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Old 4th December 2009, 10:51 PM   #121
AR2 is offline AR2  United States
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Quote:
Originally Posted by cviller View Post
It's not really on my table right now.
I know, I know, it is a diner time, but after you finish diner and clean up dishes, than you could put boards on the table...
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Old 4th December 2009, 10:56 PM   #122
cviller is offline cviller  Denmark
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This is me right now (the guy with the guitar), but the wires are tangled...
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Old 5th December 2009, 08:41 AM   #123
joho is offline joho  Netherlands
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Thanx, I really enjoy doing it and playing with various circuits. Canno't wait for Cviler to finish BA boards. I have a feeling that BA 1 and 2 are going to be really great amps.
I wish I had so much time to play with all the variations.
A wishfull thinking!

Life is to short

Succes,
Johan
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Old 10th December 2009, 08:43 PM   #124
Botte is offline Botte  United States
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Default Cascode Option for BA boards

Hi Cviller,

Here is a request for the Cascode option for the BA board.

Thanks,

Botte
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Old 10th December 2009, 11:18 PM   #125
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cascode would be a good tweak.
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Old 10th December 2009, 11:26 PM   #126
cviller is offline cviller  Denmark
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Sounds like a cascode is popular... I wouldn't mind adding it. Anyone against?
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Old 10th December 2009, 11:30 PM   #127
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if PSU voltage is reason ..... when voltage goes up , R205 also need to goes up
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Old 11th December 2009, 04:46 AM   #128
cviller is offline cviller  Denmark
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It has been a while since last I looked at the schematics, but after refreshing my memory it kinda makes less sense to spend too much effort on doing a cascoded version. Having previously played around with the diff pair on the aleph j, I would say that we would probably not hit the sweet spot or even the DC stable spot in our first attempt, if we decide to cascode the input, and it is not as simple as with the F5 - it can be done, but the design will be approaching an opamp.

Furthermore, the whole idea behind the Burning Amps is that we get some really nice general purpose output stages to play around with, and this frontend is just the beginning - but what a beginning!
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Old 11th December 2009, 07:41 AM   #129
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Ok no worries

For those that would like to try a higher powered version (eg +/- 40V rails) of the BA2, would we be best off using irf9610 (like on Aleph 30) or would we be best served by using bipolars like 2sa970 at the input?

Last edited by Melon Head; 11th December 2009 at 07:47 AM.
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Old 11th December 2009, 01:12 PM   #130
Botte is offline Botte  United States
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Nelson said to Cascode the differential pair, so I’m staying with the 2sj109 and will fix the voltage on the cascode devise at ~15V for 40v rails, I guess we can cut traces on the board to make it fit. This is a hobby
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