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I've been trying to make one of those sound to light kits that flash lights in time to music. I've tried three different kits, followed the instructions, and can't get them to work. I realize I'm kind of a moron, but I'm wondering if anyone knows any specific things that can go wrong. I've checked over the schematics, and everything looks like it's in the right place. Could I be damaging some of the components with static electricity?

Hi ,

I am new to group.. but one suggestion i have to
make is why not we share what we know rather than
asking the questions.....:-)

Hope that all of us have something to share...

For your question what you can do is.. when-ever
there is a sound an electrical signal is
generated and now depending on the amplitude you
can light various LEDs display...

This was general.. lets be specific for each
frequency or say freq-range we have a particular
voltage assosiated so if you can make simple
transistor ckts that can trap up to a critical
voltage then you are through... With this i mean
that try to make simple transitor ckts that work
at a particular voltage say .1volt , .2volt and
so on as per the input range......this won't be
difficult and then you can attach the LEDs to
them to get the display....
Try and learn the basics rather than the Kits..

It helps more...

Regards

Himanshu sharma

I've been trying to make one of those sound to
light kits that flash
lights in time to music. I've tried three
different kits, followed
the instructions, and can't get them to work. I
realize I'm kind of a
moron, but I'm wondering if anyone knows any
specific things that can

=====
Himanshu Sharma Ramdev

URL:

__________________________________________________
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This was general.. lets be specific for each
frequency or say freq-range we have a particular
voltage assosiated so if you can make simple
transistor ckts that can trap up to a critical
voltage then you are through... With this i mean
that try to make simple transitor ckts that work
at a particular voltage say .1volt , .2volt and
so on as per the input range......this won't be
difficult and then you can attach the LEDs to
them to get the display....
Try and learn the basics rather than the Kits..

Actually, what you describe sounds like an LED bargraph circuit. The LM3914 and LM3915 (national semiconductor) chips are great for this. They will light up an LED for each step increase in voltage. Just like you describe. These are the chips that are always used for level indicators, or LED type VU meters in audio applications. It's certainly possible to make one from scratch out of transistors, but when you can do it with an off the shelf part, why not?

-Tavys

hi

audio applications. It's
certainly possible to make one from scratch out
of transistors, but
when you can do it with an off the shelf part,
why not?

No offence...

I always thought that many people enjoyed
elecronics...

I am trying to make a 2 bit processor outof
transistors just for the sake to learn as this
has more fun than assembling kits...
I could have used the 128bit RISC processors...

Actually, what you describe sounds like an LED
bargraph circuit. The
LM3914 and LM3915 (national semiconductor)
chips are great for this.
They will light up an LED for each step
increase in voltage. Just
like you describe. These are the chips that
are always used for
level indicators, or LED type VU meters in

You are right.. what it does is to compare the
voltage internally and then when the difference
is a particular voltage or a step of 3dB then it
flips another pin for an array of 10 pins in case
of 3914...that is whenever the voltage doubles...


Please read its data-sheet to gain more about the
proper working of it.... and just see that what
kind of refrence voltage you choose...

if you want go for the 3916 as this has better
precision for the levels to change at 0.2bB...

Regards


=====
Himanshu Sharma Ramdev

URL:

__________________________________________________
Do You Yahoo!?
Make international calls for as low as $.04/minute with Yahoo! Messenger

It sounds to me like you are trying to build a color organ. This is a
device that divides a signal into frequency bands, say three, high,
medium and low frequencies. This is done by filtering. The output of
the filters are used to drive SCRs, the SCRs drive 110v lamps. Do you
have an oscope? If not you should get one. Hand held ones can go for
as little as $199. Or you can use a meter. The pin outs on the SCRs
are probably the problem. Are you using a fabricated PC board?

If you don't have an oscope and can't afford one, then you might want to
build one by either using a TV or LEDs. I have done both when I first
started out and found the projects to be both fun and educational.
Electronics is easier to understand if you can see what's happening.

Phil




*Message: 1
* Date: Sun, 19 Aug 2001 10:53:58 -0700
* From: markallen <markallen@...>
*Subject: light to sound kits

*I've been trying to make one of those sound to light kits that flash
*lights in time to music. I've tried three different kits, followed
*the instructions, and can't get them to work. I realize I'm kind of a
*moron, but I'm wondering if anyone knows any specific things that can
*go wrong. I've checked over the schematics, and everything looks like
*it's in the right place. Could I be damaging some of the components
*with static electricity?