[time-nuts] Thunderbolt Supply - Final word

[shalimr9 at gmail.com]

Precisely because most of us do not have access to much fancy test equipment (I am one of the lucky ones), there is no excuse for not using freely available, quality tools (assuming that you have a computer) like LT Spice.

Of course, you have to be careful as the quality of the output from any simulation software will only be as good as the inputs you feed into it. However, used appropriately, it will save you hours on the bench, and avoid the pain and embarrassment of building something that may have a major flaw.

Also, it allows you to verify that your circuit will work under conditions that may be difficult to experimentally create (such as aging, component tolerances and temperature).

So when Bruce offers his advice based on Spice simulations, I pay attention.

Didier KO4BB

Sent from my Verizon Wireless BlackBerry

-----Original Message-----
From: "Paramithiotti, Luciano Paolo S" <luciano.paramithiotti at hp.com>
Sender: time-nuts-bounces at febo.com
Date: Thu, 17 Feb 2011 08:37:24 
To: Discussion of precise time and frequency measurement<time-nuts at febo.com>
Reply-To: Discussion of precise time and frequency measurement
	<time-nuts at febo.com>
Subject: Re: [time-nuts] Thunderbolt Supply - Final word

 
Fleming was perfectly located, in spite of himself, the problem of all groups and clubs in the world. There is always an imbalance between theory, practical experience and implementation. There are always good advice, but hardly any solutions. I invite us all to use most of the iron to finish the process that starts from the theory, design and ending with implementation. Otherwise we run the risk to celebrate itself without producing anything of working.

Luciano

Luciano P. S. Paramithiotti



-----Original Message-----
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On Behalf Of Flemming Larsen
Sent: giovedì 17 febbraio 2011 3.19
To: shalimr9 at gmail.com; Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Thunderbolt Supply - Final word

Didier et al,

I did not ask for, and did not expect rocket science. Just a simple solution or advice from some of the much more experienced people on this list. I am trying to put my equipment together after having had everything in storage for several years. Being retired and on a limited budget, I am trying to make what I have work, rather than trying to reinvent the wheel.

Given enough time and an unlimited budget, I'm sure that I could come up with a better solution.

For the time being, I was hoping that someone on the list could point me to a simple solution that would fit my needs and budget, thinking that lots of other people have had to go through similar steps with the number of Chinese switching power supplies that were sold with the Thunderbolts, both here on the list and on eBay.

> just care and good engineering.

I totally agree. I did that professionally for many years, but now I'm retired and no longer have access to the resources and test equipment I used to have access to at work. Other people on the list have access to better resources than I do and many people have more experience than I do, especially when it comes to switching power supplies.

I appreciate all the advice I was given, although nobody pointed me to a circuit with component values that I could simply duplicate, instead of having to go the whole process of getting my books off the shelf and do what others have already done.

No matter now. UPS just brought me a nice linear power supply today.
5 volts @ 28 amps and +/-12 volts @ 3 amps. Although probably many times overkill for the application and as big as breadbox, this should probably work, and without the unnecessary need to add complex (or not) filters.

Thanks again,

-- Flemming Larsen    OZ6OI/KB6ADS    Berkeley, CA, USA


Sent from my computer




> Sent from my Verizon Wireless BlackBerry







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