The six square wave oscillators are tuned to following fixed frequencies: 119Hz, 176Hz, 214Hz, 303Hz, 363Hz and 666Hz. Each oscillator's volume can be set with an individual potentiometer.
The oscillator mix passes a resonant 12dB/octave lowpass filter that's cutoff frequency can be either controlled by a potentiometer or two photo resistors.
input for external power supply, 9-12V DC, center positive
1/4" audio out mono
117 x 83 x 55mm