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Old 13th November 2003, 04:26 AM   #11
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what will be the Zin ?
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Old 13th November 2003, 04:32 AM   #12
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Quote:
Originally posted by hitsware
what will be the Zin ?
About 1.5k.

se
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Old 13th November 2003, 04:38 AM   #13
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will your generic 'red cd' put out a good 2V into 1.5K?
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Old 13th November 2003, 05:25 AM   #14
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Quote:
Originally posted by hitsware
will your generic 'red cd' put out a good 2V into 1.5K?
If it's output impedance isn't unusually high. The transformer in question is optimized for a 150 ohm source impedance. So if you're in that range you're looking at a little under 1dB loss so you'll get about 1.82 volts at the primary and about 9 volts at the secondary. So you can still get close to 5 watts at the end of the day. Which would be a difference of just over 1dB compared to 6 watts.

By the way, I just posted the 1:1 headphone version here:

http://www.diyaudio.com/forums/showt...145#post264145

se
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Old 13th November 2003, 10:18 AM   #15
SDF is offline SDF  France
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As soon as simple and with the same Mosfet:

http://perso.wanadoo.fr/jm.plantefeve/sche.html
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Old 13th November 2003, 10:52 AM   #16
Dirk is offline Dirk  Belgium
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I would call a 10W SE class A amplifier less than small and portable

Anybody a discrete high-quality low-power suggestion in class AB?

Dirk
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Old 13th November 2003, 04:01 PM   #17
GregGC is offline GregGC  Canada
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Default Re: small, but high quality amp

Quote:
Originally posted by Sukandar
Hi,
I'm looking for schematics or general design remarks about amp designs for portable gear (not necessarily battery powered though)

So far I've been playing around with those hybrid modules like the LM1875 or TDA1562 but I'm not really happy with their sound so I'm looking for alternatives, even if it means going discrete

hope this is the right place to ask
thanks
Sukandar
What exactly didn't you like in the way LM1875/3875 sounds (the version you build of course)?
I beleave the LM3875 is the perfect candidate.
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Old 13th November 2003, 05:35 PM   #18
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Cool Re: small, but high quality amp

Quote:
Originally posted by Sukandar
Hi,
I'm looking for schematics or general design remarks about amp designs for portable gear (not necessarily battery powered though)

So far I've been playing around with those hybrid modules like the LM1875 or TDA1562 but I'm not really happy with their sound so I'm looking for alternatives, even if it means going discrete

hope this is the right place to ask
thanks
Sukandar
Hi Sukandar,
May be the Son of Ampzilla or the Grandson.
http://home.kimo.com.tw/skychutw/ampzilla/index.html
Must be possible to use FETs for the inputstage like 2SK389 & 2SJ109....
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Old 14th November 2003, 07:39 AM   #19
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hi sukandar,

how about trying this, AN7178. its a dual channel 12 pin amp rated at 5.8w per channel. you can power it from 9v to 16v.
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Old 14th November 2003, 10:19 PM   #20
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Quote:
small, but high quality amp
sukanda,
please give more information on the use of the device you want to build. The smallest portable amp i build so far is battery powered, about 1*1*2 cm , 1W based on SSM2211 SMD chip.

A real high quality amp is something like http://www.passdiy.com/projects/zenv4-1.htm and this is some kg, not portable anymore, and i doubt you have portable speakers to have any advantage on such an amp in mobile use.
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