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False floors and fans


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#1 Markb

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Posted 05 Aug 2002 - 00:26

Ok I am going to make a false floor for my amps to go in.

How do I go on with Ventilation?

Do I need some fans or something?
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#2 JPS

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Posted 05 Aug 2002 - 01:50

yes, pc fans are the way to go.
one either end, one to blow one to suck air back out.
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#3 Amit

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Posted 05 Aug 2002 - 13:42

Have a scout round in your boot behind carpets etc..

You should find some vents (one either side) that let the air in the car escape when you slam the door.

Put fans in the rack, and use plastic tubing to duct the air in/out of these.

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#4 Markb

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Posted 05 Aug 2002 - 17:18

What voltage do these computer fans run at?

How do I wire them so they only come on with my stereo?
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#5 Madmax

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Posted 05 Aug 2002 - 17:57

You need a relay, which uses the remote turn on to switch a higher ampage supply, which can run fans & neons etc.

There was a v good site about relays etc. but it has disapeared. you will need 1 relay, 1 switching diode (to protect head unit) 2 fuses holders, 1 for signal from head unit and 1 for signal in.

I put all mine in a lovely little tweed box my gran nitted me (honest...or it might have been a black pastic box from Maplins)

All the parts are available from Maplins.

This is how my false floor was done...

<a href="http://www.sounddomain.com/id/dalepickles" target="_blank">http://www.sounddoma...dalepickles</a>

I hope this helps.

Computer fans run at 12V but if you go down maplins, they have fans from 40mm up to 120mm.
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#6 Alistair

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Posted 05 Aug 2002 - 17:57

PC fans are 12V (handy that).

Wire in a relay which is operated by the remote out from your head unit. This relay can also feed the amp(s). Maplins sell a suitable relay for about 50p

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#7 Markb

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Posted 05 Aug 2002 - 18:04

Can I wire something so I can use the power from my boot light, and make it turn on with the remote turn on?

What parts would I need?
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#8 Madmax

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Posted 05 Aug 2002 - 18:08

you need 1 relay from maplins (40amp one will easily do and costs £1.50) 2 fuses holders (lil white ones which need soldering to wire) with a 1 amp fuse on head unit remote turn on and 5 or 10 amp fuse on power input. You can take the power input from the main power feed to the boot.

All you need is then a diode which stops negative voltage going back up to the head unit if you blow a fuse on the amp. The negative voltage can kill the remote turn on output.

When i get home i'll give you all the part numbers and take some pics of how i done it.
Dale

#9 Markb

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Posted 05 Aug 2002 - 18:14

Cheers mate.
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#10 Markb

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Posted 06 Aug 2002 - 05:06

Did you get chance to look for me?
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#11 Madmax

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Posted 06 Aug 2002 - 05:10

I'm doing it right now....5 min :)
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#12 Madmax

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Posted 06 Aug 2002 - 05:19

Relay.... page 189 part# LJ68Y
Rectifier Diode... part# QL73Q
Fuse holders... part# RC70M x 2
fuses... 1 amp part# GL74R 5 amp part# GL81C

There are 4 terminals on the bottom of the relay, labelled 85, 86, 87 and 30.

The remote turn on from head unit goes to terminal 85.

terminal 86 goes to ground

terminal 30 is power in, so from your distribution block

terminal 87 is the remote turn on output that can power all your fans etc.

The diode needs to be soldered to terminal 85 and 86, there is a little line on the diode, this should be towards terminal 85.

Remember to fuse the inputs into terminals 85 and 30, 1 amp on the 85 and the 5 amp on the 30.

It is easy to do, sounds complicated, but easy. This was the first bit of soldering i did :)

I then put mine in one of Maplins small black plastic boxes and use speaker terminals to connect the wires outside, i'll get a pic of it 2morrow for you. :)

I hope this helps
Dale

#13 Markb

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Posted 06 Aug 2002 - 05:26

Cheers mate.

I think I still need the pic to guide me :)
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#14 Madmax

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Posted 06 Aug 2002 - 05:31

the site is back up, i just accessed it.

the relay section is..

<a href="http://www.eatel.net/~amptech/elecdisc/relays.htm" target="_blank">http://www.eatel.net.../relays.htm</a>

The site has some v useful stuff and the main site is...

<a href="http://www.eatel.net/~amptech/elecdisc/caraudio.htm" target="_blank">http://www.eatel.net...araudio.htm</a>
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#15 Naresh

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Posted 07 Aug 2002 - 17:12

Hi just been reading this post with interest. I've built a false floor and just need some MDF now to create the cover. I have a small perspex panel which I frosted over but kept the logo clear, and want to light it up using a neon strip. Can I take a feed from the boot light to make it work only when the boot is opened? I assume this is ok and requires no relays? Can a fan be made to work in exactly the same way?

Cheers, Naresh