c4s voltage requirement

[vanofmonks]

I have misplaced my c4s kit document, so does anyone know what the minimum voltage drop across the c4s? 

Thanks

[Paul Birkeland]

I think you'd want at least 5V, but the voltage needed across the C4S depends a whole lot more on what you're doing with it. 

[vanofmonks]

Thanks.  That should be ok then.  It is in a low voltage setup of 40v with a vfet at 6ma.  The vfet + cathode bias should be about 19 to 20v which would leave 20v for the c4s voltage drop and the voltage swing.  if it is only 5v it should leave plenty.