This circuit uses CMOS integrated circuits and can operate with CMOS logic from 3 to 15 V or TTL with 5 V power. The power is obtained from the circuit under analysis.
This circuit for measuring very low currents was found in an American documentation from the...
Found in Popular Electronics from the 90s, this circuit is based on a PLL567 and employs high-end or...
This circuit is from 1976 Radio Shack documentation. It detects when rapid variations in the light...