Crystal converter (CB7327E)

This circuit was found in a Popular Electronics from the 90's. The circuit can be used to convert signals to frequencies up to 25 MHz.

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Active Antenna (CB16519E)
This booster for listening to signals in the range from medium waves to 30 MHz was found in a 1998...
Simple Touch Switch (CB15424E)
In the figure we show our first circuit that consists of a simple touch switch capable of driving a...
Experimental TTL Transmitter (CB15628E)
Using a 7400 we have a short-wave transmitter from 4 to 9 MHz, shown in the figure. The coil...