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Old 4th October 2012, 04:57 PM   #261
ashok is offline ashok
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Burning Amplifier BA-1
I want to make it there in 2013 ! If things coast along like now, it should be possible. If I come next time, I'll bring along some gadgets !
As usual I have to start planing much ahead of time so that a lot of things can be done on that trip. Maybe stay longer this time in Arizona and see some bright orbs in the sky !

I'm working on some ideas which might be interesting. Better to try it here first just in case they aren't worth it.

Are you guys comfortable for funds for the BAF this time ?
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Old 9th October 2012, 03:18 PM   #262
Alettagla is offline Alettagla  Netherlands
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Default hardwire lay out for ba 1

Originally Posted by tinitus View Post
hey, that is thanks Nelson
me like to hardwire that one

man you are fast
Here are two draft drawings for a hard wired BA 1

The upper and lower mosfets banks are on separated boards

It's a first draft and it is not doubble checked for errors or possible improvements in the lay-out

Comments or notification of errors are most welcom

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File Type: jpg ba-1 hardwired concept.jpg (339.2 KB, 449 views)
File Type: jpg ba-1 hardwire ccs side Cconcept).jpg (340.5 KB, 426 views)
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Old 29th October 2012, 02:30 AM   #263
The Space Egg Corp is offline The Space Egg Corp  England
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Looks good dude !
Nice 12" strip of 'Turret Board' eh?
Good stuff...
...Old Schooool !
Bo...Yah !

Jeez...One day I'll make one of these suckers !
Just caught up on the thread...
...can't quite believe this thread is ONLY 27 pages long...
...I swear the BA-1 and SOZ are the coolest ( NOT ! ) of Nels's 'hot circuits'.

I bet if Nelson got ship-wrecked on a desert island ( that had AC sockets ! ) he'd wish it was with a BA-1 or SOZ...
...I bet he's not letting on about that though...
...which is 'the best'...who knows.


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Old 6th November 2012, 07:56 PM   #264
Alettagla is offline Alettagla  Netherlands
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Default function of zenerdiodes in powerstage

Could someone explain the working or functioning of the zeners in the powerstage. (I see the same 9.1 v. zener doing 9.1V and 5v)

addititional just to check which wattage would be sufficient.

your assistance is most welcom
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Old 7th November 2012, 11:48 AM   #265
lbaggio is offline lbaggio  Brazil
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Zeners keep a specified voltage across them by transforming more or less energy in heat by varying their internal resistance.
Are used to regulate a voltage and protect some parts of the cisrcuit.
Of course their regulating ability depends on how much energy they can dissipate.

Please see in the Wikipedia a very good article on the matter.

Zener diode - Wikipedia, the free encyclopedia
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Old 10th November 2012, 01:00 AM   #266
Alettagla is offline Alettagla  Netherlands
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Thanks for your response. I know the working of a zener. But What I would want to understand is their function in the powerstage of ba1. I would be very pleased if you or someone could explain this to me.

Regards René
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Old 10th November 2012, 02:08 AM   #267
flg is offline flg  United States
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Do you mean D101 and D102? They limit the max G-S Voltage. Most of these parts have an oxide layer thick enough to withstand 20V before rupture (sounded good?) If this is a follower, the G-S voltage difference should be very small, certanley less thatn 9.1V? Actually, the FET would be turned on so hard if the G-S Voltage was 9.1V, you would be blowing a fuse if it was more than several miliseconds. I'll bet they also play a roll in softer clipping, than a cicuit without them?
"It was the perfect high end audio product: Exotic, inefficient, expensive, unavailable, and toxic." N.P.
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Old 21st November 2012, 12:57 PM   #268
Alettagla is offline Alettagla  Netherlands
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Thanks FLG for your explanation,

Regards René
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Old 21st November 2012, 01:01 PM   #269
Alettagla is offline Alettagla  Netherlands
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Does anyone know where I can get mica insulators for the IRFP240 in to-247 packages.
Or something else from mica that fits.

Preferably a distributor in the Netherlands.

Your help is appreciated

Regards René
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Old 21st November 2012, 07:55 PM   #270
Andersonix is offline Andersonix  Sweden
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Here's a datasheet from Keystone. But one can also fashion a TO-247 mica insulator from a TO-3 insulator...
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File Type: jpg Keystone mica p91.jpg (312.3 KB, 209 views)
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