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Dennis Feucht

An Illustrated Guide to Transistor Amplifiers

Dennis Feucht
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D Feucht
D Feucht
8/27/2016 1:07:52 PM
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Blogger
Re: Love the picture!
Jim,

That was my primary workbench when I last lived in the USA. Most of the instruments are typical of electronics benches, but on the right side is one that is not: a dynamometer. This is the "oscilloscope" of motor testing in that it allows the torque-speed functions of motors to be acquired, by holding either torque or speed constant and varying the other. This instrument, a Model DSP6000 from Magtrol, had cost about $10,000 US new circa 1998, though something of comparable function can be devised using a brush motor instead of a hysteresis brake for less than $1000. It has been an ongoing decades-long project of mine (and others) and would fill a hole in the market - if only someone would get to it!

If you or anyone else would be interested in building on what has been done thus far (and the project is far along) by participating in such a project on an open-source basis, contact me at the email address pointed to by my previous posts for this article.

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jimfordbroadcom
jimfordbroadcom
8/26/2016 12:03:08 PM
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Artist
Love the picture!
Yes, Dennis, I love the picture of the workbench!  I had to do a double-take because it resembles my garage lab so much!  As I have time, I will read the blog and comments.  No doubt it will be worth my time, and unless my guess is way off, your book will be well worth my $$, too.  Thanks.

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D Feucht
D Feucht
8/24/2016 11:55:30 PM
User Rank
Blogger
Re: Extremely interesting stuff !!
I have already recommended to the printer (I am the publisher) that they increase their shipment options to reduce price.

For Europeans and others, there is somewhat of a different solution. Contact me at my email address at innovatia dot com slash Inquiry for a PDF option at a price that you will find is necessarily reasonable. I am trying to encourage open-source access to the book while still receiving some benefit for having written it, and am offering the PDF version on a pay-as-you-will honor system. (If you find the book worthless, don't send me anything; if it is invaluable, clean out your savings account! - well, not really - decide for yourself how much the book is worth to you.)

PDF is better than nothing, but if you are like me, a bound printed version is better to work with. Unhappily, DHL shipments no longer can originate in the USA. However, the cheapest option - ordinary airmail - could possibly be set up from here (Belize) if enough of you really want a paper copy with a reduced shipping cost.

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D Feucht
D Feucht
8/24/2016 10:29:24 PM
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Blogger
Re: epub options?
catch220,

Write to me at the email address given at

http://www.innovatia.com/Inquiry.htm

and I'll describe how you can get a PDF copy.

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ejw0
ejw0
8/24/2016 6:32:55 PM
User Rank
Newbie
Power Supply Rejection (& others)
FWIW. This is probablysomething you all do, but when I've finished doing the basic design I usually resimulate with various "uwanted" signals injected to clarify their effect.

For example adding a few (m)volts ripple to the power supply to see the effect on the output signal.

I guess the habit comes from (too) many years using a singal injector and a 'scope, but I find it useful.

If your simulator allows it, or you have the patience to do it manually, you can also try parameter variations for things like current gain, transconductance, etc.

Again, sometimes the results are enlightening!

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ejw0
ejw0
8/24/2016 6:19:54 PM
User Rank
Newbie
Re: epub options?
+1 @catch220

I agree, this looks like an interesting book.

I know printing costs have risen a lot over recent years, but I can't justify $60 + shipping on something that may only be of limited use.

A more reasonbly priced "electronic" version would be much more tempting!

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Navelpluis
Navelpluis
8/24/2016 10:59:32 AM
User Rank
Newbie
Extremely interesting stuff !!
Hi Dennis,

First of all, thanks for posting these circuits. Together with the explanatory info they are a joy to 'discover'. I simply love these kind of circuits, and use analog stuff a lot, even in our new circuits !! The ones saying that all gets digital, hey, forget about it. In our sensor world, pre-conditioning and power circuits the world is very analog and always will be. But now I am ranting on a blog with people finding this too trivial. Sorry about this ;-) 

I ordered your 2 books, and I am certain this will contain good practical reading.

One remark: Advice your publisher not to hate Europeans too much: The shipment costs with USPS to mainland Western Europe is $ 59,12 that I rather would have spend on you.

 

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catch220
catch220
8/24/2016 9:50:26 AM
User Rank
Newbie
epub options?
Looks like a useful book, unfortunately shipping for me costs the same amount as the book! Are there any epub or other electronic copy purchase options?

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