This circuit for the 40 MHz band was published in Radio Electronics magazine in December 1957. Its purpose was to monitor the signals of the Russian satellite launched at the time.
This circuit is from the Motorola Linear Databook of 1990. The values of the components depend on the...
This low power audio amplifier was found at 1992s Popular Electronics. Transistors are general...
Found in a 90s Electronics Now, this circuit multiplexes audio signals for stereo transmission. The...