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 fully passive circuit was found in documentation from the 1970s. The circuit uses an optical...
This circuit was suggested by Linear Technology in documentation from the 90s. The circuit applies to...
The purpose of this circuit is to keep the soldering iron at a constant temperature, thus saving...