Found in a 1964 Electrronic Design, this circuit is intended to control analog video signals. The circuit has an attenuation of 45 dB at 20 kHz.
This setting appears multiple times on the site from different sources. This is from a 2000 manual...
September 2016 - Mouser Electronics is making available the new TVS of Littelfuse TP1.5KE to...
Found in an American 80's documentation, this circuit can use common FETs like the BF245 and cover...