SOA protection - Page 2

mastertech · 21st January 2006, 12:48 AM

ok NP is coming to show you how, my two cents..

CBS240 · 21st January 2006, 02:45 AM

It seems to me that it would be easier and cheaper in the long run to just over design the amp for what you are going to listen too. This would take out the potential of the elaborate protection circuits to affect the quality of the audio signal and keep it back to basics.

If SOA is such a problem for you, and you have no problem with making some sort of complex protection circuit, then maybe you should investigate class G (or maybe H) designs. I like G better because the top rail follows the audio and doesn't introduce HF switching noise. Perhaps Fets for the top rail and BJT's for the bottom?

davidsrsb · 21st January 2006, 11:55 AM

I have seen some unusual speaker designs (ribbon tweeters?) which fell to about 1R at 20kHz. Try overdesigning for that one. It seems crazy but actually measuring the output transistor status in real time is cheaper than more robust ( and more quantity) output transistors.

fscarpa58 · 31st January 2006, 07:26 AM

hi all

Quote:

From Rods pages:
For the 3 ohm case, a reactive load (at 45° phase angle) can be simulated by using a 477uH inductor in series with the 3 ohm resistor (for a frequency of 1kHz)

thanks for the reference, Jens

Federico

21st January 2006, 02:45 AM	#12
CBS240 diyAudio Member Join Date: Aug 2005 Location: K-town	It seems to me that it would be easier and cheaper in the long run to just over design the amp for what you are going to listen too. This would take out the potential of the elaborate protection circuits to affect the quality of the audio signal and keep it back to basics. If SOA is such a problem for you, and you have no problem with making some sort of complex protection circuit, then maybe you should investigate class G (or maybe H) designs. I like G better because the top rail follows the audio and doesn't introduce HF switching noise. Perhaps Fets for the top rail and BJT's for the bottom? __________________ All the trouble I've ever been in started out as fun......

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
Need help with NAD amp! Goes in protection	silversweden	Car Audio	42	24th January 2008 08:29 PM
DC-protection?	Skorpio	Solid State	4	1st December 2007 09:09 AM
speaker protection (OR) overload protection	myanmar	Solid State	7	13th July 2006 08:21 AM
protection	Dj BASS AMP	Solid State	7	26th March 2003 09:53 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

21st January 2006, 12:48 AM	#11
mastertech Banned Join Date: Mar 2005 Location: Australia	ok NP is coming to show you how, my two cents..

21st January 2006, 11:55 AM	#13
davidsrsb diyAudio Member Join Date: Dec 2005 Location: Kuala Lumpur	I have seen some unusual speaker designs (ribbon tweeters?) which fell to about 1R at 20kHz. Try overdesigning for that one. It seems crazy but actually measuring the output transistor status in real time is cheaper than more robust ( and more quantity) output transistors.