Colorsound Frankenflanger repair

About the Colorsound Flanger in an earlier post here. Found some schematics that helped rebuild the circuit.

Colorsound Flanger

Gut shot of the pedal in a working state.

Colorsound flanger repair
Colorsound Flanger

So pleased to here it producing flanging sound again. Here’s a short soundclip.

Repaired Colorsound Flanger

/Krister

Boss DD-3 repair.

Here’s another Boss DD-3. The pedal gives signal in bypass, with effect engaged there’s just dry sound.

Boss_DD-3 Repair
Boss DD-3 repair.

Someone has done some repair to the circuitboards power section seen in the upper left on this image.

Boss_DD-3 Repair
Boss DD-3 repair.

The Mode selector rotary switch out of the chassie for replacement.

Boss DD-3 repair
Boss DD-3 repair.

Old vs new rotary switch.

Boss DD-3 repair
Boss DD-3 rotary switch.

So what’s wrong with it. Found that C34 was broken, it did not pass any signal to the expander circuit. Had it replaced and got the delayed signal through the circuit, though at to high level and distorted. C31 was the cause of that problem. With C31 replaced the pedal works as it should. The tantalum capacitors C32 and C33 was also swapped with new ones as they do tend to fail in time. Checked and adjusted the high and low end of the Master clock frequency.

Boss DD-3 repair
Boss DD-3 repair.

Here’s the service notes: Boss DD2-DD3.

/Krister

Variable transformer.

Got hold of a powerstat, an old variable transformer from “The superior electric company Bristol Connecticut, U.S.A”

Variable transformer
Variable transformer.

Also found an old chassie donator. Runs 3A 0 – 230VAC and 0 – 320VDC. Nice for tool for tubeamps. VAC outlet on the right side and VDC on the front panel.

Variable transformer
Variable transformer.
Variable transformer
Variable transformer

/Krister

Nadine’s Distortion

A rare piece of non functional equipment, a Nadine’s Distortion on the workbench.

Nadines Distortion
Nadine’s Distortion

Gut shot, the circuit board in nice condition.

Nadines Distortion
Nadine’s Distortion guts

Component side.

Nadines Distortion
Nadine’s Distortion

The 6552 opamp was burnt, once replaced the pedal’s rocking again. Image of the circuit board with a socketed RC4558 as replacement for the 6552, the old electrolytic capacitors changed and a new battery clip installed.

Nadines Distortion
Nadine’s Distortion

/Krister

Boss AW-2 service

A Boss AW-2 on the bench for some service.

Boss Auto Wah service
Boss AW-2

Circuit board.

Boss Auto Wah service
Boss AW-2 circuit board solder side

Component side of the circuit board.

Boss Auto Wah service
Boss AW-2 circuit board

The pedal a bit cleaned up and recaped.

Boss AW-2

/Krister