[time-nuts] newbie question Thunderbolt supply

Azelio Boriani azelio.boriani at screen.it
Mon Aug 27 12:07:41 UTC 2012

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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