This circuit is from an old American documentation from the 70s. Transistor 2N3904 can be replaced by BC548. The relay must have 100 mA of maximum current.
This circuit can be used with the 27 MHz transmitter from the previous circuit in a remote-control system...
The Texas Instruments PLLatinum ™ synthesizer can be obtained from Mouser Elecgtronics to generate...
August 2017 - Mouser Electronics is announcing the availability of the new ON Semiconductor CMOS...