This CMOS logic-based circuit was found in the April 1974 issue of Radio Electronics magazine. The circuit is based on a period display and has hour and minute indications.
This circuit changes the wave shape of a square signal according the values of C1 and R1. Other...
This circuit provides a reference voltage for calibration. He uses a diode in a small thermal...
Found in an Electronic Design from the 80's, this circuit monitors the charge of a 12 V battery....