This 1 kHz filter was found in the March 1997 issue of Electronics Now magazine. The circuit is applicable to any operational amplifier with a dual power source.
This is perhaps the first PIC project to appear in a publication. The article is from Radio...
This traditional configuration is from a 1976 publication, showing that nothing has changed since...
This is a field strength meter found in an 80's Hands On. The circuit operates at frequencies up to 500...