This circuit converts infrared pulses into audio and can be used in an experimental telegraphic link. The circuit is from a Popular Electronics from the 90s.
An OR gate can be implemented with an LM3900 transconductance operational amplifier. The circuit is...
This circuit was obtained in an old American documentation, remembering that the 566 is the double...
This circuit has a consumption of only 3.7 mA and can be installed in vehicles or objects for...