Simple Digital Theremin Circuit Diagram

Theremin circuit shown in this schematic diagram applies digital component, so we can call it a digital Theremin. This circuit applies  logic inverter 74C04 or CD4069 hex inverter and CD4046 phase-locked-loop (PLL) IC. The CD4069 logic inverter is functioned as a fixed-frequency oscillator with  frequency around 100kHz. The CD4046 is functioned as a variable frequency oscillator which is adjustable around 100kHz. The exact center frequency of the on-chip oscillator is driven by R4, C2 and R3. Here is the schematic diagram of the circuit:

Simple digital theremin

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