This small signal amplifier circuit was found in Motorola's 1969 documentation. The FET and the transistor can be of any type and is battery powered since the consumption is very low.
This 25 W phase photo control was found in a 1965 General Electric publication. The circuit uses a...
This old oscillator using germanium transistors has a high impedance headphone as inductor to...
This simple half-wave control using an SCR, which may be TIC106, has been obtained from a US...