This circuit was suggested by Texas Instruments in a 1980s documentation. The transistor must be equipped with a heat sink. The transformer has 10 A secondary current.
Varicap or varactor is the basic component used in this circuit of an American 80's documentation. The...
This rapid response amplifier uses an integrated one that is not common today but can be...
Found in Popular Electronics from the 90s, this circuit powers a warning lamp when the load is...