60 Hz Suppressor (CB6738E)

This filter is intended for 60 Hz noise suppression in amplifiers. We found it in American documentation from the 60s.

Open Fuse Indicator (CB6692E)
Found in old documentation about neon lamps, this circuit shows how to add a simple blown fuse...
Liquid Level Alarm (CB5310E)
This circuit was found in a 1980s documentation. It triggers a relay when liquid from a reservoir...
Cascading the 4520 (CB083E)
For counting to values higher than 16, many 4520 can be cascaded as shown in Figure . The EN...