Burning Amplifier BA-2 - Page 13

AR2 · 4th December 2009, 11:51 PM

Quote:

Originally Posted by cviller

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...

cviller · 4th December 2009, 11:56 PM

This is me right now (the guy with the guitar), but the wires are tangled...

joho · 5th December 2009, 09:41 AM

Quote:

Originally Posted by AR2

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

Botte · 10th December 2009, 09:43 PM

Hi Cviller,

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

Thanks,

Botte

Tea-Bag · 11th December 2009, 12:18 AM

cascode would be a good tweak.

cviller · 11th December 2009, 12:26 AM

Sounds like a cascode is popular... I wouldn't mind adding it. Anyone against?

Zen Mod · 11th December 2009, 12:30 AM

if PSU voltage is reason ..... when voltage goes up , R205 also need to goes up

cviller · 11th December 2009, 05:46 AM

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!

Melon Head · 08:47 AM

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?

Botte · 11th December 2009, 02:12 PM

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

10th December 2009, 09:43 PM	#124
Botte diyAudio Member Join Date: Mar 2004 Location: MN	Cascode Option for BA boards Hi Cviller, Here is a request for the Cascode option for the BA board. Thanks, Botte

11th December 2009, 12:18 AM	#125
Tea-Bag not politcally affiliated diyAudio Member Join Date: Feb 2006 Location: Kennebunk Blog Entries: 11	cascode would be a good tweak. __________________ SemiSouth R085/R100A JFET available now DCB1/BiB #3 on order : SSHV2 Sign up Sheet/Payup Sheet Ends 2-26-2012 CLICK HERE

11th December 2009, 12:26 AM	#126
cviller diyAudio Member Join Date: Dec 2005 Location: Copenhagen Blog Entries: 2	Sounds like a cascode is popular... I wouldn't mind adding it. Anyone against? __________________ I have started a blogged guide to my F5 boards read it here: F5 pcb v2 blog

11th December 2009, 12:30 AM	#127
Zen Mod Official Court Jester diyAudio Member Join Date: Jan 2003 Location: ancient Batsch , behind Iron Curtain	if PSU voltage is reason ..... when voltage goes up , R205 also need to goes up __________________ my Papa is smarter than your Nelson ! tnx to clean thread ; Cook Book ; PSM LS Cook Book ; Baby Diyaudio FORUM ; BAF Forum & Gallery

11th December 2009, 05:46 AM	#128
cviller diyAudio Member Join Date: Dec 2005 Location: Copenhagen Blog Entries: 2	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! __________________ I have started a blogged guide to my F5 boards read it here: F5 pcb v2 blog


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11th December 2009, 08:41 AM	#129
Melon Head Formerly Thanh1973 Join Date: Nov 2006	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 08:47 AM.

11th December 2009, 02:12 PM	#130
Botte diyAudio Member Join Date: Mar 2004 Location: MN	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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