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 traditional two-tone alarm configuration with the 4011 integrated circuit was found in a 1998...
This circuit indicates the resistance of the skin of those who hold the electrodes. RV1 makes the...
The transistor of this circuit can be a BD135 or TIP31. The load current is given by resistor R1....