This circuit was obtained from an American documentation from the 1970s. Information on the current obtained and the winding of the transformer is not given.
Linear Technology's LT213 circuit, which suggests this application in 90s documentation, is not...
This circuit is more elaborate than the previous one, employing an integrated amplifier circuit of the...
This circuit was found in a PE Hobbyst Handbook from 1992. The second oscillator is a VFO. The...