We found this circuit in a 1965 magazine. The circuit can be assembled with current equivalent transistors and the precision in generating the frequencies depends on the tolerance of the capacitors.
This circuit is suggested by National Semiconductor in its Linear Applications Handbook. It makes...
A frequency range determined by the network of resistors and capacitors with negative feedback and input...
We found this circuit in a Radio Shack documentation from 1977. The circuit serves for a link of...