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Old 1st August 2005, 10:47 PM   #1
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Default 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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Old 1st August 2005, 11:37 PM   #2
sam9 is offline sam9  United States
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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.
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Old 2nd August 2005, 02:52 AM   #3
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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).
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Old 2nd August 2005, 03:18 AM   #4
sam9 is offline sam9  United States
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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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