AM Utility PCB's

Overview Here is a collection of usefil "utility" PCB's that can help any Synth DIYer complete his/her project. We have called them Sub Modules - enjoy!

Push Button Sub Module(PBSM) The usual switch type for analog synth modules is the toggle, as it is easy to mount and connect. Square or round momentary push buttons with in-built LED's are used on commercial synths, but they are a bit more difficult to use with analog modules.

Not any longer! The PBSM circuit supports the control of four analog module features via momentary push buttons. The push buttons are easily available and are the same as used on many E-mu, Oberheim and SCI synths of the late 1970's. The push button controls a simple CMOS flip-flop which toggles a DG403 analog switch on and off. The switch is DPDT and can handle audio or control signals up to +/- 15V. A 3mm LED within the button provides visual feedback of the switch state, or it can be jumpered to be controlled externally (e.g. LFO rate).

The PBSM consists of 2 PCB's mounted back-to-back, with the switches mounted on the outer board and the logic mounted on the inner board. Four switches are mounted horizontally, next to each other, so only one panel cut out is needed in addition to the 2 mounting holes.