From: radim100@yahoo.com   
      
   Hi,   
     I have following problem . The Thermopile probe ( 0.5V output @ 600 Deg C   
   with internal resistance 2 Ohms ) drives gas valve solenoid with very low   
   resistance ( approx. 0.023Ohm ) . Approximate holding current is 250mA .   
   So there is only about 5mV on solenoid . I need to cut off this circuit   
   with some kind of FEt , MOSFET or opto MOSFET . External circut to control   
   this switch can have common ground with above circuit. Cannot use relay -   
   external circuit does not have enought current to  drive relay. I see   
   problem with relativly low switched voltage ( only 0.5V ) and low   
   resistance of fet needed .   
     Any ideas what could be good solution ?   
   Thanks Radim.   
      
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