Page 73 - Build Your Own Transistor Radios a Hobbyists Guide to High-Performance and Low-Powered Radio Circuits
P. 73
MHz and then divided by 2 to produce a 537-kHz square-wave pulse signal into
pulse amplitude modulator U2F (via input pin 13 of the 74HCOS), which is an
open-drain output inverter. The output of U2F at pin 12 generates an AM signal via
C6.
