Hi Sidney

To my experience the 2N3904 can be used as replacement for the BC547C.

The 2N3904 has to placed the other way around (flat side of the 2N3904
should point in the direction where the round side of the BC547C is
looking at).
See
http://www.datasheetcatalog.org/datasheet/SGSThomsonMicroelectronics/mXytvtz.pdf
http://www.datasheetcatalog.org/datasheet/SGSThomsonMicroelectronics/mXytvut.pdf

Pinout of the BC547C is Collector-Base-Emitter
Pinout of the 2N3904 is Emitter-Base-Collector


Florian

Sidney schrieb:

> I will try to find the transistor here in Brasil and see if that solves the gate output problem. If I won't find I will send to the dealer.