Alarm Buzzer (CB24392E)

This circuit was found in July 1975 Radio Electronics magazine. Power depends on the trigger transistor and the effects of capacitors C1 and C2.

| Clique na imagem para ampliar |

Dual Limit Comparator (CB5087E)
This circuit was obtained in a documentation of the 80s, using operational of the time. The...
Fast adder 3 (CB7057E)
In the figure we have a third fast adder that we found in an 80's Electronic Engineering. The circuit can...
Music Box or Musical Bell (CB18703E)
We found this simple music box circuit that can also be used in a musical bell in a 1991...