[kreutz]

Hello to all,
after my partial success with this board i have smoked the
output , luck'ily the board is ok, now i'm back to reading the old posts.

could someone please tell me, how important is height of R37,R36,R29 &R23
above the board surface, mine are way below .15",could this be my trouble.?

regards mick.

ps
i'm now the proud owner of a scope,so maybe will be able to stop the smoke!,

Those resistors will heat-up under normal working conditions, so keeping them about 0.15" from the PCB surface will accomplish two things: avoid PCB over-heating and degradation with time, and avoid arching to the ground plane.

Other resistors that should be kept at least 0.15" from the PCB surface are: R24, R27, R31, R34 (22 ohm gate resistors) just to comply with creepage distances (the ones in bold are more important).

Kreutz.

[mick22]

Kreutz,
thanks for the reply.
mick.