From: footboarder@bresnan.net   
      
   Would a 'push on / push off' switch work?   
   ***************************   
   "Dr. Ernst Baumgartner"  wrote in message   
   news:49668e02$1_2@news.bluewin.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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