This circuit uses a 555 (according to the diagram) to generate 50 ms tone bursts at a frequency of 1.5 kHz. The circuit is from an 80's Electronic Design.
This circuit is from a 1976 documentation. It makes use of isolated gate MOSFET which is already very...
This circuit was obtained from a Popular Electronics of the 90s. The SCR is of any type and the...
This circuit behaves as a voltage controlled resistor and can serve as a small load. The circuit is...