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Old 20th May 2013, 01:55 AM   #131
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Default AB100 PCB

Trying make layout, Vas using BD139/140 and 3 pair output, for DiyAudio UMS .

Schematic
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PCB
Click the image to open in full size.

Didiet

NB: for some unknown reason, my pcb link to imageshack got error
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Last edited by didiet78; 20th May 2013 at 02:01 AM.
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Old 20th May 2013, 02:35 AM   #132
6L6 is offline 6L6  United States
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Wow!!! That is a fantastic first layout!! Thank you Didiet!

What are the current PCB dimensions?

And a question for the community -- Does anybody know if Q3, Q5 Q6 need to be individually heatsinked and/or need to be on the main heatsink to track the output's temperature?
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Old 20th May 2013, 02:57 AM   #133
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Quote:
Originally Posted by Nelson Pass View Post
A few quick answers.

(deleted)

The 1n4004 (or any diode) is for current limiting - they will not get burned
out with the little current available from the front end.

The bias transistor for the output stage is best mounted where the heat is.

(deleted)
Dimension 74.14 x 251.44 mm (Like Honey Badger, more or less)

Didiet
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Old 24th November 2013, 05:26 PM   #134
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Has anyone built Mr Pass' AB100 and, if so, how does it sound?
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Old 8th April 2014, 08:42 AM   #135
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In my repair bench stands A stasis Nakamichi PA 7 first series

Since i am an sziklai lover and very familiar with the principal of operation of the circuit i will have to say that i simply admire the circuit and i find it innovative for the time designed and farther more use of technology that was unknown at the time and excellent choice and use of semis ...

When i first looked at this thread i was expecting a stasis probably with no more power than 60 or 100 W but an advanced circuit may be 10 times better than the stasis ...

Even though Papa has given so many things to the community in the Class A it looks that his brain is absorbed by the heat and class AB lovers will have to wait for a feature spark ...

One way or another every member of the forum including me will have to pay his respects to Papa since just a couple of words from Papa equals to 10 theory books available in the market .

Thanks Papa !!
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Old 8th April 2014, 06:41 PM   #136
tinitus is offline tinitus  Europe
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Quote:
Originally Posted by charly666 View Post
... how does it sound?
I guess we will never know
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Old 9th April 2014, 08:51 PM   #137
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Quote:
Originally Posted by east electronics View Post
One way or another every member of the
forum including me will have to pay his respects to Papa since just a couple of
words from Papa equals to 10 theory books available in the market .
Thanks Papa !!
Thank you.
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Old 9th April 2014, 09:33 PM   #138
tinitus is offline tinitus  Europe
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Nelson, now I'm curious

are you really thinking like Sakis, that this amp should never be built
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Old 7th July 2014, 05:27 PM   #139
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Default High Quality Home Theater Amp

Can this circuit be run a few watts into class A and then into AB?

I would like to make a home theater amp with 5 channels or more.

I was thinking of a Class A/AB, 75 to 100w, 2-stage, Mosfet output, 4 ohm capable circuit, but why reinvent the wheel, if this circuit can be at least be biased for Class A to a few watts.

Anyone still working on boards?

Thanks,

Vince
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Last edited by vdi_nenna; 7th July 2014 at 05:30 PM.
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Old 7th July 2014, 06:24 PM   #140
Bigun is offline Bigun  Canada
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This amplifier is interesting also because it uses power Darlingtons - they are not very popular and I never heard anybody say they can be used to achieve good sound.

Can power Darlingtons be used to achieve good sound ?

I have a bunch of Sanken power Darlington devices in To3p packages (1560 & 2390) from a disassembled HT receiver, so they are not matched. But with higher source resistors that may not be an issue.

What about a BA3 style output stage, can be used with BA1/2/3/ input stage. Instead of MOSFETs we use Darlingtons and bias them at optimal AB, maybe add a pre-driver and we have a triple that's easy to driver.

One could decide that the first Watt should be all Class A, so we want at least 500mA idle current (8R load). Say we can get away with 0R47 source resistors then we need 'only' 9 or 10 output pairs. With +/- 50V rails, imagine what it could do

Hmmm, I have the HT heatsink with holes ready for the 7 output pairs already....

Just thinkin'....
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Last edited by Bigun; 7th July 2014 at 06:53 PM.
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