This 300 Hz to 3.4 kHz filter was found in the May 1989 Radio Electronics magazine. The circuit requires a symmetrical power supply.
This General Electric circuit, in a documentation from the 1960s, allows the use of high...
This circuit is intended to apply the music signal from a stereo to a telephone line for the...
We found this circuit in an American documentation from the 90's. The circuit can be assembled with a...