Wednesday, March 02, 2022
Kijimi VCA RC Filter Demo
video upload by Sonic Sand Castles
"This is an A/B test of an RC filter PCB I made to filter out unwanted amp envelope artifact/aliasing noise on the Kijimi voice cards due to low-res DAC amp envelope outputs going into the VCA CV inputs, compared against the default AS3360 DIP ICs.
The PCBs I made just put an RC filter in front of the VCA CV inputs of AS3360D (SMT version) ICs.
The RC filter values are:
- 1k ohm resistor
- 0.47uF capacitor
This was just a quick reversible solution I put together, no direct soldering required on the voice cards or main board.
The first section demonstrates the unwanted aliasing using the default DIP ICs compared to the adapter PCB which filters it out.
The second section demonstrates how the adapter board reduces the strength of the envelope (which is a drawback, but I prefer that over the artifact noise)."
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