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Old 10th January 2013, 10:29 PM   #1
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Default AB100 Class AB Power Amplifier

AB100 Amplifier - Micro Article by Nelson Pass

Since villagers armed with pitchforks and torches have begun camping
out my front door demanding a Class AB power amplifier, and

Whereas, I am inclined to demonstrate my goodwill in this manner and
do in fact have a 13 year old piece laying around unpublished,

I Hereby Present the AB100 Class AB Bipolar power amplifier.

Salient Specifications:

Rails: +/-50V or so

Gain: 36 dB (this was the request of the people who commissioned
this but did not want to pay for it)

Bandwidth: 5 Hz to 100 KHz (-3 dB)

Damping Factor: about 500

Maximum power: 100 Watts 8 ohms, 200 Watts 4 ohms

Slew Rate: 30 V/uS

Bias Current: about 0.08 A per channel

Following are several graphics. (Unfortunately I scanned them in the
distant past, so the quality is not up to my usual standards)

Let It Not Be Said: That I never did anything for you....

Attached Images
File Type: gif AB100 001.gif (101.0 KB, 2302 views)
File Type: gif AB100 THD 8.gif (58.7 KB, 1974 views)
File Type: gif AB100 THD 4.gif (59.0 KB, 1847 views)
File Type: gif AB100 THD FREQ.gif (58.5 KB, 1780 views)

Last edited by Nelson Pass; 10th January 2013 at 10:34 PM.
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Old 10th January 2013, 10:37 PM   #2
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wow. it's a hard acupation:P
do i see a little aleph with a extra stage, inspiration in the front end there?
the TIP 142/147 are To220 right?
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Old 10th January 2013, 10:42 PM   #3
6L6 is offline 6L6  United States
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Very cool.

Or at least less rejected heat than 100WPC class-A.

EDIT -

Ok, which of the smaller transistors need to be mounted on the main heatsinks for thermal tracking?

TIP-142 and -147 are available in TO-247 -- hooray!

What can be substituted for the 2SA1110 and 2SC2590? (If anything...)

Last edited by 6L6; 10th January 2013 at 10:47 PM.
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Old 10th January 2013, 10:43 PM   #4
Zen Mod is offline Zen Mod  Serbia
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after enough staring , everything is Aleph lookalike

I know .......

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Old 10th January 2013, 10:43 PM   #5
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6L6. heat is a GOOD thing atleast up here close to the north pole (santa is freezing)
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Old 10th January 2013, 10:44 PM   #6
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Quote:
Originally Posted by Zen Mod View Post
after enough staring , everything is Aleph lookalike

I know .......

yes i know wee agree agein
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Old 10th January 2013, 11:06 PM   #7
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Old 10th January 2013, 11:20 PM   #8
6L6 is offline 6L6  United States
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Looking at it a bit more...

Is 100uf necessary on the input? Or is that just insurance against the rest of the world?

Does the pot adjust bias or output DC offset?

Are the neg gate diodes 4004's and the positive rail 4001's, or is that a typo? Should they all be 4004's?

Is everything, as currently drawn in the schematic, an electrical junction? Specifically, look to the right of R4.

Approx. how many VA, per channel, is required of the power transformer?

Last edited by 6L6; 10th January 2013 at 11:30 PM.
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Old 10th January 2013, 11:24 PM   #9
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i bet they all should be 4004. 4001 will burn very fast
the pot seams to be for bias.
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Old 10th January 2013, 11:36 PM   #10
eyoung is offline eyoung  United States
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Oh my...


E
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