I need something at low cost. "used"

J.k.Wilson · 16th February 2006, 11:16 PM

Ok, i'm trying to get out as cheap as possible. A buddy of mine is designing a box for my new 18"er. But i need to power this thing at 8ohms at 2-300 watts. Whats the cheapest way of powering this? Most everybody says a plate amp, is that the censis here aswell? I would love to get the best but thats not in the cards right now. I just need something CHEAP till my cash flow increases. Thanks for any help you could provide.

metallicus69 · 17th February 2006, 06:30 AM

Hi,
I think a very cheap solution is a bridge amplifier.
I used temporary a circuit based on tda7250 with power darlingtonsMJL11015/11016 supplyed with +/- 34V and a bridge adapter, that delivered 220W; it worked pretty well and because of the low voltages involved the price was not very high! But I must mention that the transformer in the power supply must deliver a very high power - for a stereo pair i used a 1kW transformer, with very THICK conductor in the secondary!
Good luck and best regards!

16th February 2006, 11:16 PM	#1
J.k.Wilson diyAudio Member Join Date: Aug 2005	I need something at low cost. "used" Ok, i'm trying to get out as cheap as possible. A buddy of mine is designing a box for my new 18"er. But i need to power this thing at 8ohms at 2-300 watts. Whats the cheapest way of powering this? Most everybody says a plate amp, is that the censis here aswell? I would love to get the best but thats not in the cards right now. I just need something CHEAP till my cash flow increases. Thanks for any help you could provide.

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17th February 2006, 06:30 AM	#2
metallicus69 diyAudio Member Join Date: Aug 2005	Hi, I think a very cheap solution is a bridge amplifier. I used temporary a circuit based on tda7250 with power darlingtonsMJL11015/11016 supplyed with +/- 34V and a bridge adapter, that delivered 220W; it worked pretty well and because of the low voltages involved the price was not very high! But I must mention that the transformer in the power supply must deliver a very high power - for a stereo pair i used a 1kW transformer, with very THICK conductor in the secondary! Good luck and best regards!

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