explorerbaba

Hello,
I wish to make a circuit that can be used to control 3-5 lights in accordance with the rythm of some audio signal fed to it.
I have heard of some music ICs but doesnt know their part no. nor their function.
Please help..

nickelflippr

Here's an idea for the lighting side http://www.national.com/pf/LP/LP3943.html
Not a very friendly package to solder.

audioguru

Don't use that impossible to solder IC and drive it with a computer, use an LM3915 instead.
It has ordinary pins that mount through holes on a circuit board or on stripboard.
Its datasheet shows a peak detector circuit that holds the peak level for a moment long enogh to see it. It drives up to 10 LEDs and has built-in current regulation for the LEDs.

__________________
Uncle $crooge

nickelflippr

Agreed, what chip/circuit would you use to seperate bass, mid, and high frequencies to display with the LM3915?

MrDEB

explorerbaba dosn't mention what size of lights.
I recall in the mid-late 60's we built simple color organs using scr's
very simple circuit. I recall powering 150w colored bulbs. One bulb per scr.
am sure if this is what you want then a search engine. As for dividing the frequencies into 3 sections then filters. The color organ had adjustable filters.

explorerbaba

Thanks all for replying.
I plan to light three 100W bulbs.
Please post the circuit using LM3915.

audioguru

An LM3915 is designed to drive low voltage LEDs not high power light bulbs.

You need a high power color organ circuit. Light bulbs are slow to turn off so they might not need peak detector circuits.

__________________
Uncle $crooge

MrDEB

most are really simple BUT you must remember that it is running at a lethal 110v
the last one is using a lm3915 but as Audioguru pointed out it has a slim chance of working.
http://www3.telus.net/chemelec/Proje...olor-Organ.htm
http://home.maine.rr.com/randylinscott/jan99.html
http://www.aaroncake.net/circuits/organ1.gif
http://www.discovercircuits.com/C/color-org.htm
http://www.national.com/mpf/LM/LM3915.html