Electronic Candle Blow Out

Posted on Oct 2, 2012

This design was developed by request of a correspondent having made a sort of LED candle and needing to switch off the LED with a puff. This simple, easy to build gadget can be useful as a prop for Halloween and Christmas season, shows and the like.

Electronic Candle Blow Out
Click here to download the full size of the above Circuit.

Q2 & Q3 form a self-latching pair that start operating when P1 is pushed: in this way the LED (or bulb) will illuminate steadily. When someone emits a strong puff in the vicinity of the small electret microphone, the resulting signal will be greatly a

Leave Comment

characters left:

New Circuits



Popular Circuits

Wireless doorbell 300MHz
Audio-controlled lamp
800 To 1000Mhz Scanner Converter Circuit
Inductorless Switching Regulator Circuit
sound source locator uses
150mW Crystal AM Transmitter PCB
Voltmeter with LED for car battery PCB
40 MHz Wideband RF Amplifier
Small TV Transmitter Circuit