then i'm sold.

tm

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Post by mictester »

trad3mark wrote:
First up, the voltage biasing. I ran a sim of this in Yenka, and it was grand. Thing is though, if i'm trying to make a small vero, there's easier way to bias 9v to getting +9v and +4.5v. I don't see any problem with using an easier method, right?

Secondly, if you look at the input stage, where the switching for True bypass is, there's a buffer before. Is this really necessary? (without getting into the debate of "are buffers necessary at all?")

tm
First - Electro Harmonix never wasted any components - there's a reason for the use of every part! The reason for the more complicated biasing circuit is that it will have lower noise than a simple resistor voltage divider and can use a lower value capacitor for the 4.5 Volt rail.

The buffer is a good idea before the compressor stage - it isolates the gain reduction circuit from the preceding device (whether a guitar or another effects unit). You could put your bypass switching before the buffer if you really want, but I find it's good to have that buffer to provide a known, low output impedance, which is similar to the output impedance of the compressor itself, so there's no loading change when it's switched in or out.
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Post by dajm »

here's a link to a pcb layout over at diystompboxes.com that may be of use, I don't know if it's verified.

pcb - https://www.aronnelson.com/gallery/main. ... P.gif.html

layout - https://www.aronnelson.com/gallery/main. ... T.gif.html

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Post by borislavgajic »

I made one 5 years ago

borislav

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Post by Bernardduur »

Anyone has any info on the 3080 version of the SP???? I have one in my Big Muff Deluxe and it sounds really flat; everything is squised
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Post by lolbou »

Bernardduur wrote:Theads should be merged!
Done! :wink:
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Post by borislavgajic »

Bernardduur wrote:Theads should be merged!

Anyone has any info on the 3080 version of the SP???? I have one in my Big Muff Deluxe and it sounds really flat; everything is squised
that is similar to blackfinger or lowfrequency compressor?
https://www.freestompboxes.org/viewtopic ... or&start=0

or is it like in deluxe octave multiplexer....
http://sites.google.com/site/electrocon ... actory.jpg

boris :block:

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Post by Bernardduur »

This is simplification of the comperssor in the Big Muff Deluxe; a OTA based Soul Preacher
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Soul preacher.JPG
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Post by RnFR »

there are clippers on the output?
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Post by mictester »

RnFR wrote:there are clippers on the output?
There have to be! They don't clip very much at all - they're there to handle the "overshoot" of the compressor. The compressor has a fairly slow attack, so the initial peaks can get chopped off by the diodes.
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Post by pedalgrinder »

has anyone tried this pedal on a bass curious as to how it would be on bass
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Post by mictester »

pedalgrinder wrote:has anyone tried this pedal on a bass curious as to how it would be on bass
Yes. It's horrible.

It's pretty bad with a guitar too, but much worse with a bass!
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Post by pedalgrinder »

yeah by looking at it would distort and respond by like shit the type of attenuation and side chain looked average
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Post by Bernardduur »

The OTA version doesn't sound THAT bad on bass....... it gives it a nice squish and a nice expression on the low notes..... just maybe for me too much squish!!!
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Post by pedalgrinder »

wheres the schematic for the ota version i've never seen it any chance you could post it or email it to me. I'd love to see it cheers
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Post by phibes »

pedalgrinder wrote:wheres the schematic for the ota version i've never seen it any chance you could post it or email it to me. I'd love to see it cheers
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Post by pedalgrinder »

hang on thats not a soulpreacher then it is a blackfinger i've seen that one. Different pedal. you said there was a ota version of a soulpreacher or since you wrote it in this thread call EH soulpreacher i assumed thats what you meant. Thanks anyway
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Post by pedalgrinder »

Actually while on the subject of different compressor's that EH made the the low frequency compressor would be a good one also i reckon. Transistor attenuation i've found i like the response and warmth when a transistor attenuates it.
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