Hi all - My boards arrived in the USA (Danbury, CT) on Saturday.
You'd think that a letter from Sweden to Germany should be faster than from Sweden to the USA. "It ain't necessarily so."
Cheers,
Micha
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20Vdc and 84Vdc are limits.Pers-Anders:
I got my boards today.
I have a question regarding the transformers, the spec sheet for the LM4780 calls for 20 to 84V range, what seems to work best for this design?
Thanks,
Patrick
For an 8ohms speaker you can use 40Vdc to 78Vdc
For 4ohms speaker you can use 40Vdc to 62Vdc
Both will work below 40Vdc, but I would not recommend the 4780 for such low voltages.
In both cases you must cool the dual channel chip adequately. It is trying to dissipation the waste heat from those two channels through a tiny interface contact area.
For the heatsink questions in US, I used one from HeatsinkUSA.
The thread http://www.diyaudio.com/forums/chip-amps/280949-newbee-build-pa03-amp-lm4780.html has a lot of good information on a couple of builds.
The thread http://www.diyaudio.com/forums/chip-amps/280949-newbee-build-pa03-amp-lm4780.html has a lot of good information on a couple of builds.
I'll suppose that all pcb's are at their right destinations by now.
If destination means addressee, no. I've received nothing until now.
Micha
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