From: info@prodentesano.ch   
      
   Hi,   
      
   my problem ist the following:   
      
   With a foot contact I switch a tiny power mosfet (BS 170) on, which in turn   
   (softly) turns on a small 9V DC motor.  After a moment, my foot often gets   
   tired, and I would like some circuit to hold the gate of the mosfet positive   
   for me.   
      
   After a minute or two, I would like to be able to turn off my mosfet again   
   by a short touch to the pedal.   
      
   I was thinking of a combination of 555 timer(s) opening a time window where   
   I could take the foot off the pedal, and a sample an hold ic, but do not see   
   how to combine them, I am just an amateur...   
      
   Is there a genius out there who can help me to accomplish this?   
      
   Any input will be greatly appreciated, thank you in advance!   
      
   Ernesto   
      
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