Prescription Electronics - RX Overdriver

analogguru · Post by **analogguru** » 17 Jul 2007, 19:44

pf fan found this pictures of the RX Overdriver:

http://www.digimart.net/images/1220/DS00255536.jpg
http://www.digimart.net/images/1220/DS00255536_1.jpg

analogguru

bluetoad · Post by **bluetoad** » 17 Jul 2007, 22:03

Eew, what a Rat's nest. I gotta get in on this boutique bull!

RLBJR65 · Post by **RLBJR65** » 17 Jul 2007, 22:36

It looks like the board is being held in place by the Stomp switch!?
At least they are not making any outrageous claims

Colorsound overdrive clone with a volume pot added.

analogguru · Post by **analogguru** » 11 Feb 2008, 08:16

guts:

http://i22.ebayimg.com/03/i/000/d9/2b/f544_3.JPG
http://i12.ebayimg.com/04/i/000/d9/2b/fe8c_3.JPG
http://i19.ebayimg.com/02/i/000/d9/2c/084e_3.JPG

analogguru

The Rotagilla · Post by **The Rotagilla** » 11 Feb 2008, 15:18

I had one at the house last week. Insides looked the same which is why I didn't bother taking pics. It doesn't sound bad but it wasn't good enough to keep either.

sonicvi · Post by **sonicvi** » 11 Feb 2008, 15:42

He uses solid core wire though, so while it doesn't look very good the wires aren't flopping around or anything.

soulsonic · Post by **soulsonic** » 11 Feb 2008, 15:46

Wires everywhere!

noirengineer · Post by **noirengineer** » 08 Apr 2009, 20:18

here's mine.. even uglier.. but i love the circuit...
it's my fav OD booster pedal.. I want to make a clone
but can't find a proper schem.. the build quality is pretty
poor, but the sound of this thing is amazing!

Anyone have a vero, schem, or layout?

Gila_Crisis · Post by **Gila_Crisis** » 09 Apr 2009, 08:13

nice, i don't know why but this reminds me a lot of a Colosound Overdrive

Bernardduur · Post by **Bernardduur** » 09 Apr 2009, 08:19

I thought it also is one

puppiesonacid · Post by **puppiesonacid** » 09 Apr 2009, 15:08

Gila_Crisis wrote:nice, i don't know why but this reminds me a lot of a Colosound Overdrive

thats what it is...

noirengineer · Post by **noirengineer** » 09 Apr 2009, 16:47

Gila_Crisis wrote:nice, i don't know why but this reminds me a lot of a Colosound Overdrive

That's it. but i wonder if it's a slightly modified circuit or 100% clone.
anyone have any clue? I never had a coloursound OD so I'm not too
familiar with it's circuit, other than the prescription that is..
the PCB is pretty shabbily etched imo, and I find the pots values
are a bit too responsive... especially the volume control, a slight turn
will either make it completely silent or the loudest explosion of volume ever.

I really wish it had a 3pdt and an LED too.. that's another gripe..
the pots are way to easy to turn, they have little physical resistance,
sometimes when you stomp on it, especially in a dark venue or whatever,
you'll accidentally turn a knob or two, it sounds awesome though..

Neil young in a box

ekajjake123 · Post by **ekajjake123** » 12 Apr 2009, 23:27

If anyone decides that it's different, please do a layout! I was going to build the colorsound soon as I've heard it's basically the PE RX, which is what I'm looking for.

Here's a perf of the Colorsound, if it helps:

cpm · Post by **cpm** » 13 Apr 2009, 09:41

i am breadboarding the CS overdriver, it sounds quite good

i find the gain pot very extreme, it doesnt get any gain until fully turned up, and there it raises to maximum gain, i dont think even a C-type would soften that.
My solution is removing R4 (12k), this way the gain pot is more usable, and goes from a slight overdrive to full gain and all in between. At full gain is a little less compressed, but in a good way to my ears

noirengineer · Post by **noirengineer** » 14 Apr 2009, 19:46

cpm wrote:i am breadboarding the CS overdriver, it sounds quite good

i find the gain pot very extreme, it doesnt get any gain until fully turned up, and there it raises to maximum gain, i dont think even a C-type would soften that.
My solution is removing R4 (12k), this way the gain pot is more usable, and goes from a slight overdrive to full gain and all in between. At full gain is a little less compressed, but in a good way to my ears

that's kind of what of love about it's charm and such..
like from 0 to 70.. really nice warm jolt to the tubes,
like a basic volume booster, then go from 70 to 100 and
it goes in to fuzzed squishy sounds

Naz Nomad · Post by **Naz Nomad** » 14 Apr 2009, 20:22

Why do I have a sudden craving for ...

puppiesonacid · Post by **puppiesonacid** » 14 Apr 2009, 23:41

you post out loud you know that right?

noirengineer · Post by **noirengineer** » 15 Apr 2009, 18:45

last ive seen it actually was a bit.. its prob under a pile of clothes @ my g/f's
if memory serves looks about right; may be a resistor or two off.

noirengineer · Post by **noirengineer** » 19 Apr 2009, 17:27

Here's a bit of my recently tested Prescription RX
it does differ from the vero above.. the biggest ones
being the 2 diodes not listed (i'm not familiar with them, and
i'm kinda hungover at the moment, so i will have to clarify this
again later when i'm more sober eyed.) but so far, from what i can see
and so far from my readings i've got something like this... help me out.

_________________________________________________________________________

Bass Pot 100K LINEAR Alpha 6E3
Treble Pot 100K LINEAR Alpha 6E3
Drive Pot 2K LINEAR Alpha B2K
Volume Pot 200K LINEAR Alpha 5J3

(L TO R)
R1 500K
R2 500K
R3 10K
R4 500
R5 150K
R6 100K
R7 1.8K
R8 500
R9
R10
R11
R12
R13 4.7K
R14 32.7K

D1 220 3 (J?) / 50V
D2 1000 T / 50V

T1 2N3704 ECB
T2 2N3704 ECB
T3 2N3704 ECB

noirengineer · Post by **noirengineer** » 19 Apr 2009, 18:54

Can anyone ID those two diodes there..?
there is one on top side of board, one on back