Flashing light in time to the music?

SkinnyBoy · 7th February 2003, 12:43 PM

Hello, I am looking to make a SIMPLE circuit with adjustable sensitivity that operates a relay in time to the music... I would liek it to accept a line level signal if possible, and operate from 12volts and switch a 12volt relay... I really don't know where to start.. I tried searching the internet, but didn't really know where to begin.. Thanx for all the help. .

Schaef · 7th February 2003, 02:32 PM

Go to your favorite electronics kits site, and do a search for a "color organ" that'll get you what you're looking for. You could also do a google search for color organ circuit, which should return something as well.

Hope this helps you out!

alvaius · 7th February 2003, 02:40 PM

I put something like this together years ago. Going off of memory, it was nothing more than an op-amp in a high pass configuration (to eliminate DC), a second stage that provided a huge amount of gain, a diode at the output of that stage (not a schottky, too high of leakage), a capacitor to ground, a high value resistor parallel to the CAP that would set the turn off delay, and then the positive lead of the cap into the gate of a MOSFET which would turn on the relay.

Now, I just use one of the switched outputs of my AV receiver to control a relay that turns everything else on, but I am guessing you are turning on a sub or something remote.

If the above is too tough to follow, I can put a quick schematic together, but no guarentees it will be right the first time.

Alvaius

SkinnyBoy · 7th February 2003, 02:40 PM

yeah, I found colour organs, but they generally ran from the mains, and used triacs to switch the globes... I will search again however..

SkinnyBoy · 7th February 2003, 02:42 PM

alvaius, I thinl we are talking about different things..

Schaef · 10th February 2003, 04:18 PM

Quote:

Originally posted by SkinnyBoy
yeah, I found colour organs, but they generally ran from the mains, and used triacs to switch the globes... I will search again however..

You are correct in that, that's what most of the do, but there's nothing that says you can't adjust and use 12volts instead of 120volts. (Can't you just feed 12volts through the triac, and get that, its a maximum voltage, isn't it?) If you use the basics presented in those circuits, you should be able to scale them down a little and get what you want.

Why are you hooked on a relay? If what you're looking for is something along the lines of the color organ, the relay won't respond fast enough and will be constantly switching on and off. Or are you looking for some type of threshold device that'll kick on when music is played? (similar to a lot of subwoofer amps)

SkinnyBoy · 10th February 2003, 10:42 PM

Yes, a relay is the wrong idea.... also, triacs only work with AC... I believe I need to use a transistor or mosfet then....

7th February 2003, 12:43 PM	#1
SkinnyBoy Banned Join Date: Nov 2002 Location: Adelaide, Australia	Flashing light in time to the music? Hello, I am looking to make a SIMPLE circuit with adjustable sensitivity that operates a relay in time to the music... I would liek it to accept a line level signal if possible, and operate from 12volts and switch a 12volt relay... I really don't know where to start.. I tried searching the internet, but didn't really know where to begin.. Thanx for all the help. .

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7th February 2003, 02:32 PM	#2
Schaef diyAudio Member Join Date: Jan 2001 Location: Cuyahoga Falls, OH	Go to your favorite electronics kits site, and do a search for a "color organ" that'll get you what you're looking for. You could also do a google search for color organ circuit, which should return something as well. Hope this helps you out!

7th February 2003, 02:40 PM	#3
alvaius diyAudio Member Join Date: Feb 2002 Location: Toronto	I put something like this together years ago. Going off of memory, it was nothing more than an op-amp in a high pass configuration (to eliminate DC), a second stage that provided a huge amount of gain, a diode at the output of that stage (not a schottky, too high of leakage), a capacitor to ground, a high value resistor parallel to the CAP that would set the turn off delay, and then the positive lead of the cap into the gate of a MOSFET which would turn on the relay. Now, I just use one of the switched outputs of my AV receiver to control a relay that turns everything else on, but I am guessing you are turning on a sub or something remote. If the above is too tough to follow, I can put a quick schematic together, but no guarentees it will be right the first time. Alvaius

7th February 2003, 02:42 PM	#5
SkinnyBoy Banned Join Date: Nov 2002 Location: Adelaide, Australia	alvaius, I thinl we are talking about different things..

10th February 2003, 10:42 PM	#7
SkinnyBoy Banned Join Date: Nov 2002 Location: Adelaide, Australia	Yes, a relay is the wrong idea.... also, triacs only work with AC... I believe I need to use a transistor or mosfet then....

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