This circuit is from a 1990s publication by William Sheets. The circuit consists of a stage whose gain is adjusted according to the signal intensity.
We found this circuit in the Electronics Experimenter Handbook magazine from 1993. L1 has 2 = 2...
This circuit, from an old Argentine publication, provides 6 W of output from an output of less...
Unlike the previous detector circuit, this includes the inverter not requiring a high voltage...