Source for 25 Watt Amp

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ljbeng
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Source for 25 Watt Amp

Post by ljbeng » Fri Aug 27, 2004 7:49 am

I need to amplify the output of a MP3 player, one channel, to 25 Watts. I need a single chip, 12V supply, readily available. Any suggestions? I have looked at the audio amplifier chips from Phillips. Are these easy to get in small (<25) quantities? Thanks.

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Edd
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Re: Source for 25 Watt Amp

Post by Edd » Fri Aug 27, 2004 11:34 am

Within the design criteria limitation of only 12volts Vcc , its hard to take away from the
utilization of the 2 Philips units below, utilizing absolute minumal off chip discrete components.<p>http://www.semiconductors.philips.com/a ... _CNV_2.pdf
Or the :
http://www.semiconductors.philips.com/a ... 1564_4.pdf
……not being sure of your needs of a combined 12+12W or separate 25W’s.
However, with either of them gobbling up some amps at that higher power level, if they happen to be portable battery pack powered.<p>73's de Edd
[email protected] ....……..(Interstellar~~~~Warp~~~Speed)
[email protected]..........(Firewalled-Spam*Cookies*Crumbs)<p> ;) ;)

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Externet
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Re: Source for 25 Watt Amp

Post by Externet » Fri Aug 27, 2004 2:54 pm

Hi ljbeng
Canibalize an autoradio and pull the output IC or saw off the PCB holding it and its heat sink.
Or, strip the whole autoradio from the cassette mechanism and use more of the circuitry, like tone controls and volume.
If you cannot find a quantity-1 integrated stereo amplifier, ask at any stereo/VCR repair shop (if still exist) for their local parts store. For shure they sell many types.
Miguel
- Abolish the deciBel ! -

Mike
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Re: Source for 25 Watt Amp

Post by Mike » Fri Aug 27, 2004 3:25 pm

There is an 80W 12V amp made by phillips, I'll need to see if I can get the link.<p>How bout an opa549 running in single supply mode? It will run off of 12VDC

toejam
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Re: Source for 25 Watt Amp

Post by toejam » Sat Aug 28, 2004 12:34 am

what is the impedance of the speaker system you are intending to drive?

ljbeng
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Re: Source for 25 Watt Amp

Post by ljbeng » Mon Aug 30, 2004 10:03 am

The speaker is an 8 ohm, 150Watt, Horn type speaker/driver made by Selenium (sp).

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