HI! I can supply you some pcbs, professionally made, double layer with soldermask and silkscreening! Based on gerber files directly from national. I had 11 of them, now I have 5 of them, but I can make others!
I can sell them for 23 $ us dollars. If interested, contact me at animalepesante@katamail.com ! I don't read the forum every day...
bye bye!
Davide
I can sell them for 23 $ us dollars. If interested, contact me at animalepesante@katamail.com ! I don't read the forum every day...
bye bye!
Davide
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Apologies for bumping this old thread 
I finally got around to assembling my boards, but looking at the datasheet for the LM4651 gets me a little confused: The resistors Rv1 and Rv2 are 750R on the schematic and 750k in the BoM. Similarly, the 12V zeners are rated 1W on the schematic and 500mW in the BoM. Which of these are correct?
/U.
I finally got around to assembling my boards, but looking at the datasheet for the LM4651 gets me a little confused: The resistors Rv1 and Rv2 are 750R on the schematic and 750k in the BoM. Similarly, the 12V zeners are rated 1W on the schematic and 500mW in the BoM. Which of these are correct?
/U.
750 ohms is correct. Those resistors are just there to limit current on the 12V zeners. The 12V zeners are found by using 22V (worst case) - 12V = 10V/750 ohms = 13mA * 12V = 160mW. So 500mW is just fine. You can use 500mW and up and not have a problem. Even 250mW if they make such things. The resistor value in the BOM is a typo. BTW, get these ICs while you can, they are on lifetime buy and will not be around forever.
-SL
-SL
Rodo said:
You could find document "ClassD_Design_Guide13.xls" in link below:
http://www.national.com/appinfo/audio/files/ClassD_Design_Guide13.xls
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