Baxandall tone control (CB20804E)

In the figure we have the typical circuit of a Baxandall tone control applied to an operational amplifier. The operational can be of any type.

| Clique na imagem para ampliar |

Lie Detector (CB24608E)
We found this circuit in the October 1979 issue of Radio Electronics magazine. It uses a 7016...
Self-biased amplifier (CB22507E)
This circuit is from a Radio Electronics from 1950. The transistor was still new and called a...
Simple continuity tester (CB7955E)
This very simple continuity tester uses a small 1.5 V lamp (type used in flashlights). Can be...