We find this circuit in American documentation from the 1980s. It consists of a frequency folder using a varicap. The capacitors and coils depend on the frequency of operation.
This circuit was found in a 2005 Linear Technology application manual. The circuit monitors the...
This circuit, which can act as a shield, was found in a 90’s Radio Electronics. It enables a power supply...
Found in na 1970 EDN this circuit has a parallel regulation providing a symmetrical output of 15 V....