Digitally-controlled oscillator

The microprocessor-controlled oscillator has a 8159 to 1 frequency range covering 2 Hz to 20 kHz. An exponential, current output IC DAC functioning as a programmable current source alternately charges and discharges a capacitor between precisely-controlled upper and lower limits

The circuit features instantaneous frequency change, operates with +5 ±1 V and -15 V ±3 V supplies, and has the dynamic range of a 13-bit DAC.

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