Convert audio signal to light bulb source

[rsapan]

Hi Guys,

Anybody can give me an idea about the mono audio output signal from my fixed termnal can use a low power light bulb instead of a speaker. I have a project instead of hearing a beep sound coming from the speaker as a result of the bar code scanned process, I want to see a status light. What should I use a relay or switch device to have stable light? I have no idea.

I appreciate your help. Thanks.

 

[IanP]

Take a look at the attached picture ..
You can feed the audio signal directly to 10µF capacitor and remove two opamps which drive LEDs .. The bottom opamp will give you light signal (driving a bulb through a transistor) when an audio signal of certain level appears on the input ..

Regards,
IanP

 

[manojshukla]

Simply Amplify the signal.
Rectify it with diode rectifier circuit.
Feed it to bulb.