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 metal detector circuit uses an AM radio as an indicator. The radio is placed off-station and tuned...
This oscillator produces a modulated signal using a unijunction transistor. We found it in an...
This transmitter was obtained in a 1953 publication. The original transistor was made of...