• Testing the Theremin effect and a LFO

    Dr. Cockroach3 days ago 0 comments

    October 25, 2020 - Video of current tests of the LFO and perhaps make a Passive Optical Theremin

  • First test scale

    Dr. Cockroach10/14/2020 at 22:09 3 comments

    October 14, 2020 - First test scale using the very basic keyboard. I still need to add the sharp/flat keys but this taking shape.

  • Tuning and Keyboard Module

    Dr. Cockroach10/14/2020 at 15:22 0 comments

    October 14, 2020 -  Starting the layout of the tuning pots and keyboard switches.

  • The Basic Circuit

    Dr. Cockroach10/14/2020 at 10:53 0 comments

    Here is the basic circuit I am using. Pardon my poor sketch ;-)

  • Switches for the keyboard

    Dr. Cockroach10/13/2020 at 21:07 0 comments

    October 13, 2020 - I found some very small switches in my junk box that will do for a small push button keyboard. Not ideal but good enough for testing. These were from a printer/copier that my landlord gave to me so why not make use of some of those parts. This will be a single octave from C2 through to C3 plus a extra key on the left for a knob controlled tone. Right now the oscillator has a hard time reaching C4 so going with the lower octave. Besides I love the deep rich sound this circuit has down there :-)

  • The perfect multi-turn pot ???

    Dr. Cockroach10/13/2020 at 12:44 3 comments

    October 13, 2020 -  I have had this old TV tuner board in my junk box for about thirty years and I think these 20K pots will be of great use in the tuning of the keyboard part of this project. These pots take about 100 turns for full range. Very fine tuning indeed ;-)

  • How it sounds in the raw so far

    Dr. Cockroach10/11/2020 at 18:53 0 comments

    October 11, 2020

    This is just a sample of the deep low sound from the Patrick Oscillator. Very low frequencies and sounds great.