This high-gain circuit was found in an American publication from the 1990s. The circuit can use general purpose transistors and powered from a source or battery.
We found this circuit in a Popular Electronics of the 90s. Its purpose is to detect when it locks...
In the circuit shown in the figure, we add a capacitor (C2) and a resistor (R4) at the base of the...
This circuit, from a 1975 technical documentation provides a gain of 14 dB at signals from 500 kHz to...