Found in a 1967 Electronics World, this preamplifier uses an integrated circuit from that time, difficult to obtain today. The maximum frequency is 15 kHz.
This experimental good sensibility radio was obtained from a 1968 magazine. The magazine no longer...
This flasher was originally intended for Christmas tree lamps. The circuit is from 1974 and uses...
The transmitter described is intended for radio amateurs, providing a maximum power of the order of...