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MPaulHolmes · 06-11-2009, 07:18 PM

EDIT: Hey, the awesome engineer has been checking the thread, and has responded! Just for future reference, I'm pretty much actually a moron that doesn't really what I'm talking about. hehe.

The .1uf caps around the HIN202 are all ceramics and therefore nonpolarized. This was the default shape Protel had for nonpolarized (note no + sign) and I wasn't concerned about the curved side of symbol. Personally, I like both sides of the shape straight for nonpolarized.
Optoisolator U9 is necessary. +12VB is on the "dirty" side of common mode filter L1 and I need to keep it isolated. Both the +12VB and +5V also reference difference grounds, also separated by the common mode filter, but the +12VB ground is also a diode drop lower thanks to D1. A 20 cent opto handles the level shifting and isolation. We'd require an NPN transistor anyway to turn the FET on.

Ya! hehe. I got good peeps!

06-11-2009, 07:18 PM	#1674 (permalink)
MPaulHolmes PaulH Join Date: Feb 2008 Location: Maricopa, AZ (sort of. Actually outside of town) Posts: 3,832 Michael's Electric Beetle - '71 Volkswagen Superbeetle 500000 Thanks: 1,362 Thanked 1,202 Times in 765 Posts	EDIT: Hey, the awesome engineer has been checking the thread, and has responded! Just for future reference, I'm pretty much actually a moron that doesn't really what I'm talking about. hehe. The .1uf caps around the HIN202 are all ceramics and therefore nonpolarized. This was the default shape Protel had for nonpolarized (note no + sign) and I wasn't concerned about the curved side of symbol. Personally, I like both sides of the shape straight for nonpolarized. Optoisolator U9 is necessary. +12VB is on the "dirty" side of common mode filter L1 and I need to keep it isolated. Both the +12VB and +5V also reference difference grounds, also separated by the common mode filter, but the +12VB ground is also a diode drop lower thanks to D1. A 20 cent opto handles the level shifting and isolation. We'd require an NPN transistor anyway to turn the FET on. Ya! hehe. I got good peeps! __________________ kits and boards Last edited by MPaulHolmes; 06-11-2009 at 10:57 PM..