This 4-stage circuit has a voltage gain of 10 and negative feedback. The circuit was found in an old MIT publication.
This transmitter generates modulated infrared radiation and can be used as the basis for a remote...
This circuit, from the 1990 Motorola Dataar Databook, can use any LM139 series comparator. The circuit...
Up to some minutes intervals can be obtained from this circuit. The circuit can use a lamp (or...