Audio Memo Alert Circuit


Posted on May 31, 2012

This device prevents paper notes and memos from being overlooked. A paper note placed between two fingers made of a conducting material (metal or conductive plastic) breaks the circuit, allowing pair 1 of Ul-a to go high.


Audio Memo Alert Circuit
Click here to download the full size of the above Circuit.

This causes Ul-c Ul-d to act as an oscillator, pulsing piezo buzzer BZ1.




Leave Comment

characters left:

New Circuits

.

 


Popular Circuits

Safe-opamp-circuit
Tremolo
Duty-Cycle Measurer
Geiger Counter I Circuit
Many simple door buzzer sound circuits
12V Regulated Inverter Supply
Job Analysis push-pull output
RC relaxation type tone control circuit
SH-841 ASIC holiday lights



Top