This amplifier step for small signals can use any general-purpose transistor like the BC548. The circuit can be powered by voltages from 6 to 12 V.
Found in an English documentation, this circuit provides a 50 Hz signal according to the local...
This circuit provides 15W per channel and can operate with a single power supply. The circuit is...
This preamplifier for the 6 or 2-meter range was obtained from an American documentation from the...