The great "I'd like to see the guts of" thread

All about modern commercial stompbox circuits from Electro Harmonix over MXR, Boss and Ibanez into the nineties.
Transistor Tuner
Posts: 1167
Joined: 04 Apr 2009, 23:42
Has thanked: 1114 times
Been thanked: 721 times

Post by Manfred »

Why does the EDIT-Button not work?

I see now, it works together with the resistor switching by S1.1.

User avatar
Solder Soldier
Posts: 157
Joined: 25 Feb 2017, 20:58
Has thanked: 14 times
Been thanked: 141 times

Post by temol »

Manfred wrote:I see now, it works together with the resistor switching by S1.1.
Exactly :)


User avatar
Chuck D. Bones
Posts: 3
Joined: 17 Dec 2017, 16:40
my favorite amplifier: Marshall 1967 (actually the EARTH copy)
Completed builds: One-knob fuzz from P.E. Feb 1968 - 1st build
IC version of Big Muff (before EHX ever marketed one)
Custom flanger pedal
EQD Hoof with added mid boost switch (PedalPCB Ungula)
Boss DS-1 with seeing eye mod, 1st-stage gain switch and tone mod
Shaky Jimi modded for improved speed control range and throbbing LED
Boss CS-3 with cap upgrades
Friedman Dirty Shirley (PedalPCB Brown Betty) - most recent build
Tweaks to some OOP Monoprice distortion pedals
Location: Somewhere in L. A.
Has thanked: 7 times
Been thanked: 1 time

Post by Chuck D. Bones »

temol wrote:It's a DPDT (SW1.1 and SW1.2) on/off/on switch. So in a middle position C7 is disconnected.

I see something that looks wrong. IC1.2 is supposed to be a mid-boost stage, but R30 is so large that the mid bump is barely 1dB. R30 is at least an order of magnitude too large. I'm guessing R30 is more likely 10K. The Sanguine has the same problem. Has anyone actually measured these resistors? I know surface mount resistors are hard to decode sometimes.

- Chuck

Breadboard Brother
Posts: 64
Joined: 25 Sep 2015, 18:40
Has thanked: 1 time
Been thanked: 6 times

Post by pervyinthepark »

EHX Cockfight pl0s?

Posts: 2
Joined: 26 May 2020, 07:21
Been thanked: 1 time

Post by Cyberjazz1521 »

Would love to see the inside of a Gamechanger Plasma Pedal

Posts: 19
Joined: 15 Dec 2017, 14:42
Has thanked: 6 times
Been thanked: 7 times

Post by Tomrcarre »

If anyone has it I'd love to have a look inside the lovepedal mkIII, supposedly a take on a tonebender MKI with silicon transistors. I'd love to see how they alter the circuit to get it to perform consistently!

Post Reply