When i first heard the sound of rainbow machine, I was totally shock :idea:
:slap: I searched everywhere but i could not fing any layout of it.
Ifound the schematic and PCB of rainbow machine on PedalPCB
But only the picture ,and only the front of PCB :hmmm:
By the way, i'm a 22 years old young man from CHINA :worship: ,i don't know how to shop on ebay
So i took a lot of time ,draw the circuit on the back according to the schematic of it. :thumbsup
this is first post here on this forum, I hope I'm doing this right.
Since nobody seems to have done this before and I was sick in bed for a week recently, I used that time to trace the schematics of the SansAmp PSA-1. One tiny part is missing and that's the mystery circuit inside the black box used for the CRUNCH and DRIVE. I assume it's based around yet another 072 dual opamp since there are +5V/-5V going into the black box. Anybody with an x-ray?
I wouldn't have bothered but this thing is noticeably quieter at idle than other Llama layouts I've built. The IC is a MC14049UBCP and all the resistors appear to be standard Llama value except for the circled one which if I'm reading the color bands correctly is a 15k or 16k but measures out at 74.8k (it's also late here and I've had a shitty day so the margin for error is pretty large). Anyway, I'm curious if anyone has thoughts as to why the new one is so much quieter. Enjoy.
The CrunchPlus has been on the YouTube demo circuit recently and I have one on the bench for tracing.
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Inset-1-2_900x.jpg
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As with any pedal that hides it's parts, it becomes a mystery which needs to be solved.... :hmmm:
In this pedal, the quad op-amp and two transistors were sanded down and four diodes had its labels removed. The parts were then painted gold. At least it was not gooped. :D With removing the paint, the diodes were revealed and the testing/readings of the transistors also...
{Q2 base-ground resistor value now corrected - see comment below}
The orientation of the electrolytic input cap looks odd to me. Nice sounding circuit, seems to be discontinued (at least, it's not up on the basic audio website pedal page).
Just traced this rather scarce Studio Electronics Wolftone Chaos. It's a weird octave up fuzz that was re-released/cloned by Malekko as well.
The transformer seems to be utilised purely as an impedance conversion device, and won't be adding much saturation (to my knowledge) as it is DC decoupled. All in all it's a very unusual octave fuzz and would make for a good clone.
The unit I traced this from must be an early one as the PCB had loads of mistakes that were corrected in a not so neat way....
Hudson Electronics has recently come out with a new version of the broadcast with two silicon transistors and a more striped down control set, in partnership with Ariel Posen exclusively for Andertons Music in the UK.
To quote Hudson Electronics website
At the heart of the Broadcast-AP – as the name may suggest – is the same circuitry as the Broadcast. A class-A discrete, transformer-coupled circuit, designed to saturate in a unique way reminiscent of certain recording and broadcast...
I hope I'm doing this right. I checked the components in my recently acquired Gain Changer SR (PCB is labeled SR and V4) against a V2 gutshot found online and the 2012 schematic on Barber's site to find the component changes for the SR. I'll list only the components that have been tweaked:
Looking for the schematic of of the Barber Linden EQ.
I seem to remember it was available somewhere, sometime, but can't find it.
Maybe someone has it?
Gutshots to follow. Apparently the Ge diode is Russian NOS, but the one I looked at appeared to have a transistor part number. The LED may also be flipped around, which means it would have zero effect on the sound, but it was hard to tell.
Note that there are 3 cuts on the layout that are hiding under resistors (560R top left, 4K7 bottom, 10K bottom right).
If anyone has this I'd like to see good gut shots. I can't find hardly anything on this. I know Brent Hinds of Mastodon had them make these. He said its a od that can blow the tubes in a preamp. Doubt that's true but I still wanna see what's inside
Hi everyone, I've been a member here for years, but apparently this is my first post. Anyway a friend bought me an LA-1A to reverse engineer and clone because he wants one smaller and with more color options (a bit superficial, but I won't complain). I traced it all out and I'm pretty confident that my trace is accurate to what I'm seeing on the board. That being said I've never designed a compressor before, so I was hoping someone with a bit more experience in compressors could take a look at...
I know, it's not even released yet, but I thought I'd post a request so that:
1) folks would be aware of this pedal, and
2) maybe someone would be inspired to get one and trace it out
very cool pedal! they call it an overdrive pedal but it gets very fuzzy at the top of the drive knob, very tonebendery. what i also noticed was that the tone knob doesn't get shrill at the top, instead it sounds very GLASSY, even on my strat bridge pup. the guitar volume knob clean up isn't as great as they advertised, it does get clean at the '6' mark but it also gets very muddy. it doesn't do fuzz face...
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