Cheapest Solution

bjackson · 1st August 2005, 10:47 PM

I need:
2 x 15watts @ 6ohm
1 x 30 watts @ 4 ohm

What is the cheapest way for me to do this, will be ran off of 120v mains.

sam9 · 1st August 2005, 11:37 PM

E-bay?

Something like this:

http://cgi.ebay.com/Working-Pioneer-...QQcmdZViewItem

or this:
http://cgi.ebay.com/Sony-TA-A400-int...QQcmdZViewItem

Cheap was the criterion, right? Or did you mean something you could build?

Then try a pair of these:
http://cache.national.com/ds/LM/LM3875.pdf

Just follow the application note.

A 15-0-15 transformer will let you build a power supply will give the appropriate rail voltage. You will probably want a VA rating of 100 for two channels of heavy 4-ohm use. Use am enclosed E-I type - at this power level they are common and dirt cheap. You should be able to find these in Digikey or Jameco l.

If you want something discrete rather than an IC amp, look a G,Randy Slone "Audiophiles Project Source Book", page 149. Increase the transformer rating as decribed and add a third parrallel output device. (Or maybe substitute TIP3055/2955). Ibuilt this exactly as decribed and it quite nice. It will blow away the IC-amps without mercy.

bjackson · 2nd August 2005, 02:52 AM

I meant cheapest DIY solution, I am planning on putting this inside of a speaker system, so that's my use, so it needs to be efficent, I am making an active monitor, essentially (although it's not a monitor in the fact that it is decidedly low-fi).

sam9 · 2nd August 2005, 03:18 AM

OK, you want an IC amp.

Suggest you look at http://sound.au.com

Click Projects, then
Click Power Amps
Browse these. There should be at least one that will do the job.

1st August 2005, 10:47 PM	#1
bjackson diyAudio Member Join Date: Dec 2004 Location: Illinois	Cheapest Solution I need: 2 x 15watts @ 6ohm 1 x 30 watts @ 4 ohm What is the cheapest way for me to do this, will be ran off of 120v mains.

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1st August 2005, 11:37 PM	#2
sam9 diyAudio Member Join Date: Jun 2002 Location: Left Coast	E-bay? Something like this: http://cgi.ebay.com/Working-Pioneer-...QQcmdZViewItem or this: http://cgi.ebay.com/Sony-TA-A400-int...QQcmdZViewItem Cheap was the criterion, right? Or did you mean something you could build? Then try a pair of these: http://cache.national.com/ds/LM/LM3875.pdf Just follow the application note. A 15-0-15 transformer will let you build a power supply will give the appropriate rail voltage. You will probably want a VA rating of 100 for two channels of heavy 4-ohm use. Use am enclosed E-I type - at this power level they are common and dirt cheap. You should be able to find these in Digikey or Jameco l. If you want something discrete rather than an IC amp, look a G,Randy Slone "Audiophiles Project Source Book", page 149. Increase the transformer rating as decribed and add a third parrallel output device. (Or maybe substitute TIP3055/2955). Ibuilt this exactly as decribed and it quite nice. It will blow away the IC-amps without mercy.

2nd August 2005, 02:52 AM	#3
bjackson diyAudio Member Join Date: Dec 2004 Location: Illinois	I meant cheapest DIY solution, I am planning on putting this inside of a speaker system, so that's my use, so it needs to be efficent, I am making an active monitor, essentially (although it's not a monitor in the fact that it is decidedly low-fi).

2nd August 2005, 03:18 AM	#4
sam9 diyAudio Member Join Date: Jun 2002 Location: Left Coast	OK, you want an IC amp. Suggest you look at http://sound.au.com Click Projects, then Click Power Amps Browse these. There should be at least one that will do the job.

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