This circuit with 4 transistors can receive signals in 6 shortwave bands. The circuit is from a Radio Electronics from May 1958. The output is for high impedance headphones.
The operational amplifier of this circuit is not very common today, because we removed the circuit...
Suggested by an American documentation for 1969 neon lamps, this circuit provides SCR control with...
We found this circuit in a 2005 documentation. The circuit allows the automation of a gate through...