On May 26, 2006, at 7:15 AM, Sergey Dryga wrote:
>
> Darren,
> I would use a MOSFET to drive a solenoid, bipolar transistors  
> require to much
> current to drive them.  There is a lot of logic MOSFETs that will  
> do the job,
> e.g. NTE2980

I'll try a MOSFET and see what happens.  I'm really curious though to  
understand why I'm getting this locking on behavior.  From what I've  
read so far about transistors it doesn't make sense.  The circuit  
couldn't be simpler AFAICT.

thanks,

darren
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