Using an operational amplifier of the time, this circuit was obtained from a 90s Radio Electronics. The circuit covers the frequency range from 2 Hz to 20 kHz.
We found this circuit in a 2002 documentation. The frequency of each note is determined by the...
This circuit memorizes the input voltage that is then applied to the load in the form of a...
This interesting circuit found in American documentation generates a busy signal, without you...