This circuit makes use of an operational amplifier from the 80's. The circuit can be implemented with modern transconductance operational and TTL logic working as a shield.
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...