transistors audio controlled relay circuit


Posted on Feb 5, 2014

A circuit that fires a relay when it detects audio pulses from one channel of an mp3 player. I`m going to record audio pulses in sync with the music to control a motor for mouth movement. So for your stereo player, you`ll just mix music/whatever onto (arbitrarily) the left channel and have the right just be a series of loud sine pulses Nick T Oct 2 `10 at 4:14 Hey Pete - could you give us an idea about the kind and


transistors audio controlled relay circuit
Click here to download the full size of the above Circuit.

size of motor or actuator you intend to use also could you comment a little on the mechanics - maybe just mention how you`d like the resulting thing to move - I just thought it might help people answer your question fully. Jim Oct 2 `10 at 15:14 You probably have to find the value of C1 experimentally. It probably depends on the output impedance of your MP3 player. Look at that point on a scope if you can. endolith Oct 2 `10 at 15:38 The problem you will run into is that there will be input signal levels that will put the 3904 into linear operation. To control a relay you want the transistor to drop either all the supply voltage or (very nearly) none of it. Intermediate states will just waste power cooking your transistor and won`t necessarily pull the relay in. JustJeff Oct 5 `10 at 1:43




Leave Comment

characters left:

New Circuits

.

 


Popular Circuits

Electronic-photoflash
Doorbell Memory
contruction of personal Radar System using PIC MIcrocontroller PIC18f452
Light sensor using Op Amp
Crystal Sine Wave Oscillators
7400 SIREN
Crystal oscillator DTL integrated circuit
30W Hybrid amplifier 01
Blood pressure sensing circuit diagram BP01-type pressure sensor
Press light switch double circuit 3



Top