Found in a 1967 documentation this circuit can be applied to any operational amplifier. Components without values determine the frequency to which the circuit is tuned.
This small crystal microphone transmitter was indicated in an 80s spy book. The range depends on...
This circuit, found in a 1978 publication, converts 5 V into a symmetrical 15 V output under low...
The configuration shown in the figure is one of the most traditional when it is desired to produce...