sound dampening mats: how to compare ?

[VJ]

I'm looking at those noiseblocker fans... They have different models (different speeds, hence different noise levels, ranging from 22 dB up to 30 dB).The interesting part is that the startup voltage of the noiseblocker-fans is specified at 6V (I intend to build a system using digital pots to regulate the speed of the fans automatically (still in design phase, waiting for some components to become available) ; having a guaranteed startup at 6V is very interesting in this aspect ).

Also interesesting might be the rubber mount-pins that seperate the fan from the case and eliminate vibrations (at least, that is what they claim )

Perhaps I should just order and see how it turns out... (it is not that this equipment is very expensive or so)


Jörg

[az]

Also, you can return the stuff within 14 days - I think this also applies when ordering from any EU country, but I am not sure.

For electronic components, have a look at www.reichelt.de

AZ

[DukeP]

Hey VJ.

If your work on that digital (frequency?) based pots goes well, I might have an order for you!

Then standard "Lets just dump the heat through a resistor" approach really doesnt sit well with me.

Ive used the old "Just grap the +12v-5v=7v hack - but Im afraid if something shorts, the entire machine goes kaboom.
(So far no problems tho.).

~~DukeP~~

[Wombat]

Originally posted by DukeP
Hey VJ.

If your work on that digital (frequency?) based pots goes well, I might have an order for you!

Then standard "Lets just dump the heat through a resistor" approach really doesnt sit well with me.

Ive used the old "Just grap the +12v-5v=7v hack - but Im afraid if something shorts, the entire machine goes kaboom.
(So far no problems tho.).

~~DukeP~~

It's not hard at all to use a couple diodes to drop the voltage down, and none of that shorting danger.

[DukeP]

Well, no. But if Your using diodes, you are just dumping the heat inside the case (might be several watts of heat).

The only "Proper" way to do it, is by using a frequency based limitter...

~~DukeP~~

[VJ]

Originally posted by DukeP
If your work on that digital (frequency?) based pots goes well, I might have an order for you!

The idea is to use a MatrixOrbital LCD display. These have an integrated Dallas 1-wire controller, which allows you to configure/command 1-wire devices. Maxim-IC has potentiometers and temperaturesensors that are controlled through the 1-wire interface. The circuit should be ready (on paper), I'm now waiting for the new MatrixOrbital display to become available (planning is March 1st), after which I'll start putting the circuit together...
(I will make a tutorial of it, as I go along)

As for the software-portion, LCDC can be used to send commands to the Matrix Orbital, including 1-wire commands to connected devices. Nevertheless, as I can't seem to find the plugin I'd need, I'm working on my own...


Jörg