This filter for frequencies from 300 Hz to 3.4 kHz was found in the February 1995 Radio Electronics magazine. Other operational amplifiers can be experimented, and the source must be dual.
This circuit can be used to drive relays, solenoids, motors and other loads according the...
The circuit shown in the figure modulates an infrared beam with a sinusoidal signal generated by a...
This BFO or OFB for listening to SSB (Single Sideband) signals was found in the January 1996 issue...