Chalumeau w/o Fuzz

falco_femoralis

Active member
Hi all, here's a Chalumeau build. I made this without the fuzz by clipping pins 1 and 8 off the LM386.

Here the PCB is made and I'm beginning to populate the wiring. I went with a diffused yellow LED. I forget which LDR I used but I believe it was one of the Tayda ones. I left the top two pots out for now.
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Holes are drilled. I'm squeezing this into a horizontal 1590b
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I fit the DC jack in between two of the pots and above the circuit board. The prongs have to be this way and I will fit heat shrink over the ground wire so it doesn't contact the circuit board.
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I had to coax the pots into making the board fit the way I want. It was pretty tight, but it'll make sense when you see how it fits with the switch. After this I reflowed the pots' solder joints. I temporarily mounted the board and got an idea of where the LED should be, and I hot glued it to the back of the board.
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Now it's coming together. I feed the switch wires under the board and around to the back of the switch. I wire up the off board pots - I had the foresight to order solder lug style this time. I use a single wire for all the grounds and it took some planning to make it work without making a mess.
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And that's the wiring done! It's a tight fit but it's laid out simply. I would have liked to run more of the wires under the board but there just wasn't room
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And here's the top! I'm experimenting with labels and I think these came out pretty good. I like the 1590b size over the 125b and I'll do whatever I can to use them instead.
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I like the sound. I was looking for something to replace my Low Tide, which I never really bonded with. This thing is just a bit of weird. The Tracking control is interesting - it's an envelope filter that detunes more the more intense the signal is. I played with the pedal briefly to make sure everything was working but I'll have to spend some more time with it. Again, I omitted the fuzz because I'm not fond of the LM386 style distortion and I wanted something that would add a lofi augmentation to my clean and light overdrive sounds.
 
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Cool mod. Original (and challenging) layout. Great write-up. I love this sort of build report. Well done! I wasn't interested in this one but the no fuzz mod has me curious.
 
I've been playing with the pedal for a bit and have noticed a few things: when I turn the Delay knob all the way CW, the pitch bend effect stops. Taking a look at the schematic, it looks like when this happens the signal is allowed to bypass the LDR entirely. I think I can add a resistor on one side of the pot so there is always at least some resistance when the Delay knob is at its max (min?) point.

Also, I'd like to add a feedback control. I'm going over the different diy schematics trying to research what to do. There is just enough space in the enclosure to do so, on the side, kinda like the original.
 
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