Page 65 - Build Your Own Transistor Radios a Hobbyists Guide to High-Performance and Low-Powered Radio Circuits

v

R

Output

CW Signal
-----.....

FIGURE 4-8 Modulating circuit-voltage V is varied to provide pulse
amplitude modulation.

When V, the pull resistor's voltage source, is at a fixed voltage, the output would
see something like Figure 4-9.