Found in an Electronic Design from the 90's, this circuit supplies voltages according to the indicated component values. The integrated circuit is from the time.
This 2000 circuit can work with one of the many infrared remote-control transmitters described in this...
This receiver for listening on the phone was found in a Japanese magazine in 1967. The circuit uses...
The circuit shown in the figure is suggested by Intersil (www.intersil.com) and makes use of the...