similar to SKA

djk · 7th June 2007, 05:13 AM

I thought this use of a bootstrap cap around the Vas to the diff inputs looked a lot like the SKA (from SAE, 1974).

http://tinyurl.com/3a72hb

http://f1.grp.yahoofs.com/v1/0JBnRvp...D/SAEIVDM1.jpg

lineup · 7th June 2007, 06:06 AM

It is a bit many components
Which caps do you refer to, djk?

I take a guess it is C13, 100uF.
They are bootstrapping.
Is that right?

If you mean C9, C10, they are local compensation caps.
22pF and 47pF.
There was a Topic about this, some month ago.
This is a good alternative to use such comp caps.
Alternative to global compensation cap, in feedback line.

Are you up to try some new design of a power amplifier?
What was your latest build?

Regards, lineup

lumanauw · 7th June 2007, 07:42 AM

What's the schematic looks like? I cannot connect to the URL.

djk · 7th June 2007, 10:38 AM

image

djk · 7th June 2007, 11:00 AM

"It is a bit many components
Which caps do you refer to, djk?

I take a guess it is C13, 100uF.
They are bootstrapping.
Is that right?"

Yes, C13 and C14 were the ones I was thinking of. The cascode front-end of the SAE is probably more like Greg's 300 watt model.

destroyer X · 7th June 2007, 02:36 PM

Also i will have the interest to know the model number and the factory name...yeah..already informed into the transistors.

If you prefer.... and will be better to me because bigger resolution, upload ot my mail box please.

panzertoo@yahoo.com

I want to simulate and to construct this one...i have some plans to compare simple and complex designs with the same supply.

this one is complex enougth.

There are informs missing into the rigth side of your schematic published

regards,

Carlos

lumanauw · 7th June 2007, 03:28 PM

Strange. Now I cannot see what DJK attached in post #4.

7th June 2007, 05:13 AM	#1
djk diyAudio Member Join Date: Feb 2001 Location: USA	similar to SKA I thought this use of a bootstrap cap around the Vas to the diff inputs looked a lot like the SKA (from SAE, 1974). http://tinyurl.com/3a72hb http://f1.grp.yahoofs.com/v1/0JBnRvp...D/SAEIVDM1.jpg __________________ Candidates for the Darwin Award should not read this author.

7th June 2007, 06:06 AM	#2
lineup diyAudio Member Join Date: Dec 2005 Location: the north	It is a bit many components Which caps do you refer to, djk? I take a guess it is C13, 100uF. They are bootstrapping. Is that right? If you mean C9, C10, they are local compensation caps. 22pF and 47pF. There was a Topic about this, some month ago. This is a good alternative to use such comp caps. Alternative to global compensation cap, in feedback line. Are you up to try some new design of a power amplifier? What was your latest build? Regards, lineup __________________ lineup

7th June 2007, 11:00 AM	#5
djk diyAudio Member Join Date: Feb 2001 Location: USA	"It is a bit many components Which caps do you refer to, djk? I take a guess it is C13, 100uF. They are bootstrapping. Is that right?" Yes, C13 and C14 were the ones I was thinking of. The cascode front-end of the SAE is probably more like Greg's 300 watt model. __________________ Candidates for the Darwin Award should not read this author.

7th June 2007, 02:36 PM	#6
destroyer X diyAudio Member Join Date: Feb 2004 Location: Recife - Brasil Northeast	DJK, can you please upload to me the entire schematic you have published. Also i will have the interest to know the model number and the factory name...yeah..already informed into the transistors. If you prefer.... and will be better to me because bigger resolution, upload ot my mail box please. panzertoo@yahoo.com I want to simulate and to construct this one...i have some plans to compare simple and complex designs with the same supply. this one is complex enougth. There are informs missing into the rigth side of your schematic published regards, Carlos __________________ Try to build an amplifier folks ... it is pure adrenaline!

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7th June 2007, 07:42 AM	#3
lumanauw diyAudio Moderator Emeritus Join Date: Oct 2002 Location: Bandung	What's the schematic looks like? I cannot connect to the URL.

7th June 2007, 10:38 AM	#4
djk diyAudio Member Join Date: Feb 2001 Location: USA	image __________________ Candidates for the Darwin Award should not read this author.

7th June 2007, 03:28 PM	#7
lumanauw diyAudio Moderator Emeritus Join Date: Oct 2002 Location: Bandung	Strange. Now I cannot see what DJK attached in post #4.

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