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Old 2nd August 2005, 08:49 PM   #1
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Default Need expert help on a project, ETI-488 100W

I want to know if it possible to bridge 4 or even more unit of this amp because I want to built a very strong amp, I can already get a 500VA 35-35 transformer for +- $102 just remember I life in South Africa itís R613.00 there

The resone why I want to use this ETI-480 because itís the only one I can make and understand well enough I already build 2 modules in other amp in my modified maranz model 1060, Itís all done with parts my friends give me and other stuff, so I where lucky there
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Old 2nd August 2005, 08:53 PM   #2
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And in my papers it tell me how to bridge 2 units but I donít understand that coz it sound like that dude also didnít know what heís talking about itís making me confessed

Is where a way to put more output transistors on a unit
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Old 3rd August 2005, 06:11 AM   #3
djk is offline djk
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A 35-0-35 500VA transformer will drive 350W/8R for one (bridged) channel. The MJ15003/04 would be best, but the drivers will need to be changed to MJE15028/29 (or higher PN), and mounted upside down (because pin-out is reversed). Other changes will also be needed.

If driving 4R the outputs will need to be doubled (if only driving 8R with REAL GOOD heatsinks one pair will be OK), and a bigger transformer used.

A 30-0-30 700VA transformer will drive 250W/8R in stereo, about 350W/4R (limited duty cycle).
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Old 7th August 2005, 02:22 PM   #4
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Can someone please give me all the problems this unit can give me and how to fix it, because I'm abut scared to power up the unit because the resisters "100 Ohms" you must put in place of the fuses is getting RED hot,
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