small, but high quality amp

Sukandar · 12th November 2003, 11:58 PM

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

hitsware · 13th November 2003, 12:45 AM

0 feedback

Eva · 13th November 2003, 02:34 AM

Lots of distortion

GRollins · 13th November 2003, 02:38 AM

Build a Zen or Mini-A.

Grey

hitsware · 13th November 2003, 02:52 AM

Quote:

Originally posted by Eva
Lots of distortion

THD < 0.6 %
100Hz to 10kHz
0 Watts to 6 Watts

Sounds Amazing

Steve Eddy · 13th November 2003, 03:04 AM

Quote:

Originally posted by hitsware
THD < 0.6 %
100Hz to 10kHz
0 Watts to 6 Watts

Sounds Amazing

Too many parts. Take out about half a dozen and it'll sound even better.

se

hitsware · 13th November 2003, 03:18 AM

Quote:

Originally posted by Steve Eddy

Too many parts. Take out about half a dozen and it'll sound even better.

se

Yep....If I could find a xfmr that would give me an about x10 voltage gain. With maybe 10 kOhm in? More realistically perhaps 600 Ohm in.........

and drive the fets ........

dimitri · 13th November 2003, 03:27 AM

with the same output FETs ...
based on Hiraga 20W class A ...

hitsware · 13th November 2003, 03:33 AM

Quote:

Originally posted by dimitri
with the same output FETs ...
based on Hiraga 20W class A ...

IMO these outputs are the greatest thing since peanut butter. This circuit is a little differant in that it uses feedback.

Steve Eddy · 13th November 2003, 03:53 AM

Quote:

Originally posted by hitsware
Yep....If I could find a xfmr that would give me an about x10 voltage gain. With maybe 10 kOhm in? More realistically perhaps 600 Ohm in......... and drive the fets ........

Well, if you're using a digital source, your Red Book output is 2 volts RMS. To get your 6 watts or so, you'd only need a gain of 5.

I finally got 'round to ordering up the transformers so should let you know how it sounds in a couple weeks. I've already done a lower current version (about 160mA) using 1:1 transformers for driving headphones and it sounds fantastic. Just need to scale it up with some 1:5 transformers and higher current output devices.

se

12th November 2003, 11:58 PM	#1
Sukandar diyAudio Member Join Date: Nov 2003 Location: Berlin	small, but high quality amp 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

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13th November 2003, 02:34 AM	#3
Eva diyAudio Member Join Date: Oct 2003 Location: Near the sea	Lots of distortion

13th November 2003, 02:38 AM	#4
GRollins diyAudio Member Join Date: Feb 2001 Location: Columbia, SC	Build a Zen or Mini-A. Grey