adding fan to audio system

Printed From: the12volt.com
Forum Name: Car Audio
Forum Discription: Car Stereos, Amplifiers, Crossovers, Processors, Speakers, Subwoofers, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=123601
Printed Date: May 03, 2024 at 9:55 AM

Topic: adding fan to audio system

Posted By: radarcontact
Subject: adding fan to audio system
Date Posted: September 20, 2010 at 8:49 PM

I want to add a fan to my system. I have some questions (below the following description). Here's the one I'm looking at:

Manufacturer:

SANYO DENKI - SANACE FANS

Newark Part Number:

33R0999

Manufacturer Part No:

9S0912F4011

RoHS Compliance : posted_image Yes

Description

FAN, SILENT, 92MM, 12V, FAST SPEED
External Height:92mm
External Width:92mm
Depth:25mm
Current Type:DC
Supply Voltage:12V dc
Current Rating:140mA
Flow Rate:44.5cu.ft/min
Noise:27dBA
Connection Type:Wire Leads
Series:San Ace
RoHS Compliant: Yes

I figured I would use a relay off the system's remote turn-on to activate the fan.

I have two questions:

- 140mA is relatively nothing as far as power draw, correct? (That's my really dumb question)

- Will the fan, CAN the fan, introduce noise into the audio system? (Not-so-dumb question, I hope)

Thank you in advance.

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RadarContact

Replies:

Posted By: 66sportfury
Date Posted: September 21, 2010 at 1:24 AM

Q1 yeah its not much, good move using a relay,

Q2 theres no reason it should introduce noise into the system as long as the connections are GOOD pwr and ground

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ac delco am radio and sparkomatic 40 watt sound exploder

Posted By: oldspark
Date Posted: September 21, 2010 at 5:05 AM

Why a relay? They draw as much as the fan!

Posted By: i am an idiot
Date Posted: September 21, 2010 at 7:36 AM

Fans can introduce noise into your system. If it does give you problems, parallelng a 1000 microfarad capacitor across the fan will eliminate the noise. As a general practice from the days of remote circuits of radios not having protection from overcurrent, I always use a relay. Remote wire of radio to the coil of the relay and to that connection only. Have the relay power every remote wire and fan in the system. This way if yoiu have to add the capacitor to combat the noise, you will not have to stress the remote circuit of your radio to charge the cap everytime you power the radio on. Install a diode across 85 and 86 of the relay.

Posted By: 66sportfury
Date Posted: September 22, 2010 at 5:38 AM

they can introduce noise, i never came across that problem,

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ac delco am radio and sparkomatic 40 watt sound exploder

Posted By: oldspark
Date Posted: September 22, 2010 at 5:59 AM

That's the problem with a "can".

But I'd suck it & see.

If the fan introduces noise, then add a relay and capacitor.
If the amp doesn't handle the fan (and hence a relay), then a separately powered fan.
(And if the amp handles the fan but not the relay and cap....)