Chalumeau

[fontoponto]

Build Rating

5.00 star(s)

The chalumeau of the guitar world.

I made an attempt to make the pedal switchable without the fuzz. I was only partially successful. I may have to solder a pull-down resistor to the input, I think I read about it somewhere.
Pin 1 and 8 of LM386 have been bent up/broken off and are connected via a switch. When the fuzz is on it’s adjustable by potentiometer "Gain" between Pin 1 and 8.

The supplied LED that was supplied in my kit was somehow not bright enough to make the effect really wobbly. I then installed sockets and after some tinkering I finally ended up with an LCR0203 optocoupler.

"Octobeer" is a reference to the Oktoberfest after I went there two weeks ago with my daughter. It was a visit without a single beer and the craving for one as well as the drunken sound of the pedal made me come up with this beautiful name.
Unfortunately, I only realized at the end that I didn’t delete the drill marking on the illuminated beer mug.... The LED needs to be attached more professionally somehow.
And I still want to order yellow knobs.

Nice pedal. At that price you get a simple fuzz with delay and the possibility of sounding drunk.

 

[leadfoot]

I can't completely see what you did with the fuzz / clean switch, but looking at the Chalumeau schematics, could you run pin 5 of the lm386 to one pin in a 3-pole on/on switch and the clean signal into the board and have the output of the on/on switch to pin 5 on the ic connection?

I think that would give you the choice between clean and fuzz that you're looking for.

Really cool build! I like the graphics!

 

[fontoponto]

Thanks for the kind words and thanks for asking!
I spotted a mistake while trying to explain...

This is how I did it:

• I lifted pin 1 and 8
• connected switch pin 2 (red) to the bottom of the pcb where the ic pin 1 was connected
• connected switch pin 1 and ic pin 1 with pot pin 1
• connected pot pin 2 with ic pin 8

Switch pin 3 is the fuzz lift which should diconnect pin 1 and 8. I used a dpdt switch but only used one side when both must to be used.
This is the current state but when the clean is active the pot is still between pin 1 and 8 and affects the clean mode.


It should be like this to get the pot out of the clean mode:

Pin 8 can stay in the socket/pcb but then the trace between pin 1 and 8 needs to be cut. i couldn't do it because of the socket which I did not want to ruin.

There is a large thread on diysb

mid-fi clai(not) schematic!

mid-fi clai(not) schematic!

www.diystompboxes.com

 

[leadfoot]

Cool, thanks, I'll have to dig into the diysb thread. I've got this pcb on order and this would be a fun mod to add to it.