[sdiy] Re: Vactrols and contact mics

[aghostAGHOSTaghost]

I was searching for another way to do this and it looks like it would
be easier to construct a simple color organ.
here is a schematic I found but I'm still curious if I would need to
amplify the signal from the contact mic for this circuit.
http://www.aaroncake.net/circuits/corgan.asp
walter


On Fri, Oct 16, 2009 at 4:30 AM, cheater cheater <cheater00 at gmail.com> wrote:
> One way you might control a led's brightness from an analogue source
> is if you copied the general idea of how DSD sampling works - just get
> a very fast triangle oscillator, and compare it to the (normalized)
> signal from the piezo. The piezo signal must have the same p-p
> voltage. Then output a 1 if it's above the triangle wave, and 0 if
> it's below. Pretty much done.
>
> D.
>
> On Fri, Oct 16, 2009 at 3:25 AM, bill bigrig <billbigrig at yahoo.com> wrote:
>> Howdy,
>>  Once again, "Handmade Electronic Music" second edition, by Nicolas Collins enters the picture. There is a large section on combining LEDs and photo resistors, and using them to control all sorts of stuff. Sort of a "roll your own" vactrol. He also goes into triggering the led with a peizo driver. Electret mic elements are covered, along with pseudo analog to digital conversion for processing, then back to analog. I am hard pressed to tell you all the ideas this book opened me up to. Most of you probably already know most of this info. I knew some, but the way the book is laid out covers so many ideas it"s hard to describe.
>> Rig
>>
>>
>>
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