Found in American documentation from the 90s, this circuit can be used as a shield with the replacement of the output optical coupler. The operational also admits equivalent.
Active with the output at the high level, this oscillator was found in November 1984 Radio...
The coil and sockets of this circuit found in a QST depend on the frequency band that is intended...
We found this circuit in an old American documentation. The operational amplifier is from the time...