The circuit presented is a documentation for radio amateurs from 1978. Implemented with common CMOS and linear components, it indicates CMOS logic levels.
This circuit is from a Popular Electronics from the 90s. Its gain is 22 dB and can be used as a...
This Rytron transmitter was published in a 1953 book. The circuit can be implemented with a BC558...
The purpose of this circuit is to keep the other phones on the same line muted when one is used....