Free circuit schematics - wiparat.com

This Circuit is a simple Analog to Digital Interface with a capability of 10 to 12 bits resolution.
10 bits means 1024 counts or parts of a full scale FS which is close to 3-1/2 1999 counts.
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Read more : VCO with LM331

Transmitter circuit diagram:

Transmitter parts:
R1,R3________100K 1/4W Resistors
R2___________47R 1/4W Resistor
R4____________5K 1/2W Trimmer Cermet
R5___________12K 1/4W Resistor
R6___________10K 1/4W Resistor
R7____________6K8 1/4W Resistor
R8,R9_________1K 1/4W Resistors
C1___________220nF 63V Polyester Capacitor
C2____________10nF 63V Polyester Capacitor
C3_____________1µF 63V Polyester Capacitor
C4,C6__________1nF 63V Polyester Capacitors
C5_____________2n2 63V Polyester Capacitor
C7,C8_________47nF 400V Polyester Capacitors
C9__________1000µF [...]