Re: [Repeater-Builder] Fan controller

[Virden Clark Beckman]

Search ARRL technical articles - N8AKS recently wrote up a great circuit
- be sure to use aluminum window screen as it is for a 12 VDC fan.

drwoolweaver wrote:
> 
> I need a simple circuit for a repeater PA fan controller with delay
> time out.  I did a search, but found nothing.  Thanks de David
> 

-- 
73...Clark Beckman N8PZD

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RE: [Repeater-Builder] Fan controller

[Steve S. Bosshard \(NU5D\)]

Master Pro Stations had a thermal switch on the PS PCB that when it got to
140 deg F would cause the fan to stay on.  Else the fan operated during PTT
only.

Merry Christmas,

Steve


Who knows himself a braggart, 
Let him fear this; for it will come to pass 
That every braggart shall be found an ass. 
~ Shakespeare







 

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Re: [Repeater-Builder] Fan controller

[Mike Morris WA6ILQ]

At 05:04 AM 12/25/03 +, you wrote:

>I need a simple circuit for a repeater PA fan controller with delay
>time out.

See below

>  I did a search, but found nothing.

That's funny.  I put the three words
"repeater" "fan" "control" into Google
and got over 16,000 hits.  The first 30 or
so were interesting.

>  Thanks de David

The simplest way involves no delay.
Just run the fans continuous until you build a fan control
board.

I took advantage of the fact that at the surplus electronics
stores the 220v muffin fans are priced way cheaper than the
identical 120v ones.  The 220v ones run just fine at 120v just
a lot quieter and a lot slower (which means they last longer).
Even at half voltage they blow enough air on a heat sink to
keep it cool.  The ones with brass sleeve bearings will last a
couple of years continuous, the ones with ball or roller bearings
will last 5 years or so.

If all you can find is 120v ones just put two of them in series.

I bought six of the 220v ones (at $2 each) and have one on each
Mitrek link radio heat sink, two on the Micor repeater
heat sink and two spares.

I have a Klixon thermal switch on each heat sink wired
to turn on a extra fan and to provide an alert of the
overheating condition.  See the last schematic on the
web page at 

There was also a fan control project in the July 2003 QST
by N8AKS. If you aren't a subscriber then somebody in
your ham club probably is.  Borrow the issue and xerox the
article.

Another controller is at
http://www.seits.org/repeater/rptfan.htm
The link to the schematic is broken in the article, use
this one:  http://www.seits.org/repeater/rptfan.gif

Another article is at
http://sound.westhost.com/project42.htm

Now that I've done the homework for you I'd like you to
let us know what you decide.

Or write an article on fan control for www.repeater-builder.com

Mike WA6ILQ




 

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Re: [Repeater-Builder] Fan controller

[mch]

Also, don't forget simply using a controller that directly supports
fans:  . Simple doesn't
necessarily mean cheap. To some people, plug-n-play is the most simple
form. Not that these controllers are plug-n-play, but a relay circuit is
easy enough for most people. The timing is in the controller.

Joe M.

Mike Morris WA6ILQ wrote:
> 
> At 05:04 AM 12/25/03 +, you wrote:
> 
> >I need a simple circuit for a repeater PA fan controller with delay
> >time out.
> 
> See below
> 
> >  I did a search, but found nothing.
> 
> That's funny.  I put the three words
> "repeater" "fan" "control" into Google
> and got over 16,000 hits.  The first 30 or
> so were interesting.
> 
> >  Thanks de David
> 
> The simplest way involves no delay.
> Just run the fans continuous until you build a fan control
> board.
> 
> I took advantage of the fact that at the surplus electronics
> stores the 220v muffin fans are priced way cheaper than the
> identical 120v ones.  The 220v ones run just fine at 120v just
> a lot quieter and a lot slower (which means they last longer).
> Even at half voltage they blow enough air on a heat sink to
> keep it cool.  The ones with brass sleeve bearings will last a
> couple of years continuous, the ones with ball or roller bearings
> will last 5 years or so.
> 
> If all you can find is 120v ones just put two of them in series.
> 
> I bought six of the 220v ones (at $2 each) and have one on each
> Mitrek link radio heat sink, two on the Micor repeater
> heat sink and two spares.
> 
> I have a Klixon thermal switch on each heat sink wired
> to turn on a extra fan and to provide an alert of the
> overheating condition.  See the last schematic on the
> web page at 
> 
> There was also a fan control project in the July 2003 QST
> by N8AKS. If you aren't a subscriber then somebody in
> your ham club probably is.  Borrow the issue and xerox the
> article.
> 
> Another controller is at
> http://www.seits.org/repeater/rptfan.htm
> The link to the schematic is broken in the article, use
> this one:  http://www.seits.org/repeater/rptfan.gif
> 
> Another article is at
> http://sound.westhost.com/project42.htm
> 
> Now that I've done the homework for you I'd like you to
> let us know what you decide.
> 
> Or write an article on fan control for www.repeater-builder.com
> 
> Mike WA6ILQ
> 
> 
> 
> Yahoo! Groups Links
> 
> To visit your group on the web, go to:
>  http://groups.yahoo.com/group/Repeater-Builder/
> 
> To unsubscribe from this group, send an email to:
>  [EMAIL PROTECTED]
> 
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Re: [Repeater-Builder] Fan controller

[Eric Lemmon]

David,

Nothing is simpler than a thermal switch.  I bought a #317-1094-ND
thermoswitch from Digi-Key that closes at 50 degrees C (122 degrees F)
that fills the bill perfectly, for just $9.  I drilled and tapped two
holes on one of the radio's heat sink fins, and mounted the switch with
a dab of heat-sink compound under it to ensure good heat flow.  During
heavy usage of the repeater, the muffin fan runs for a few minutes- but
only when needed.

