concept amp by Steve Eddy help required

Raj1 · 16th October 2005, 07:45 AM

Hi,

I would like to give this amp a try, just out of interest. I know this sort of stuff doesn't appeal to everyone, but I would still like to give it a try, without rousing negative posts......

http://www.diyaudio.com/forums/attac...amp=1059159077

Can anyone suggest the mosfets I should use and the rail volatages required?

1 watt should be fine as I have very sensitive speakers and don't listen too loud.

At the moment I have regulated supplies with 50v torroids, but perhaps the rails will be to high at 70 v? However it would be nice if I could use the parts I already have without purchasing more.

If anyone can suggest mosfets that can handle the 70v voltage for around a 1W ouptut it would be great.

many thanks

Raja

PS I have plenty of heatsinks to use.....

PMA · 16th October 2005, 08:08 AM

Pitty that Steve has been sinbinned. The more voltage, the more linearity, as there is no other means to improve it

Raj1 · 16th October 2005, 08:31 AM

Hi PMA,

can you please suggest which mosfet to use etc?

Thanks
Raja

PMA · 16th October 2005, 08:38 AM

Let's wait for Steve to advise. In case of power stage, I would use IRFP240, 244 or 350.

SY · 16th October 2005, 11:56 AM

Steve will be out in two days.

AndrewT · 16th October 2005, 04:18 PM

Hi,
I don't know the whole story but that deleted thread was a bit extreme. What else do you call an enclosed transformer that has it's coat taken off and still inject a little humour? I was waiting for some tech info coming back.

The transformer shown in this thread will reflect a multplied impedance into the fets (varies as the square of the turns ratio). This circuit will probably work better if the input impedance is kept low and the transformer does the opposite. What's the solution?

tlf9999 · 17th October 2005, 07:12 AM

I have done that with a radio shack signal transformer, reversely connected, to drive an irf540.

It sounded fine. the only problem I see is that you will have to use a very powerful driver to get good quality sound. In my case, my driver was biased over 80ma for good sound.

the radio shack signal transformer (<$5 each) has a 1:10x ratio (give or take a few).

16th October 2005, 07:45 AM	#1
Raj1 diyAudio Member Join Date: Jan 2003 Location: UK	concept amp by Steve Eddy help required Hi, I would like to give this amp a try, just out of interest. I know this sort of stuff doesn't appeal to everyone, but I would still like to give it a try, without rousing negative posts...... http://www.diyaudio.com/forums/attac...amp=1059159077 Can anyone suggest the mosfets I should use and the rail volatages required? 1 watt should be fine as I have very sensitive speakers and don't listen too loud. At the moment I have regulated supplies with 50v torroids, but perhaps the rails will be to high at 70 v? However it would be nice if I could use the parts I already have without purchasing more. If anyone can suggest mosfets that can handle the 70v voltage for around a 1W ouptut it would be great. many thanks Raja PS I have plenty of heatsinks to use.....

16th October 2005, 11:56 AM	#5
SY diyAudio Moderator Join Date: Oct 2002 Location: Austin, TX Blog Entries: 1	Steve will be out in two days. __________________ “Listening to records is like ****ing a picture of Brigitte Bardot.” - Sergiu Celibidache

16th October 2005, 04:18 PM	#6
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	Hi, I don't know the whole story but that deleted thread was a bit extreme. What else do you call an enclosed transformer that has it's coat taken off and still inject a little humour? I was waiting for some tech info coming back. The transformer shown in this thread will reflect a multplied impedance into the fets (varies as the square of the turns ratio). This circuit will probably work better if the input impedance is kept low and the transformer does the opposite. What's the solution? __________________ regards Andrew T.

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
Eddy Currents	jsa_ind	Solid State	3	14th May 2006 09:05 AM
The 'Interface' - Steve Eddy?	shuang	Everything Else	107	30th December 2003 02:35 PM
Steve & Frank & Steve start a Love-In	Steve Eddy	Everything Else	25	6th November 2002 06:02 PM


	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

16th October 2005, 08:08 AM	#2
PMA diyAudio Member Join Date: Apr 2002 Location: Prague, Kitakyushu, Fukuoka	Pitty that Steve has been sinbinned. The more voltage, the more linearity, as there is no other means to improve it

16th October 2005, 08:31 AM	#3
Raj1 diyAudio Member Join Date: Jan 2003 Location: UK	Hi PMA, can you please suggest which mosfet to use etc? Thanks Raja

16th October 2005, 08:38 AM	#4
PMA diyAudio Member Join Date: Apr 2002 Location: Prague, Kitakyushu, Fukuoka	Let's wait for Steve to advise. In case of power stage, I would use IRFP240, 244 or 350.

17th October 2005, 07:12 AM	#7
tlf9999 Account Disabled Join Date: May 2005 Location: none	I have done that with a radio shack signal transformer, reversely connected, to drive an irf540. It sounded fine. the only problem I see is that you will have to use a very powerful driver to get good quality sound. In my case, my driver was biased over 80ma for good sound. the radio shack signal transformer (<$5 each) has a 1:10x ratio (give or take a few).

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

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