This circuit is from a 1965 General Electric manual. It uses components from the time that admit equivalents. The SCR can be the TIC106 and the LDR of any type.
This circuit is from an 80's electronic component manual. It has the way to simulate an inductor...
This basic amplifier using complementary transistor in the output sources about 0.5 W of good...
This circuit uses one of the first commercial transistors, availble in 1958, year of the...