Anybody have scan of AN-483B (Motorola)? - Page 2 - diyAudio
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Old 26th January 2009, 05:13 AM   #11
lineup is offline lineup  Sweden
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also in this one
we have the Motorola darlington circuit
http://www.ing.unlp.edu.ar/electrote.../practica5.pdf

See this university Amplifier Lab page:
http://www.ing.unlp.edu.ar/electrotecnia/circelec/
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Old 10th November 2009, 03:58 PM   #12
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Quote:
Originally Posted by fotios View Post
This was the old Motolora app note about medium power audio amps using darlington devices. I had it, can't find it anymore, can't locate it on the 'net, and it's driving me crazy! Happy to trade for a scan of some other useful thing- old Dynaco catalog, Onkyo T-15 tuner service manual, SWTP Tiger amp docs, or whatever else might be useful from my library of obsolete technology

Do you mean this? (photo page 1/cover AN-483B)
Please let me know, whether the AN-483B include the
Motorola article from Mr. R. Lender, title:
"Power Amplifier with darlingon output stage"
Motorola Inc., Geneva, Switzerland,
7.9.1974 internal report (July 9. or Sep. 7 - I don't know)
To get this article I started the follow thread:
The most linear stage for large voltage swings - Lender's Circuit

Last edited by tiefbassuebertr; 10th November 2009 at 04:00 PM.
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Old 10th November 2009, 04:48 PM   #13
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Quote:
Originally Posted by Juergen Knoop View Post
tsss, the black devil by Georg Schwarz/Gerhard Haas is still on my wishlist.
It features a single ended input stage, one transistor for voltage gain and a pushpull darlington output stage.
The authors promise "tube sound" with second harmonic distortion only.
And of course it has electrolytics at input and output!
I have still two pairs of BDX64/67 and I will try them in this circuit.
do you mean this German diy project?
Attached Files
File Type: pdf Black Devil-I.pdf (79.2 KB, 410 views)
File Type: pdf Black Devil-II.pdf (125.1 KB, 332 views)
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Old 18th April 2010, 10:31 AM   #14
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Quote:
Originally Posted by fotios View Post
Do you mean this?
I need this paper. Where I can find it online as PDF?
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Old 17th July 2011, 11:19 AM   #15
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Hello Members of The Diyaudio
This is an answer to an old question, about the Motorola Appliction notes AN-483B, AN-484A, and AN-485.
I had photocopies of them, and I have scanned them.
As I am very new to this post I need to know, if I can attatch them to a post, or if I need
to have a homepage to host them.
I also have the little booklet: Audio output designing, with silicon complementary transistors.
Regards to all from Soeren Poulsen Denmark
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Old 17th July 2011, 12:17 PM   #16
lineup is offline lineup  Sweden
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Here is a spanish PDF with Motorola AN-483B
http://www.ing.unlp.edu.ar/catedras/E0215/list.php
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Old 26th July 2011, 03:10 PM   #17
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Quote:
Originally Posted by mikeks View Post
Original app_note available in .pdf. Send me mail.
would you send it to me.fanxu22@126.com,thank you.
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Old 14th August 2011, 07:29 AM   #18
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Quote:
Originally Posted by lineup View Post
Here is a spanish PDF with Motorola AN-483B
http://www.ing.unlp.edu.ar/catedras/E0215/list.php
thank you for this advice.
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Old 11th February 2013, 10:36 PM   #19
JMFahey is offline JMFahey  Argentina
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Small World indeed.
I studied SS amplifier design between 1972/1975 using, among other stuff, that exact same Application Note and doing the same Lab work.
Not surprising, that one you linked to is from UNLP=Universidad Nacional de la Plata (at the Buenos Aires Province Capital), while I studied at UBA (Universidad de Buenos Aires), at Argentina's Capital City.
Anyway there's only 50Km between them, we shared some Professors and anyway it was cutting edge Technology way back then, so I guess many other Universities used that as teaching material.
Our study went way beyond what's shown in that AN, we also learnt to design the PSU, Thermal Stability (an often ignored problem) and short circuit protection.

Thanks for posting, that certainly brings back many warm memories.
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Old 12th February 2013, 08:15 AM   #20
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Default Lender connection?

As far as I can see AN483B does not actually show the famous "Lender" push-pull connection to the VAS.
Have I misread a reference or does anyone know where it was first published?

David
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