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Old 5th June 2009, 12:37 PM   #61
Tea-Bag is offline Tea-Bag  United States
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Quote:
Originally posted by cviller



Regarding the board layout, the question whether to include bias circuit or not has kinda postponed the updates. If the BA2 is essentially the same, but with a different bias arrangement it would be possible to make a "board sandwich" where the bias circuitry is a daughter-board on the general BA board.

Wouldn't it make more sense to put it on the output? Maybe an output board would be in order to make things tidy, then again, we probably need to space FETS out real good..
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Old 5th June 2009, 12:41 PM   #62
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Quote:
Originally posted by Tea-Bag



Wouldn't it make more sense to put it on the output? Maybe an output board would be in order to make things tidy, then again, we probably need to space FETS out real good..

You're right, but here's where we need to figure out what to sacrifice - the Burning Amps chassises come with the fets and output boards already mounted, and the whole point of this amp is to fit into those chassises....

Who should we make an easy build for - the people with or without a nice burning amp chassis?
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Old 5th June 2009, 12:43 PM   #63
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Quote:
Originally posted by cviller


Who should we make an easy build for - the people with or without a nice burning amp chassis?

The people with, it's really for them.
The rest who venture here can make do with daughter boards.
Next winter would be a good time for me to work on something like this!
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Old 5th June 2009, 08:26 PM   #64
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Quote:
Originally posted by cviller
Who should we make an easy build for - the people with or without a nice burning amp chassis?
In the end, we will want to attract those without chassis. The chassis were
simply an excuse to do a project.

It looks like most of the BA designs will use the output stages as followers,
so it's practical to think of an outboard front end design. This modularity
will allow for easy swapping and upgrading of front ends.



BTW, trying to finish the text on BA2 this weekend
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Old 5th June 2009, 09:05 PM   #65
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If I could be accommodated, it would be good to fit three driver boards into each of the two large BA amps I have. Three pairs of four mosfets instead of two pairs of six. That is, three channels per amp.

- Eric
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Old 5th June 2009, 09:51 PM   #66
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Putting the front end boards on the outside would be a simple solution
to your problem, Eric. You would need to put the bias circuits on the
inside on the output stage, and of course you would need the additional
connectors.

I don't recall, did you get the N and P channel or all N channel outputs?

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Old 6th June 2009, 05:45 AM   #67
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Geez, the foreshadowing is thick around here!
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Old 6th June 2009, 08:53 PM   #68
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Quote:
Originally posted by Nelson Pass
I don't recall, did you get the N and P channel or all N channel outputs?
Hi, Nelson.

I have two amps with twelve pairs per amp. One amp has all N-channel IRF240, the other has N and P channel IRF244/9240.

This is enough to make six amp channels with 3 N-channel pairs in each chassis. In other words, I could make six A5 amps, three per chassis. Four amps would be all IRF240, the other two IRF244. I'd have to move around the transistors in the N and P chassis and not use the P channel devices.

- Eric
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Old 7th June 2009, 01:12 AM   #69
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The draft of BA-2 is in Variac's mailbox.

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Old 7th June 2009, 01:40 AM   #70
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