[TriEmbed] MOSFETs or Relays

Rick nm3g at triad.rr.com
Thu Jun 26 15:13:21 CDT 2014


Good afternoon Brian,

Did you consider connecting the common terminal to the + supply 
terminal, and then connecting each direction terminal to it's own Mosfet 
Drain? Both Mosfet sources are then connected to - supply terminal, and 
your gate drives are referenced to the source (again - supply terminal)? 
I'm assuming a DC power source.

Regards,

Rick


On 6/26/2014 2:49 PM, Grawburg wrote:
> It now appears that MOSFETs are not going to work for my conveyor/railroad project.
> The single solenoid in the turnout controls straight and turn; a common ground and two 12VDC terminals.
> I can control one direction with the FET without any problem, but trying to set-up two FETS reduces
> the voltage to the solenoid enough that it will not operate. I suppose I could add other solid-state devices
> to overcome the issue, but I don't think it's worth it when two relays work so easily.
>
>
> Not a failure - a learning experience.  At least I know how to work with N-Channel MOSFETS.
>
>
> Brian
>




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