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Old 18th February 2007, 07:23 PM   #1
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Default Decent chip amp with asymmetric supply (similar to low-fi LM386)?

Hi

I have two sound cards that use the terrible LM386 chip amp for headphone output, and I'd like to mod them with some higher quality chip, if there is one that supports asymmetric supply. Is there one?


Thanks
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Old 24th February 2007, 03:51 AM   #2
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There is a chip called TBA820M (8pin) which delivers roughly 1W with asymmetric voltage. I remember that it has acceptable sound quality (better than the lm386) but needs quite a few external components, more than the lm386...
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Old 25th February 2007, 05:10 AM   #3
Nordic is offline Nordic  South Africa
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TDA1308 if you can still find it... saw a comparison table yesterday... these were also the chips that swung the highest level output

If one can believe the application notes at Ti, most opamps can be used off a single rail supply.

Click the image to open in full size.
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Old 25th February 2007, 05:23 AM   #4
lineup is offline lineup  Sweden
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Quote:
Originally posted by Nordic

TDA1308 if you can still find it...
saw a comparison table yesterday... these were also the chips that swung the highest level output

If one can believe the application notes at Ti, most opamps can be used off a single rail supply.
I know http://www.elfa.se/en/
has got TDA1308
Quote:
....
INA 134
LM 380
LM 386
SAE 800
TBA 820
LM 1036
TDA 1308
TDA 1560
LM 1875
LM 1876
LM 1877
....
TDA1308 is a dedicated little IC for Headphones applications.
I have had the idea to order it, and show my brother
how small a fairly good Headphones-Amp can be made
with modern IC technology.

Philips Datasheet:
http://www.nxp.com/acrobat_download/...DA1308_A_4.pdf

The TDA1308; TDA1308A is an integrated class-AB stereo headphone driver contained in
an SO8, DIP8 or a TSSOP8 plastic package.

Features:
Wide temperature range
No switch ON/OFF clicks
Excellent power supply ripple rejection

Low power consumption
Short-circuit resistant
High performance

High signal-to-noise ratio
High slew rate
Low distortion

Large output voltage swing


As Nordic says, it has high output voltage swing.
Think it would be perfect for 2-4 battery operation.
3-6 Volt DC



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Old 25th February 2007, 05:46 AM   #5
Nordic is offline Nordic  South Africa
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lol if you buy too many, send me two please.......... they are like $10 each here.

Supply voltage: +3.0 to +7.0 V
Supply current: 3 mA typ.
Max output power: 60 mW (THD <0.1 %)
Distortion at 0 dB: 0.03 % typ.
Signal/noise ratio: 110 dB typ.
Channel separation: 70 dB
Package: SO8
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Old 25th February 2007, 05:58 AM   #6
lineup is offline lineup  Sweden
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As you can see in ELFA catalog
( english version http://www.elfa.se/en/ has got prices in Euro )

Quote:
>>>>>>>>>>>>>>>>1- .... 10- .... 100-
TDA1308T 73-107-74 >>>1.85 1.58 0.80
If buy 10 pieces, you get to pay 15.80.
You will have to add VAT and of course some for transport.

Buying 100 will cost you 80 Euro.
You could then supply the whole of South-Africa, for a couple of years
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Old 25th February 2007, 06:03 AM   #7
Nordic is offline Nordic  South Africa
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it would suprise me if they could maintain an electricity supply that long.
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Old 21st June 2007, 12:47 AM   #8
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Gentlemen,

The easiest solution ist to get hold of an elder Acer CD-ROM reader, it contains a Philips TDA 1038, other CD-ROM players from Samsung, contain PT2038, which has same pinout and characteristics.

I used such chip to repair a Noxon2audio internet receiver. I used a small saw and cut out the amplifier part.... it works on 5 volts and has very low hiss.

good luck
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