This is the circuit for the HM-10ª, an instrument sold by Heathkit. The circuit is from a Radio Electronics from May 1963. The indication is by an analog instrument.
This circuit is from a 2001 publication. The balun transformers are of the commercial type for TV...
This circuit is from an old publication from the 1950s. The circuit uses germanium transistors but can be...
This amplifier, from the 1990 Philips Databook, is suitable for automotive applications. The...