1 kHz low pass filter (CB7579E)

This filter can be implemented with almost any operational. The power suppply must be symmetrical.

Auxiliary Telephone Bell (CB18817E)
This circuit for conventional lines was obtained in a 1996 documentation. The circuit uses common...
Negative ion detector (CB21001E)
This tube circuit was found in the magazine 73 for radio amateurs in an issue from the 1980s. Note...
bq21040 Manager of battery charger LiIon and LiPol (COM104E)
September 2016 - can already be found at Mouser Electronics new integrated circuit from Texas...