The operational amplifier used in this circuit is uncommon nowadays. We obtained this circuit from documentation from the 1980s, but it can be adapted to use more modern equivalents.
This circuit uses a piezoelectric transducer to produce sounds like a buzzer. Frequency is...
This sophisticated sinusoidal audio signal generator uses a Wien bridge configuration with an...
This 7400 TTL circuit has a memory, keeping the LED on when a pulse is detected. The circuit must be...