This bench circuit generates signals with frequencies determined by the settings and selected capacitors. The circuit was found in a Radio Electronics from January 1959.
This circuit was obtained in an old documentation, receiving the medium wave range. L1 has 20 + 60...
This circuit is from an old documentation from the 70s, so the transistors used are not common....
We found this circuit in a publication for radio amateurs of 1976. The operational amplifier is a...