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 well-known siren configuration using complementary transistors is from a 1980s documentation. The...
This circuit was found in a Popular Electronics from the 90s. Transistors are general purpose...
This generator is more complete than the previous one, being able to generate pulses as indicated...