The filter presented is from 1994 but can be implemented with a more modern equivalent. We found this setting in the National Semiconductor Linear Applications Handbook.
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...