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Old 30th June 2003, 02:19 PM   #1
Higo is offline Higo  Argentina
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Question New Amp: Hex-Fet or LM 3875

Hello guys,
I`m wanna build my first amp. The choices are:
1- Amp based in LM3875 CI or something similar
2- AN 948 (HEX-FET 60W/4ohm Amplifier or a modifcated version Almost final AN948 mosfet amp)

The intention is use the amp with this Preamp : http://www.normankoren.com/Audio/Spi....html#NewPhono (the purist version) that presently I`m building...

Which do you recommend? LM version or Mosfet?. Any advice will be apreciated.
Thanks a lot
Marcelo.
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Old 2nd July 2003, 01:21 PM   #2
Higo is offline Higo  Argentina
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Any advice....
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Old 2nd July 2003, 01:44 PM   #3
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I would go with the lm3875...seems to be simpler than the hexfet designs...and they are pretty good sounding as far as I can tell...
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Old 2nd July 2003, 04:55 PM   #4
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I vote lm3875 too.
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Old 2nd July 2003, 06:52 PM   #5
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For a first amp, a Gain Clone type device would be ideal: easy construction, plenty of advice (and opinions) from other builders and very easy construction.

Try other, more complicated, designs when your GC is to your satisfaction!

Nice one,
David.
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Old 2nd July 2003, 07:23 PM   #6
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why not try both? I am looking also at a p3a or Nelson's Mosfet citation 12 (essentially the same as an948).

Does anyone realize that Motorolla also has a 100w/200w highperformance amp in their application notes?
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Old 2nd July 2003, 08:29 PM   #7
Higo is offline Higo  Argentina
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Thanks for your answers guys.
Well, the idea is bi amp. First I wanna build a Mosfet Amp for mid/high frecuency. The LM3875 amp for woofer??? ...I don`t know
Marcelo
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Old 2nd July 2003, 08:45 PM   #8
Higo is offline Higo  Argentina
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Quote:
Originally posted by millwood

Does anyone realize that Motorolla also has a 100w/200w highperformance amp in their application notes?
Where? I can not find the Ap in the motorola web site
Thanks.
Marcelo
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Old 2nd July 2003, 09:36 PM   #9
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it is available from On Semi, the ex-Motorola semi conductor business, titled "100 and 200 watt high fidelity audio amplifier utilizing a wideband-low feedback design". It uses the 3281/1302 twin.

http://www.onsemi.com/pub/Collateral/AN1308-D.PDF

enjoy.
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