A CW transmitter for 160 to 20 metres
The three-transistor circuit is shown in Figure 1. It comprises a crystal oscillator using a BC182 transistor which drives a 2N3866 power amplifier (PA) keyed by a ZTX750 PNP transistor. The oscillator and PA are coupled by a capacitor and resistor; this provides a very small amount of positive bias to the PA.
Figure 1 Transmitter circuit diagram
The oscillator can be used as a basic crystal oscillator ...