The presented circuit uses an opto-SCR. We found the circuit in the GE semiconductor manual. Equivalent triacs, depending on the load current and voltage, can be used.
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...