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NNTP-Posting-Date: Tue, 17 Dec 2002 09:49:42 -0600
From: "Robert L. Bass"
Subject: Re: Audio controlled decoration
Date: Tue, 17 Dec 2002 10:49:13 -0500
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Go to Sam Ash Music. They've got (or at least they used to have) disco
light controllers that have an audio input. The light flashes to the beat
of the music. ISTR they were most sensitive to bass frequencies. These
things are cheap and easy.
Note: If the only ones available have a built-in PAR lamp, just unscrew the
lamp, insert one of those lampholders with a pair of outlets and plug your
Christmas (there's that word again) lights into the outlets.
Try looking under American DJ or MBT (both at Sam Ash).
Robert L Bass
Bass Home Electronics
ASA Approved Vendor
2291 Pine View Cir
Sarasota, FL 34231
877-722-8900 Sales & Support
"Steve W.EE" wrote in message
> I would like some ideas on how to build a circuit
> to make Christmas tree lights flash to music. I
> want each of 3 or 4 colors to respond to certain
> sound frequencies. For example the white lights
> respond to over 3000Hz and would flash when cymbals
> or similar instruments are played. I tried building
> one of those Ramsey kits but the filters were
> horribly non-selective you could not really tell
> which lights were responding to which frequencies.
> There is more stuff about the Ramsey kit I don't
> like. It has a small 8:500 ohm stepup transformer
> 3 pots, 3 real crude RC filters and 3 SCR's.
> The SCR's of course will only light the bulbs to
> 50 percent brightness. I guess what happens is
> when the filtered audio gets above 0.7 volts the
> SCR triggers. The lights flash rather nervously
> and the effect is not pleasing at all.
> I'm not sure whether I need an AGC because the music
> source I'm using is quite compressed. I do want
> something which flashes the lights in a pleasing
> Can anyone point me to some circuits which I could
> build in a couple days with common parts. I've got
> a half dozen optos and triacs left over I'd like
> to use them to feed the bulbs with full-wave AC.
> Steve W. stevew-ee.nym@alias@net ( interchange . and @ )
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