Add on fan to Lilliput -- Power ?? where ??

**ddogg_777** · 02-04-2005, 03:03 AM

I was thinking of adding a fan in the same place as Don an then hooking the fan to the speaker output. My fan is a 12V 0.06A fan so it draws less power than the 32ohm, 1W speaker that I took out. I want to do this because I can then use the volume buttons in the front to lower/raise the fan speed. As you technicals might guess, I need to hook up a signal to the audio input. My question is, how high of a signal? 1V, 3V, 5V, 12V?? My theory is to solder up a wire from the audio input to the power input, that way the fan will come on whenever the lcd is powered.

**ddogg_777** · 02-04-2005, 03:28 AM

Here is a link to the IC amplifier on the board: http://www.semiconductors.philips.co...7052AT/N2.html

**ddogg_777** · 02-04-2005, 03:51 AM

DOH! Scrap that idea, the volume buttons only work in video1/2, not vga.

**mox** · 06-01-2005, 05:41 AM

Originally Posted by ddogg_777

DOH! Scrap that idea, the volume buttons only work in video1/2, not vga.

Now that audio can be enabled in VGA-mode through the hidden factory settings menu, I will look into the idea of turning the volume buttons into a fan speed controller. It depends on whether the signal on pin 4 of the TDA7052 ("DC volume control") can deliver enough current to power a 40mm fan directly. I'd suggest adding a darlington as a buffer anyway.

**baggers** · 06-01-2005, 08:25 AM

Originally Posted by mox

Now that audio can be enabled in VGA-mode through the hidden factory settings menu

HOW? please do tell, as I've been wanting to find out for AGES.

Thanks in advance,

Baggers.

**ddogg_777** · 06-01-2005, 11:27 AM

Sweet Mox, let me know what you find, I've pondered this too.

**66miles99** · 06-02-2005, 12:32 AM

Isn't this thread for the sound in VGA mode codes you were speaking of...just my .02

Lilliput Programming Guide, More Reset Codes

**vairu** · 10-10-2005, 01:08 PM

Awesome info! I'll probably do this one day just to make me feel better that the screen will run a little cooler. Where can i get a fan like that? Do regular stores sell ones that small? (Best Buy, Circuit City, etc.) Thanks

**super-fly** · 04-08-2008, 11:52 PM

has anyone tried hooking up the fan to the speaker output with any success

**HiJackZX1** · 04-10-2008, 02:58 AM

I know this thread is super old, but I got 3 Lilliputs also and Im thinking of doing this also. I had 2 fans blowing air in, but the screen still seemed to get hot, so now Im going to go head and remove the speaker and draw air out....

Originally Posted by ddogg_777

No. Fans actually heat up the air as it passes through the blades. You always want the fan to suck so that the hot air from the blades is exhausted. The only reason you would want a fan to blow on something if it was wet. Evaporation comsumes a lot of energy, thus cooling whatever is wet. This is why you sweat and you feel cool when a fan blows on you. However, electrical components don't sweat.
BTW, I was actually gonna do this to my Lilly too. Thanks for the pics Don!

Does this also apply to PC cases? I was thinking of having a large fan blow air in, and other fans blowing air out. Should I reverse it and have the large fan draw the air out and the 2 smaller fans on the sides blow in?