Your PCB design seems to be excellent ! Could you post the layout here?
Actually I realized that the SMD pinout is much better to deal with than the through hole version, am I right?
Actually I realized that the SMD pinout is much better to deal with than the through hole version, am I right?
I don't think, that my pcb excellent...but hope that it's quite nice 🙂
SMD better than through hole due it small sizes, hence lower parasitic inductance.
here is pcb project ( layout 4.0 or layout 5.0):
SMD better than through hole due it small sizes, hence lower parasitic inductance.
here is pcb project ( layout 4.0 or layout 5.0):
The chip runs pretty cool with a small heatsink, about 40°C.
But the coil is running much more hot ! About 50°C. Should I replace them? At full volume or idle, the coils runs HOT.
But the coil is running much more hot ! About 50°C. Should I replace them? At full volume or idle, the coils runs HOT.
I've wound another air-core inductor, this time with wire 14AWG (much thicker), but it still not running cold. The chip runs very cool, everything works amazingly well, but the inductor (the bigger) is just a little warm. Is this fine?
Bender, thank you very much !
My PCB is very weird, as I can't use dual layer boards, and the pinout doesn't help. All 100nF bypass caps are connected Point to point bellow the chip
The coils are outside the board also 😱 😀
Well, as I had a lot of care with the ground, and I placed all the bypass caps (althought p2p), it works perfect
What program did you use to make the board? Eagle doesn't open .lay files.
Best Regards !
My PCB is very weird, as I can't use dual layer boards, and the pinout doesn't help. All 100nF bypass caps are connected Point to point bellow the chip
The coils are outside the board also 😱 😀
Well, as I had a lot of care with the ground, and I placed all the bypass caps (althought p2p), it works perfect
What program did you use to make the board? Eagle doesn't open .lay files.
Best Regards !
http://www.abacom-online.de/uk/html/sprint-layout.html
i think you can find sprint layout 4.0 for free.
Also i can post gerber files. Second (top) layer used only for topground, all connections are made in bottom layer.
i think you can find sprint layout 4.0 for free.
Also i can post gerber files. Second (top) layer used only for topground, all connections are made in bottom layer.
-_nando-_ said:
Well, as I had a lot of care with the ground, and I placed all the bypass caps (althought p2p), it works perfect
Congratulations--you must have done a lot of things right to make the amp work.
The heat obviously isn't coming from core losses, so it has to be resistive losses in the coil. Sounds like you got the temperature down to something more reasonable, but my guess is the coil is fairly big.
I had the heat problem originally with the JWMiller 2100 series coil, but it went away completely with the 2200LL coil.
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