This circuit was found in documentation from the 1970s. The transistor supports modern equivalents. L1 with C4 determines the frequency range of the signals that will be produced.
This circuit was found in an English magazine from 1978, but it is still current, just change the...
This circuit causes a buzzer to emit an intermittent tone when the temperature sensed by the...
This microcontrolled null adjustment for operational amplifiers was obtained in a Linear...