This filter is from the Linear Applications Handbook of the National Semiconductor of 1994. However, it can be used with other operational and modified to operate with other frequencies.
This FM micro transmitter was found in an 80s spy book. The circuit can work with equivalent FETs...
Other operational amplifiers series, such as the MC34072, MC34074, MC35071, MC35072, MC35074 d...
This circuit was obtained in a General Electric documentation from the 80's, and can be used as a...