The test bed is made

A project log for Making music with relay chatter

One of the Hackaday 2018 entries is to make a musical instrument of sorts and I thought of the sounder used by Morse Code operators

boelens-lelandBoelens, Leland 09/25/2018 at 07:090 Comments

I assembled the components onto the prototype test bread board using point to point wiring.

This test bed has 3 adjustable voltage switching supplies. The two outside supplies are for the relays and motors and are set to 3 volts and 12 volts to start and this may change. The center supply is adjusted for 7.5 volts to power the pro mini thru the RAW power pin.

The pro mini PWM pins are wired to 6  FET s with one digital output driving the seventh FET. If I need the 6 PWM pins they are ready to go, and if I need another digital output I can program one of the PWM pins as a digital output.

The A2 and A3 pins are wired to 2K ohm trim pots to provide a user adjustable input level. I may use them for speed and delay adjustments.

NOW, Let the programming and testing begin.