This circuit is from documentation from 1965 but can be easily implemented today using modern transistors. We can use BD136 for Q1 and TIP42 for Q2. The TIP must be equipped with a heat sink.
This circuit generates a linear sawtooth signal with frequency that depends on the capacitor next...
This circuit is from 1977 documentation, and high current equivalent transistor must be used. The...
This circuit that can be used as a three-tone domestic bell has a traditional configuration that...