Exact match. Not showing close matches.
'[PIC]: PIC 16F84A Self-Destruction'
|> At 02:45 PM 10/8/01 +1000, Jonathan Luthje wrote:
> >G'day all,
> > I have a question relating to the 16F84A processor - basically all
> > I'm doing is switching on and off a couple of relays via a 1.6mA base
> > current to
> >a pair of BF246 NPN transistors. There are 3 pins (RB0,1,2) set to output
> > - the rest are set to input, some tied high, some tied low, all via 2k0
> > resistors, all unused pins are tied together, set to input and tied to
> > ground via a 2k0 resistor. I have regulated and filtered 6vdc supply
> > rails powering the thing.
I tried to look up BF246 but all I could find was a N-channel JFET of the
same name. I couldn't imagine that you were using a JFET to run relays with...
Anyway, have you tested the transistors for shorts when the problem happens?
Do you have diodes or snubbers across your relay coils?
currently: Stanwood, WA
http://www.piclist.com hint: The list server can filter out subtopics
(like ads or off topics) for you. See http://www.piclist.com/#topics
More... (looser matching)
- Last day of these posts
- In 2001
, 2002 only
- New search...