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Old 15th August 2001, 10:14 PM   #1
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Has anyone built the A40M class-A amplifier?

It was a Norman Thagard design published in Audio Electronics.


Carlos
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Old 28th September 2002, 12:03 PM   #2
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Default A40M Parts List? Board Pattern

I just reread the A40M articles in Audio Electronics (starting Sept. 1999) and thought it might be fun to build but...there does not appear to be a parts list in the series. Was it ever published? Also..has anyone done a board layout for it? I'm fairly inexperienced at scratchbuilding so I am somewhat intimidated when it comes to designing the layout.

Has anyone, other than the author, built this amp yet?

thanx
rt
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Old 28th September 2002, 12:20 PM   #3
paulb is offline paulb  Canada
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If I remember correctly, some of the parts were difficult to get (discontinued, maybe?) I think Dr. Thagard answered a letter concerning this somewhere in one of the (6?) issues.
I think a PCB would be necessary to build this, and was disappointed that one was not offered.
What a great series of articles, though. His explanations are superb. He obviously has a knack for instruction.
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Old 28th September 2002, 06:52 PM   #4
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has anyone got the schematic?
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Old 28th September 2002, 07:03 PM   #5
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Default A40M

The parts list (I don't know how I missed it!) is on page 11 of Audio Electronics Issue 5 of 1999. The schematic is on page 10 of the same issue. Issue 4 of 2000 has the letter that was referred to in a previous post (by paulb) that contains information on parts. It can be found on page 49.

I am curious if anyone has built it or layed out the artwork for the boards.

rt
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Old 28th September 2002, 07:12 PM   #6
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hi would you care to post the schematic?cheers!
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Old 28th September 2002, 07:19 PM   #7
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Default A40M Schematic

As weird as it sounds I don't have any easy access to a scanner....let me see what I can do...if I can't get it scanned I'll just mail it to you...a photocopy.
rt
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Old 28th September 2002, 09:25 PM   #8
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Default Hold on!

Give me some time and I will provide the scan for circuit, pcb and all.


Carlos
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Old 28th September 2002, 09:38 PM   #9
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Default A40M Schematic + Board pattern

carlmart,
that would be great! looks like we have some interest in building this amp!

rt
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Old 29th September 2002, 03:45 PM   #10
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Thumbs up Main scans (1)

These are the five main scans for the A-40 project, but I had to zip them.

The parts that were missing I did add, as well as correcting a resistor value which was wrong on the list.

Have a look and tell me if something is wrong.


Carlos
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File Type: zip a-40_1.zip (29.9 KB, 260 views)
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