This simple very low power circuit can be used in a battery powered infrared tone trigger. We found it in an American documentation from the 90s.
The UAA170 integrated circuit is no longer common in our market. With it it is possible to...
This circuit that emits siren sound can be used in a fire alarm. We found it in an old American...
This double time constant circuit for resistive loads was found in documentation from the 1980s. The...