LME49810 using triple CFP output stage - Page 2

panson_hk · 8th September 2011, 03:24 AM

The EF buffer on/off becomes output voltage/current dependent. The output stage gain has additional changes due to this phenomenon as depicted in the figure. An additional nonlinearity is added to the output stage.

EWorkshop1708 · 8th September 2011, 03:27 AM

What about a true CFP triple??? Only one 0.7V B-E drop?

I'm designing one now, it has the CFP, but the emitter of the predriver is tied to the OUTPUT through a resistor. Turned it on, but get some oscillation, but still tweaking it out.

panson_hk · 8th September 2011, 03:54 AM

A true CFP does not have such phenomenon.

Mr Teal · 9th September 2011, 04:45 PM

Quote:

Originally Posted by EWorkshop1708

What about a true CFP triple??? Only one 0.7V B-E drop?

I'm designing one now, it has the CFP, but the emitter of the predriver is tied to the OUTPUT through a resistor. Turned it on, but get some oscillation, but still tweaking it out.

That will be an option I'll look to investigate. I really don't have any experience with amplifier design other than simple LM3886/LM4870 designs, so I imagine the learning curve will be steep. I did get my LM chip in though, so once I get my recession buster speakers built I'll get into this project more seriously.

I do like hearing that the output stage should be reuseable though. Other than ljm_ljm, the general consensus seems to be that if properly implemented this should make a serviceable amp.

AndrewT · 9th September 2011, 04:50 PM

The learning curve can be as steep or as shallow as one wants/needs.
It's one's ambition that puts on the stress.

Dave Zan · 21st January 2012, 04:11 AM

Did you actually try this?
It looks, as you say, very similar to the Self circuit but the low resistance that ties the CFP to the load means it works quite differently, I think. So I am quite curious about your results. What's the latest?
David

sesebe · 18th April 2012, 07:28 PM

Anything new?

9th September 2011, 04:50 PM	#15
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	The learning curve can be as steep or as shallow as one wants/needs. It's one's ambition that puts on the stress. __________________ regards Andrew T.

21st January 2012, 04:11 AM	#16
Dave Zan diyAudio Member Join Date: Nov 2010	Any update? Did you actually try this? It looks, as you say, very similar to the Self circuit but the low resistance that ties the CFP to the load means it works quite differently, I think. So I am quite curious about your results. What's the latest? David

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Bipolar/MOSFET CFP output stage	ashok	Solid State	25	28th November 2010 09:31 AM
LME49810 W/ Thermaltrak CFP Output	BarryJF02	Chip Amps	6	13th September 2009 12:23 AM
LME49810 and Leach output stage.	DigitalJunkie	Chip Amps	15	8th April 2009 10:56 AM
driver stage for CFP output.	RichardJones	Solid State	0	21st April 2003 07:46 PM
CFP output stage - how to choose resistor	yves	Solid State	0	3rd July 2001 01:49 AM

New To Site?	Need Help?
Register to Participate Search Privacy Statement Contact Us	Frequently Asked Questions Did you forget your password? Mark Forums Read


	Please consider donating to help us continue to serve you. Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving

8th September 2011, 03:54 AM	#13
panson_hk :) diyAudio Member Join Date: Aug 2005 Blog Entries: 10	A true CFP does not have such phenomenon.

18th April 2012, 07:28 PM	#17
sesebe diyAudio Member Join Date: Jan 2011 Location: Iasi	Anything new?

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)