Obsolete diy audiophile boards
Colpitts-Clapp oscillator – Master clock for digital audio
Emitter coupled oscillator – Master clock for digital audio
Pierce CMOS oscillator – Master clock for digital audio
Emitter coupled combo oscillators – Master clock for digital audio
Oven for Emitter coupled oscillator with SC-Cut crystal
Dual in line adapter for oscillators
Oscillators power supply, clock switch and dividers
Push-pull low noise regulator