73, Eric Lemmon WB6FLY

drwoolweaver wrote:
> 
> I need a simple circuit for a repeater PA fan controller with delay time 
> out...




 

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Re: [Repeater-Builder] Fan controller

[Gene Colson]

At 04:04 AM 12/25/03, you wrote:

>Also, don't forget simply using a controller that directly supports
>fans:  . Simple doesn't
>necessarily mean cheap. To some people, plug-n-play is the most simple
>form. Not that these controllers are plug-n-play, but a relay circuit is
>easy enough for most people. The timing is in the controller.
If you purchase a controller, make sue you get one that has been 
tried,tested and reliable.
Gene W7UVH





 

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Re: [Repeater-Builder] Fan controller

[albemarle7]

Aiprax (http:www.airpaxtsp.com/tspsite/6700.html) is a very nice thermo 
switch. Web site explains all about it. Been using them for years.  The size of 
a 
T0-220 case, handles  1 amp although I prefer driving a fan relay then I can 
switch anything.  Operating temps start out at 40 deg C and work up to 130 deg 
C 
in 5 deg steps. Purchase the temp you want. I use P/N 67F040 (40 deg C). The 
"F" stands for fan or normally open and the "L" is normally closed. Stocked at 
Sager Electronics 508 947-. Sager #AIT67F040. Cost $6.85.  I ordered mine 
thru Inagitron Sales, Langhorn, Pa 215 250-7778. Drill one 4/40 hole in 
heatsink and install with some temp grease. Airpax makes a lot of different 
temp 
control devices.
73, Gary  K2UQ   [EMAIL PROTECTED]



 

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Re: [Repeater-Builder] Fan controller

[Bryon Jeffers K0BSJ]

If you are in the mood to spice it up a bit, Maxim has some really neat fan 
controller IC's. Here is a link to one of many, this one is a stand-alone 
and easy to interface.

http://pdfserv.maxim-ic.com/en/ad/MAX6665-AD.pdf

Bryon K0BSJ

At 08:03 AM 12/25/2003 -0800, you wrote:
>At 04:04 AM 12/25/03, you wrote:
>
> >Also, don't forget simply using a controller that directly supports
> >fans:  . Simple doesn't
> >necessarily mean cheap. To some people, plug-n-play is the most simple
> >form. Not that these controllers are plug-n-play, but a relay circuit is
> >easy enough for most people. The timing is in the controller.
>If you purchase a controller, make sue you get one that has been
>tried,tested and reliable.
>Gene W7UVH
>
>
>
>
>
>
>
>Yahoo! Groups Links
>
>To visit your group on the web, go to:
>  http://groups.yahoo.com/group/Repeater-Builder/
>
>To unsubscribe from this group, send an email to:
>  [EMAIL PROTECTED]
>
>Your use of Yahoo! Groups is subject to:
>  http://docs.yahoo.com/info/terms/





 

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Re: [Repeater-Builder] Fan controller

[Tony King - W4ZT]

I use this one: http://repeater.w4zt.com/circuits/fanptt.html
Modify it as you see fit.

I also put a White-Rodgers fixed setting temperature switch (3F01-111 which 
closes at 110F and opens at 90F), available from Grainger 
http://grainger.com, in parallel with the relay and in contact with the 
heat sink slab to keep the fan(s) running if the heat sink is still hot 
after the time-out period.

Merry Christmas,
Tony W4ZT

At 12:04 AM 12/25/2003, you wrote:
>I need a simple circuit for a repeater PA fan controller with delay
>time out.  I did a search, but found nothing.  Thanks de David
>
>
>
>
>
>
>Yahoo! Groups Links
>
>To visit your group on the web, go to:
>  http://groups.yahoo.com/group/Repeater-Builder/
>
>To unsubscribe from this group, send an email to:
>  [EMAIL PROTECTED]
>
>Your use of Yahoo! Groups is subject to:
>  http://docs.yahoo.com/info/terms/





 

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RE: [Repeater-Builder] Fan controller

[Robin McCoy]

I also have used Airpax devices with great results.

Robin
N7XGG
rmccoy01 at earthlink dot net

-Original Message-
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]
Sent: Thursday, December 25, 2003 1:21 PM
To: Repeater-Builder@yahoogroups.com; [EMAIL PROTECTED]
Subject: Re: [Repeater-Builder] Fan controller


Aiprax (http:www.airpaxtsp.com/tspsite/6700.html) is a very nice thermo
switch. Web site explains all about it. Been using them for years.  The size
of a
T0-220 case, handles  1 amp although I prefer driving a fan relay then I can
switch anything.  Operating temps start out at 40 deg C and work up to 130
deg C
in 5 deg steps. Purchase the temp you want. I use P/N 67F040 (40 deg C). The
"F" stands for fan or normally open and the "L" is normally closed. Stocked
at
Sager Electronics 508 947-. Sager #AIT67F040. Cost $6.85.  I ordered
mine
thru Inagitron Sales, Langhorn, Pa 215 250-7778. Drill one 4/40 hole in
heatsink and install with some temp grease. Airpax makes a lot of different
temp
control devices.
73, Gary  K2UQ   [EMAIL PROTECTED]





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