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From: jbh@mibte.UUCP (James Harvey)
Newsgroups: comp.sys.amiga
Subject: Re: Quieter fan for the 2000?
Summary: Fan Fix
Message-ID: <2758@mibte.UUCP>
Date: 30 Jan 89 17:56:48 GMT
References: <2414@eos.UUCP> <1208@esunix.UUCP>
Organization: Michigan Bell Telephone Company
Lines: 40

In article <1208@esunix.UUCP>, lhoward@esunix.UUCP (Larry Howard) writes:
> From article <2414@eos.UUCP>, by phil@eos.UUCP (Phil Stone):
>> I'm pretty happy with the move so far, except that since I use the Amiga
>> almost exclusively for music, the stock fan has got to go - I think the
>> "music" that it makes is very boring and much too loud.  I have heard
>> mention here of somebody swapping in a much quieter (Radio Shack??) fan
>> that actually moves more air.  Three questions:
>> 
>> 	1) What fan(s) fit(s) this description?
> 
>   The one I replaced it with I found in a Digi-Key catalog.
> It's a Panasonic model FBH-08A, Digi-Key #P9962-ND.  Cost is $24 for
> quantity one.
> 
>> 		Phil Stone	 (phil@eos.arc.nasa.gov  OR  phil@eos.UUCP)
> Larry Howard

Another trick you can do that is easier and cheaper than
replacing the entire fan is to put a Two Microfarad non-polar,
200 volt at least capacitor in series with the existing fan.
This will drop just enough voltage to quiet a muffin fan down to
reasonable levels.  I ran a fan modified like this for years with
my 1541 disk drives.  If the fan runs too slow, try 3
microfarads, if it is still too fast, 1 microfarad.  Most muffin
fans won't start with one microfarad though.

The advantage of the capacitor as a voltage dropping device is
that it dissipates no heat.  If you do this with a resistor it
will get VERY hot.  Don't try to use one of those light dimmer
SCR type fan speed controls as they radiate so much RFI it will
screw up your computer.  
-- 

Jim Harvey                        |      "Ask not for whom the bell
Michigan Bell Telephone           |      tolls and you will only pay
29777 Telegraph                   |      Station-to-Station rates."
Southfield, Mich. 48034           | 

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