Prescription Electronics - COB ( Clean Octave Blend )  [traced]

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analogguru
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Post by analogguru »

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

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puppiesonacid
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Post by puppiesonacid »

you think maybe this is a green ringer with volume and clean blend functions added? hmmm...

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Post by analogguru »

It´s more a mix of a Fender blender input stage (similar can be found in the foxx Tone-Machine and Univox Uni-Fuzz) followed by a foxx Tone-Machine Octave/Distortion-engine. Have a look at these schematics.

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Post by puppiesonacid »

where are the schematics? I've been digging around for them for a while and can't find them anywhere...

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analogguru
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Post by analogguru »

puppiesonacid wrote:where are the schematics? I've been digging around for them for a while and can't find them anywhere...
Learn how to use the search function - if you type in "Fender" and "Blender" you will get this:
viewtopic.php?f=19&t=141&p=768&hilit=fe ... ender#p768

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Post by puppiesonacid »

analoguru you have a PM, also if anyone knows where I can find an prescription electroincs schematic for the COB let me know. I'd like to compare them with the blender.


Thanks.

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Post by noelgrassy »

I'd like to add pictures of mine. It's an earlier version but appears identical to the model submitted by AG.

Image

Those of you with an art program capable of creating "layer" images of varying opacity should be able to convert these two into a
usable schematic diagram.

Image

I drew up a schematic years ago that I'll submit for reference to parts values at best.
The picture host has lopped off the right hand side of these pics. At least on these included pics. Bummer. Here's the links to the
picture files. I hope it helps.

https://i145.photobucket.com/albums/r22 ... 12-952.jpg

https://i145.photobucket.com/albums/r22 ... 12-951.jpg
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Post by puppiesonacid »

awesome! thanks, but the pic of the tracks is still lopped off. can you take another and post?


puppiesonacid

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MoreCowbell
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Post by MoreCowbell »

puppiesonacid wrote:awesome! thanks, but the pic of the tracks is still lopped off. can you take another and post?


puppiesonacid

Just "right click" on your mouse and select "view image"...you'll see the tracks.

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Post by puppiesonacid »

no, the bottom left corner of the pcb tracks is cut off in the picture.

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Post by MoreCowbell »

puppiesonacid wrote:no, the bottom left corner of the pcb tracks is cut off in the picture.
using this pic the AG linked you should be able to figure it out.
http://www.digimart.net/images/64/DS00252872_3.jpg

it "looks" at a glance like the traces end there, so whats off the pic are just offboard connections...but i didnt look closely or analyze it.

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Post by noelgrassy »

That is where the board endeth. There's nothing on the other side of those 2 solder pads.
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Post by noelgrassy »

All xistors are 2N3904, all diodes are 1N4001, all the 'lytics are 10uf @ 16VDC, except the one located bottom/right
side of board.
That little fella's a 1uf @ 50VDC.
Blue Mylar caps are 100n.
Polyprop cap sez 1000 pf.

Pots are:

Blend=250k Log or "B" type
Octave= 1M Log
Volume= 100k Log
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Post by analogguru »

And here comes the
Prescription Electronics - Clean Octave Blend schematic

enjoy and compare,
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Post by puppiesonacid »

Thank you AG! : :D

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Post by sergedeep »

does it sound good?

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Post by puppiesonacid »

idk, but I want to find out

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Torchy
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Post by Torchy »

Not yet verified - any errors lemme know ...

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Post by puppiesonacid »

torch, you rock. thanks man

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Post by rousejeremy »

I built this using what I assume is Torchys vero and can't get it to work. There is a direct guitar signal without power, but when power is hooked up, just noise.

Has anyone else built it?

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