This circuit was found in an American documentation from the 90's. It switches a continuous voltage obtaining an AC voltage at the output of approximately 1 kHz.
This low frequency oscillator with an operational amplifier of type 741 has adjustment of the mark...
This circuit was found in a Popular Electronics from the 90s. Transistors are general purpose...
The AT21CS11 memory device offers an extended voltage range to accommodate lithium-ion battery...