Project 100W MJ15003 MJ15004

Risto80 · 29th June 2007, 09:50 AM

The Web Page that I found is:
http://aktobos.wz.cz/100w.html

There is a amplifier its uses one pair of mj15003/04
I like to use as a car amp wit subwoofer of 400W
Can it handle it or wath?

richie00boy · 29th June 2007, 10:54 AM

You need a SMPS to power the amp in a car. 100W in a car should be OK.

Risto80 · 29th June 2007, 11:42 AM

I have design SMPS +/- 35V, but the question is is this amplifier can handle 400wRMS suboofer or will be broken

richie00boy · 29th June 2007, 12:23 PM

It will be fine. Amps don't 'handle' speaker power, speakers 'handle' the power they are given.

You could have a 100W, 400W or 1000W speaker, as far as the amps is concerned as long as they are all the same impedance it doesn't care.

AndrewT · 1st July 2007, 03:46 PM

Hi,
1pair of MJ15003/4 will manage about 125W into 3ohm from +-35Vdc using +-30mF if you can keep them cool enough to survive.
2ohm loading can only reach 28degree phase angle @ about 170W.

sandyK · 1st July 2007, 10:27 PM

Andrew
I like your remark about keeping them cool enough to survive.
One pair is best kept to 50W, and 2 pairs for 100W into 4 ohms.
SandyK

AndrewT · 1st July 2007, 10:58 PM

Hi,
2pair should be able to go to 180W into 2ohm @ 60degree phase angle and Tc<60degC.
But 1ohm can only manage 25degree phase angle.

It seems that 1pair could make a reasonable 4ohm amplifier but need blown sinks.
2pair would do as a 2ohm amplifier with a big unblown sink.

sandyK · 1st July 2007, 11:08 PM

Andrew
The trouble is that many people skimp on the size of the heatsinks, and don't use fans for higher power versions.
SandyK

29th June 2007, 09:50 AM	#1
Risto80 Banned Join Date: Apr 2004 Location: Skopje	Project 100W MJ15003 MJ15004 The Web Page that I found is: http://aktobos.wz.cz/100w.html There is a amplifier its uses one pair of mj15003/04 I like to use as a car amp wit subwoofer of 400W Can it handle it or wath?

29th June 2007, 10:54 AM	#2
richie00boy Did it Himself diyAudio Member Join Date: Nov 2003 Location: Gloucestershire, England, UK	You need a SMPS to power the amp in a car. 100W in a car should be OK. __________________ www.readresearch.co.uk my website for UK diy audio people - designs, PCBs, kits and more

29th June 2007, 11:42 AM	#3
Risto80 Banned Join Date: Apr 2004 Location: Skopje	HI I have design SMPS +/- 35V, but the question is is this amplifier can handle 400wRMS suboofer or will be broken

29th June 2007, 12:23 PM	#4
richie00boy Did it Himself diyAudio Member Join Date: Nov 2003 Location: Gloucestershire, England, UK	It will be fine. Amps don't 'handle' speaker power, speakers 'handle' the power they are given. You could have a 100W, 400W or 1000W speaker, as far as the amps is concerned as long as they are all the same impedance it doesn't care. __________________ www.readresearch.co.uk my website for UK diy audio people - designs, PCBs, kits and more

1st July 2007, 03:46 PM	#5
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	Hi, 1pair of MJ15003/4 will manage about 125W into 3ohm from +-35Vdc using +-30mF if you can keep them cool enough to survive. 2ohm loading can only reach 28degree phase angle @ about 170W. __________________ regards Andrew T.


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1st July 2007, 10:27 PM	#6
sandyK diyAudio Member Join Date: Apr 2007 Location: Sydney	Project 100W MJ15003 MJ15004 Andrew I like your remark about keeping them cool enough to survive. One pair is best kept to 50W, and 2 pairs for 100W into 4 ohms. SandyK

1st July 2007, 10:58 PM	#7
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	Hi, 2pair should be able to go to 180W into 2ohm @ 60degree phase angle and Tc<60degC. But 1ohm can only manage 25degree phase angle. It seems that 1pair could make a reasonable 4ohm amplifier but need blown sinks. 2pair would do as a 2ohm amplifier with a big unblown sink. __________________ regards Andrew T.

1st July 2007, 11:08 PM	#8
sandyK diyAudio Member Join Date: Apr 2007 Location: Sydney	Project 100W MJ15003 MJ15004 Andrew The trouble is that many people skimp on the size of the heatsinks, and don't use fans for higher power versions. SandyK

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