144 MHz preamplifier (CB22013E)

Found in an old English documentation, this circuit is intended to amplify signals in the 2-meter ham radio range. Coil details are not provided.

Voltage Comparator (CB6549E)
This circuit uses amplifiers from the 60's American company Microlin. The circuit can be designed...
SCR 600 W Control (CB13900E)
This power control from Motorola's 1971 SCR Power Control Fudamentals can control full wave loads...
Audio signal generator (CB8044E)
Despite being from a 1969 publication, the transistors used have current equivalents such as BC548 and...