This 455 kHz IF calibration circuit uses a 4,096 MHz crystal. The circuit can be powered by voltages from 5 to 9 V.
Found in na 1970 EDN this circuit has a parallel regulation providing a symmetrical output of 15 V....
This circuit is from an American documentation from the 50's. The transistor is the CK721, and the...
The figure shows how to use an operational circuit as a voltage divider. The circuit is from a...