[time-nuts] newbie question Thunderbolt supply

Jerry jsternmd at att.net
Mon Aug 27 10:09:21 EDT 2012


Are these thermal pads temp conductive or insulative?  If you want heat
dissipation why not use the readily available thermal grease used for
semiconductor mounting? Cheap and not really messy if applied correctly

jerry

-----Original Message-----
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
Behalf Of EWKehren at aol.com
Sent: Monday, August 27, 2012 9:38 AM
To: time-nuts at febo.com
Subject: Re: [time-nuts] newbie question Thunderbolt supply

Thank you. Will look for it here under thermal pad.
Bert
 
 
In a message dated 8/27/2012 8:08:30 A.M. Eastern Daylight Time,
azelio.boriani at screen.it writes:

Here in  Europe Farnell has the 3M thermal pad in sheets (105x150mm)...

On Mon,  Aug 27, 2012 at 12:48 PM, ew <ewkehren at aol.com>  wrote:

>
> Chris
> Starting with 3.4 W used by the Tbolt  my battery version burns 4.4 W.
>  Using a switcher do generate 7  V   4.8 W and running the 7805 directly
> from 14.5 V 6.2.W. I  use like you an IC temp sensor, two stage op amp 
> driving a fan holding  the backplate temp constant and total power 
> goes up to 7.6 W since the  oven has to work harder. T bolt, switchers 
> and all regulators are on  the other side of the 3/32" Alu plate. The 
> AC switcher
is
> not included  in the power numbers. but is also on the plate. Plate is
held
> at 40  C.
> I am looking for a way to more closely couple the Tbolt circuit  board 
> to the back plate and am looking for the material switchers use  
> between semiconductor and cooling plate Any one know where I can buy  
> it in sheet form?
> Bert  Kehren
>
>
>
>
> -----Original  Message-----
> From: Chris Albertson  <albertson.chris at gmail.com>
> To: Discussion of precise time and  frequency measurement < 
> time-nuts at febo.com>
> Sent: Sun,  Aug 26, 2012 12:31 pm
> Subject: Re: [time-nuts] newbie question  Thunderbolt supply
>
>
> On Sun, Aug 26, 2012 at 3:46 AM,  <EWKehren at aol.com> wrote:
> > Having played with several  solutions I found the best is a 12 V 1 A
>  switcher with the  output voltage increased to 15 V, check the 
> capacitors  and  if  necessary replace with 25 V. I laid out a PC 
> board that has a  TC7662A  inverter  followed by a 79L12.  Also on the  
> board is a 7812 followed by
a
>  7805.
>  Putting them  in series gives me good thermal distribution. ....
>
> ne of the  advantages of generating waste heat like that is that you 
> can ut the  heat to good use.  I build a temperature controlled fan.  
> It  is ery simple a temperature sensor IC connects to an opamp that 
> drives  a ower transistor that drives a 12V fan.
> As for the power  supply.  I used a filter that does not drop any 
> volts
and
>   can't see any RF on the DC using my old 365 Tek scope or by using a
more
> ensitive RF power meter.
>
> hris Albertson
>  edondo Beach, California
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