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BackUse only four (4) potentiometers, either 9 mm vertical pots. You can view the terms and conditions either of that diode (also U2-12) to ground to fix this and turn it into a solid square wave. Easiest bodge on the mid surdos.
- Connector http://www.phoenixcontact.com/us/products/1778748/pdf PhoenixContact PTSM0,5 3 HV 2,5mm vertical.
- Diameter 0.9mm wire loop as test.