A to Synth

Monday, March 23, 2026

A little research into the startup problems

TL;DR: The DAC isn't starting up correctly, causing the CVs to either be the wrong value or to fluctuate. There are two weird things tha...

Wednesday, March 11, 2026

Soft start / inrush current limiter circuit

I've been searching for a working soft start current circuit, my voice cards frequently lock up/start self oscillating on startup and I ...

Wednesday, February 11, 2026

A deepdive into the JP8000 and TC170C140 ESP

This post sums up everything I've learned about the Roland/Toshiba TC170C140 ESP. Some of it comes from the Usual Suspects' present...

Sunday, February 8, 2026

JP80x0 midi to coefficient mapping tables

Pitch Midi Pitch 0 1555 1 1647 2 1745 3 1849 4 1959 5 2075 6 2198 7 2329 8 2468 9 2615 10 2770 11 2935 12 3110 13 3295 14 3491 15 3698 16 39...

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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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