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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.

Sherlock Holmes was not a Doctor. His companion was Dr. Watson so maybe that was your confusion. I hope this helps.

Go with the 18Fxxx part and use the www.ccsinfo.com C compiler. I have converted many of my assembly program to C and have simplified the code considerably.

Thanks for all the help. It looks like I will have to go the LM2575 route. I plugged one into 24V pulling 200ma and the component barely heats up. I had some inductors custom wound for this once, I will have to do it again. The only inductors I could find from Mouser were physically large and bulky....

I buy a pc board for my product that uses an LM340T-5 regulator. When powered by 12V (250 ma) it does not heat up too much. My customers want to power the device from 24VDC. The regulator gets super-hot when doing this and I think 24v is a little too high for the specs. I tried an LM2940CT-5.0 (work...

Look at Phillips Semiconductor TDA5051A. It works up to 2400 baud. I have been experimenting with them. Just beware of mistakes in the datasheet. Get ahold of an application engineer.

http://www.walrus.com/~raphael/html/mp3.html
$123 kit
or<p>www.tetraphon.com
$150 done<p>Circuit cellar had an article about interfacing a pic to a compact flash. Then you will need an MP3 decoder data sheet.<p>www.vlsi.fi/datasheets/vs1001.pdf

Just because I have never tried this, just curious if anyone else has. Can an electric guitar be plugged into the line-in or mic-in of a computer sound card and get any decent sound levels? Thanks.

N9AOK,<p>Draw your schematic and save. Now start the pcb lay out software. Now choose the File menu and choose "Link Schematic to PCB...." Now you have to have a pcb component for every component on the schematic. The software will flag you if something is missing.

www.expresspcb.com<p>Free schematic and board layout. Link schematic to board.

I have a device (Unit A) that will require DC power 10 to 24v DC in. The power must be supplied by the installer. Unit A will be connected through a serial port to another device (Unit B). Unit B has it's own power source. It is powered by AC lines and creates it's own internal DC power.<p>I want to...

Let me ask:<p>What is the 120vac device? Is it something that is creating dc itself? If so, can the battery directly power the circuitry?

Send me a message at [email protected]<p>Do you want microprocessor control? I don't usually use discrete logic. Thanks.

LM2907<p>ICL7137<p>
You will need a frequency to voltage converter and an analog to digital converter with display driver.<p>[ July 24, 2003: Message edited by: ljbeng ]<p>[ July 24, 2003: Message edited by: ljbeng ]</p>

Send me the details please. I have done a number of temperature related projects using PIC microprocessors. Thanks.<p>[email protected]