We found this circuit in the Radio Electronics magazine of December 1972. It generates signals in 6 frequency bands, being indicated for experimental applications with TTL circuits.
The circuit we present is that of a good power ultrasound generator, as it uses a transistorized output...
Indicated as an amplifier block for various applications, this circuit was obtained in a 1966...
This circuit was found in a 1974 publication. It provides a tone indication of the temperature sensed by...