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.
When the input voltage is higher than 2/3 of the power supply voltage the green LEDs glows. When...
This circuit was found in the December 1971 issue of Radio Electronics magazine. The circuit is...
The circuit of a 1968 publication can be implemented with more modern transistors such as BC548 for...