Penta

Download assembly manual here. (2.1MB)

Download schematics here.

15V power modification

No changes needed. RYO Penta will run on 15V if needed.

CV out Volt modification

For 0-1V CV use as close to 20k for R17 as you can get.

For 0-2.5V CV use as close to 50k for R17 as you can get.

For 0-5V CV (original) use 100k for R17.

For 0-7.5V CV use as close to 150k for R17 as you can get.

For 0-8V CV use as close to 160k for R17 as you can get.

For 0-10V CV use as close to 200k for R17 as you can get.

Replace reset in with hold in

This should make the reset input into a hold input instead.

Download schematics for the RST to HLD change modification here.

To replace the reset (RST) input with hold (HLD) input you need to remove R5 from PCB1. Indicated in the picture above.

On PCB2 you solder one end of R8 to another pad next to it and connect a 10k resistor between the now unused pad for R8 and the hold pad intended for homebrew experimentation and expansion. Indicated in the picture above.