DCS Integrator Capacitors

[harrison at ll.mit.edu]

Roger,
    About 20 years ago, I reached the same conclusion with integrating 
capacitors.  Glass dielectrics then were fairly bad.  I have an old (1979?) data 
sheet from Custom Electronics in Oneonta, NY which lists a 500 pF, 50 V teflon 
film capacitor in a lower grade dielectric material.  They also listed 250 pF in 
the higher grade dielectric.  According to the 1996 EEM, Custom Electronics is 
still in business at (607) 432-3880, same as the 1979 number.  None of the other 
active vendors for whem I have data make smaller capacitors than 1 nF.
    I ended up using Components Research teflon caps, finding them to be the 
best performers for space applications.  Polystyrene (not polyester, or Mylar) 
looked like a good performer when I needed them, but they were physically very 
large, too difficult to package for flight.
    Good luck.  

        Dave Harrison  MIT Lincoln Lab