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Old 1st December 2006, 08:13 PM   #1
zox2003 is offline zox2003  United States
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Default MJL4281A/4302A Amplifier or MOSFET's

Question:

I just received some of MJL4281 and MJL4302 samples from on semi.

In what amplifier configuration they coould be used(schematic or link)?

How many devices per channel (for 4 and 8 ohms) on +/- 42V(what power could I expect?


Quality of MJL's?

MJL's or MOSFET's?

Regards
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Old 1st December 2006, 08:21 PM   #2
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http://www.onsemi.com/pub/Collateral/MJL4281A-D.PDF

NPN / PNP transistor pair for output stage solid state amp. These are not MOSFET or JFET at all, just "oridinary" silicon transistors and can be quite good in the right, "push / pull", Class A or A/B amp design. (Difficult to exactly balance in production and elimination or reduction of the 0 Volt crossing point.)

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Old 1st December 2006, 08:25 PM   #3
zox2003 is offline zox2003  United States
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What do you sugest (amplifier schematic)?

What is difficult about these?
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Old 1st December 2006, 08:50 PM   #4
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Nothing is difficult about them...they are fine devices.

With +/-42V, you likely will have about a 80 to 95WPC amp, and you'd need only one NPN and one PNP of those devices per channel.

Amp design? Shop around.
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Old 1st December 2006, 08:52 PM   #5
zox2003 is offline zox2003  United States
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Am I will be able to get 150W on 4 ohms with 4 of these devices(+/-42V).

Schematic suggestion
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Old 1st December 2006, 09:33 PM   #6
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Rod Elliott's P3A fits the bill (sort of) with your voltage and devices.

P3A
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Old 1st December 2006, 09:50 PM   #7
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five pair will get you 500 watt with a +/- 70vdc ie.ESP P68 subwoofer amp
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Old 1st December 2006, 09:56 PM   #8
ReidK is offline ReidK  United States
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Zox,

When did you order your samples? I've been waiting for two months.

Reid
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Old 1st December 2006, 11:35 PM   #9
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You can always BUY them and have 'em in three or four days...
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Old 2nd December 2006, 12:23 AM   #10
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They are about 10 bucks apiece from Mouser. I got 4 pair on ebay for 5 bucks apiece.
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