MJL4281A/4302A Amplifier or MOSFET's

zox2003 · 1st December 2006, 08:13 PM

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

FastEddy · 1st December 2006, 08:21 PM

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.)

zox2003 · 1st December 2006, 08:25 PM

What do you sugest (amplifier schematic)?

What is difficult about these?

EchoWars · 1st December 2006, 08:50 PM

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.

zox2003 · 1st December 2006, 08:52 PM

Am I will be able to get 150W on 4 ohms with 4 of these devices(+/-42V).

Schematic suggestion

MEGA-amp · 1st December 2006, 09:33 PM

Rod Elliott's P3A fits the bill (sort of) with your voltage and devices.

P3A

XEAGLEKEEPER · 1st December 2006, 09:50 PM

five pair will get you 500 watt with a +/- 70vdc ie.ESP P68 subwoofer amp

ReidK · 1st December 2006, 09:56 PM

Zox,

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

Reid

EchoWars · 1st December 2006, 11:35 PM

You can always BUY them and have 'em in three or four days...

XEAGLEKEEPER · 2nd December 2006, 12:23 AM

They are about 10 bucks apiece from Mouser. I got 4 pair on ebay for 5 bucks apiece.

1st December 2006, 08:13 PM	#1
zox2003 diyAudio Member Join Date: Nov 2004 Location: usa	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

1st December 2006, 09:50 PM	#7
XEAGLEKEEPER diyAudio Member Join Date: Jan 2006 Location: central Iowa	five pair will get you 500 watt with a +/- 70vdc ie.ESP P68 subwoofer amp __________________ Ret. USAF... AKA- Avionic * Solder slinger for hire...*

2nd December 2006, 12:23 AM	#10
XEAGLEKEEPER diyAudio Member Join Date: Jan 2006 Location: central Iowa	They are about 10 bucks apiece from Mouser. I got 4 pair on ebay for 5 bucks apiece. __________________ Ret. USAF... AKA- Avionic * Solder slinger for hire...*

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1st December 2006, 08:21 PM	#2
FastEddy diyAudio Member Join Date: Jun 2006 Location: North Californie	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.)

1st December 2006, 08:25 PM	#3
zox2003 diyAudio Member Join Date: Nov 2004 Location: usa	What do you sugest (amplifier schematic)? What is difficult about these?

1st December 2006, 08:50 PM	#4
EchoWars diyAudio Member Join Date: Dec 2002 Location: Left of the Dial	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.

1st December 2006, 08:52 PM	#5
zox2003 diyAudio Member Join Date: Nov 2004 Location: usa	Am I will be able to get 150W on 4 ohms with 4 of these devices(+/-42V). Schematic suggestion

1st December 2006, 09:33 PM	#6
MEGA-amp diyAudio Member Join Date: Oct 2003 Location: Newington, CT	Rod Elliott's P3A fits the bill (sort of) with your voltage and devices. P3A

1st December 2006, 09:56 PM	#8
ReidK diyAudio Member Join Date: Jan 2006 Location: Los Angeles (a.k.a. Hell on Earth)	Zox, When did you order your samples? I've been waiting for two months. Reid

1st December 2006, 11:35 PM	#9
EchoWars diyAudio Member Join Date: Dec 2002 Location: Left of the Dial	You can always BUY them and have 'em in three or four days...

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