This filter is from a 1977 publication. The circuit employs three 741 or other operational amplifiers. The supply must be symmetrical and the components with (*) are low tolerance.
This micro FM transmitter or wireless FM microphone makes use of a ceramic capsule as a microphone or...
The voltage of 30 V indicated in this project, shown in the figure depends on the diac used. It...
This circuit is intended to drive bistable relays and can be used as a shield for...