This amplifier was found in a 1957 Rayrtheon documentation. The circuit can be fitted with a BC558 transistor. Driver and output transformers can be obtained from unused transistor radios.
This frequency divider with SUS was found in General Electric's 1967 documentation. Similar...
We found this circuit in a 1982 publication. This transmitter sends its signal to any AM radio...
We found this circuit in an English magazine from 1976. The magazine no longer exists, but just...