Battery Status Indicator (CB6064E)

This bargraph circuit is from an ancient American documentation. It indicates the charge state of a set of 4 batteries from 9.6 to 5.2 V.

| Clique na imagem para ampliar |

Automatic Control System (CB18693E)
This circuit was found in a 1998 documentation and its purpose is to automate controls by timing its...
Intermittent Sound (CB1436E)
This circuit is from a 1977 Radio Shack documentation. It produces a modulated sound of good...
Unit gain low pass filter (CB7574E)
This second-order filter was found in old American documentation and can be applied to other...