Found in American documentation from the 90's, this circuit can be implemented with modern equivalent components. Observe the symmetrical power supply.
This circuit provides an audible signal when testing a TTL circuit. The circuit is from an old...
The power of this small amplifier reaches 75 mW per channel depending on the voltage and the load...
This circuit uses the 741 Operational Amplifier to drive two LEDs. The LEDs indicate the signal of...