Found in a 90s Popular Electronics, this circuit uses components from that time, for a superheterodyne receiver design.
This circuit also detects IR, providing LED indication. The circuit is used to indicate humidity in...
This circuit uses a JFET, which may be of the type BF244 or BF245 and a PNP bipolar that may be...
This circuit can be used to directly control direct current loads or higher alternating current loads...