Found in an Elektor from the 90s, this circuit simulates a rotary switch that provides a BCD output from a 1 pole x 10 common position switch. The circuit can be powered by voltages from 3 to 15 V.
This receiver was found in the Radio Electronics magazine of March 1953. It tunes to the medium wave...
The LED is optically coupled to the LDR1 sensor to provide negative feedback to the circuit and...
The circuit presented was found in a 1988 documentation. It consists of an alarm siren that it...