Lower supply rails for this amp?

mik · 6th June 2003, 07:17 PM

Can this amp run on +40/-40 supply rails?

Thanks!

http://www.futura-shop.com/pdf_ita/7100-FT15K.pdf

Christer · 6th June 2003, 08:51 PM

Shouldn't be any problem as far as I can see, but the maximum
output power will be lower, of course. A rough calculation would
be around 55W in 8 Ohms.

Maybe one should lower the value of R3 correspondingly, but
that is probably not necessary.

mik · 6th June 2003, 09:15 PM

Thanks Christer!
I think that 55W in 8 ohms are enough !

djk · 7th June 2003, 09:32 PM

Change R3 to 39K

Because of the lateral MOS this amplifier will only do about 40W at 8 ohms with a simple ±40V supply.

The Hafler DH120, SE120 use about the same circuit and ±52V and do 60W/8R or 90W/4R(1Khz)

http://www.hafler.com/techsupport/index.asp?ID=3

mik · 11th June 2003, 10:22 AM

DJK
Thanks for your suggestions!

6th June 2003, 07:17 PM	#1
mik diyAudio Member Join Date: Dec 2001 Location: Serbia	Lower supply rails for this amp? Can this amp run on +40/-40 supply rails? Thanks! http://www.futura-shop.com/pdf_ita/7100-FT15K.pdf

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6th June 2003, 08:51 PM	#2
Christer diyAudio Member Join Date: Sep 2002 Location: Sweden	Shouldn't be any problem as far as I can see, but the maximum output power will be lower, of course. A rough calculation would be around 55W in 8 Ohms. Maybe one should lower the value of R3 correspondingly, but that is probably not necessary.

6th June 2003, 09:15 PM	#3
mik diyAudio Member Join Date: Dec 2001 Location: Serbia	Thanks Christer! I think that 55W in 8 ohms are enough !

7th June 2003, 09:32 PM	#4
djk diyAudio Member Join Date: Feb 2001 Location: USA	Change R3 to 39K Because of the lateral MOS this amplifier will only do about 40W at 8 ohms with a simple ±40V supply. The Hafler DH120, SE120 use about the same circuit and ±52V and do 60W/8R or 90W/4R(1Khz) http://www.hafler.com/techsupport/index.asp?ID=3

11th June 2003, 10:22 AM	#5
mik diyAudio Member Join Date: Dec 2001 Location: Serbia	DJK Thanks for your suggestions!