[time-nuts] newbie question Thunderbolt supply

EWKehren at aol.com EWKehren at aol.com
Mon Aug 27 09:38:16 EDT 2012


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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