> If the FET is not fully on, then its DC resistance will be greater, leading
> to far greater thermal losses, i.e. it'll get hotter... In an SMPS, its vital
> that the switching device is either fully on or fully off, and not ever
> somewhere in its linear region
I was thinking along those lin
On Oct 12, 2014, at 2:53 PM, David Forbes wrote:
> No magnification? You nuts.
>
> I bought a wonderful Bausch & Lomb stereo zoom microscope ten years ago,
I'm with David. I bought a cheap Chinese stereo zoom boom microscope several
years back, and find it indispensable.
As for power and gro
Darin,
Measure what you have for voltage from the power supply unit. If it is a
simple unregulated power supply voltage can be above 12V. Cheap power
supplies are often built of a transformer, four diodes and a capacitor.
Sture
--
You received this message because you are subscribed to the G
Dman clearly has ideas of his own about electronics, misguided as they may
be. He asks plenty of questions here -- usually dominating the topic list
-- that show exactly how little he understands about electronics. If he
wants to butcher up his clocks, let him have at it. If he chooses not to
On 09 Oct 2014, at 02:09, Dman777 wrote:
> And "trace erosion" Really? I've never heard of it, much less of having
> it caused by airflow. Other things can degrade traces, poor processing,
> chemicals, acidity, but airflow? MAYBE compressed air over the course of
> decades... MAYBE.
>
>
My first question is “How hot is it?” If you can keep your finger on it,
it is probably OK, but you should use a thermometer instead of just saying
“hot”.
My prejudice is that the only likely sources of excessive heat are the 7805
and the cpu, but they are both too far away. The only co
Have you measured the power consumption of the clock ? The 6 nixies will
consume about 2 watts, and everything else is dissipated as heat inside the
case. That will give you a rough idea if you have a thermal problem.
If you are around 5 watts, then I'd say you're probably OK. My first nixie
cl
> If you really want to take away some heat, a huge mass
> of metal does the best job, in my humble opinion.
For example, this 51-pound monster:
http://www.ebay.com/itm/201187133796
- John
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You received this message because you are subscribed to the Google Groups
"neonixie-l" group.
To un
away some heat, a huge mass
of metal does the best job, in my humble opinion.
Chuck
>
>
> Original Message
>From: a...@blinkenarea.org
>To: neonixie-l@googlegroups.com
>Subject: Re: [neonixie-l] Nixie Clock Cool Project- a few questions
>Date: Wed, 08 Oct 2014 16:4
Hi,
Dman777 wrote:
> 4) I don't understand why, the heat concentration is in the dead center of
> the clock, but the source of what I think is the source of the heat...the
> 7805 voltage regulator... is of to the side of the source of the heat
> concentration area.
The 7805 only powers the el
Are you aware witch component is due to the heat? I guess its the small SMD
circuit, just behind the spacer or are it the two transistors , just left
from the spacer (seen on photo clock4) ?
In case it is the SMD circuit it might be possible to make a copper heat
sink that is fastened by the spac
"I want to place a fan underneath the clock to draw out this hot air, otherwise
the life of the clock will not be as long as it will without the heat. "
Hot air 'rises' ie is pushed up by denser air. Pulling hot air down is not as
effective as helping it go 'up'.
AND, wherever you are moving ai
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