This Pierce oscillator was found in American documentation from the 1980s. Transistors support modern equivalents.
Found in an Electronics World of 1968 this circuit has a 40 to 12 000 Hz bandwidth providing a 1.9 Vpp...
This amplifier was obtained in an Electronics Now based on the LM1875. The circuit must be powered...
This timer controls two relays, each with a different timing, activated separately. The circuit is from...