A to Synth

Wednesday, September 24, 2025

Cleaning up the UI

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I'm about to make a prototype of the UI, and have been cleaning up the grid a bit. This is what it looks like right now:   Inspired by t...
Monday, September 22, 2025

Pot and button boards tested

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I finally got around to testing the potentiometer and button breakout boards yesterday. They seem to work just fine. Button board with integ...
Friday, August 29, 2025

Adding overdrive to the ladder filter

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If I need to add overdrive to the ladder filter, I can free up one CV channel already routed to the board by using the same CV for trimming ...
Thursday, August 28, 2025

Little Phatty overdrive

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I can't remember if I've written about this before, but I've certainly looked at it. EDIT: Turns out I did, in great detail! htt...
Monday, August 25, 2025

JX-8P cross modulation

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I've visited this before, but I got a bit confused when looking at the circuit, so here is some details of what is going on. JX-8P cross...
Wednesday, August 6, 2025

Testing frequency changes related to pulse width

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Update: Solved - it is not pulse width that is the issue, it's the pulse amp CV, just as in the waveshaper   The AS3340 suffers from a p...
Friday, August 1, 2025

Improved CV inputs for VCO

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As mentioned earlier, I'm not satisfied with how the VCO CVs work. Noise on the CV probably has a higher effect on the pitch than necess...

Cem3340 four trimmer tuning

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I can’t remember if I’ve written about this before, but there is apparently a way of tuning the CEM3340 (and AS3340) that is done in a singl...
Monday, July 28, 2025

Lm13700 equivalents

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The  AK317DC and NE5517 are transconductance amps compatible with the LM13700. Nice to know!
Monday, July 7, 2025

Debugging VCO Pitch unstability continued 4 - selected solution

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I've officially come to the conclusion that I'm not able to make the noise level any better at the moment. I've ended up at a po...
Saturday, June 14, 2025

Debugging VCO Pitch unstability continued 3

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Aaaaand testing continues. NB: Most measurements are now with the VCO connected to power ground. Reducing pw to 25% to see if it affects the...
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About me

Joakim
I'm a mostly self-taught electronics enthusiast. I like the process of creating hardware from scratch, and usually end up not using the finished product once it works. I mostly work in the field of audio and synthesizers and do both analog and digital designs. My big project at the moment is a digitally controlled polyphonic synthesizer. In between this I do smaller things like the X68B01 keyboard controller clone for the Prophet VS, the MPG-200 midi enabled controller for the Roland JX-3P and an upcoming kit for converting analog joysticks into midi controllers. My background is as a computer engineer, with some classes in analog/digital design. I have two beautiful children, Roland and Synthia (or rather, that would have been their names if the Wife did not wildly object. I did sneak OSCar past her though, so I'd say I've been fairly successful).
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