This circuit of dozens of watts uses germanium transistors and the critical components are transformers. The circuit is from the 1960 Mullard transistor application manual.
This circuit was found in a 1977 Radio Handbook. Equivalent transistors can be used. The formula...
This circuit was found in a Popular Electronics from the 90's. The circuit has gained 10 to 20 dB...
The purpose of this circuit is to increase the sensitivity of a common multimeter in its voltage...