This powerful motor control was found in a Philips publication from 1970. The components are from that time and the circuit was designed for the 220/240 V power grid.
Using a BA1404 integrated circuit this small FM stereo transmitter was found in a Radio...
The operational amplifier is not very common today, but in its place an equivalent, even of...
This circuit was found in the February 1993 Radio Electronics magazine. The frequency depends on...