Delayed Alarm (CB6418E)

This alarm circuit has a trigger delay system. The circuit was found in a Popular Electronics of the 90s. The components are common.

| Clique na imagem para ampliar |

TTL Schmitt Trigger 7400 (CB13777E)
In the figure we have the way to implement a TTL Schmitt trigger for 60 Hz signals, obtaining...
Active Bass and Treble Filter (CB10381E)
This circuit was found in an English magazine from 1977. Signal inputs and outputs must be...
Rumble Filter (CB13879E)
This filter eliminates the rumble of the motor of a record player when recovering this type of...