[sdiy] non-mechanical switching solutions

[Ian Fritz]

My latest VCO design uses MOSFET switching.  After a bit of searching I 
settled on the VN0104. So please let me know if you find a better one!

Don't forget -- modern MOSFETS all have built-in body diodes, which 
means you have to use two back-to-back devices for bipolar signals.

Ian


On 6/27/2016 8:15 AM, Pete Hartman wrote:

>
> Third thought: MOSFETs have low on resistance....  And an initial test
> of VN0104's (on resistance on the order of 3R - 5R, much better) shows
> somewhat more promise.  A little concerned about on capacitance and also
> whether I can get an appropriate Vgs at the top stage of the ladder
> (where the source voltage will be on the order of 10V), but so far so
> good; may need a MOSFET with a lower range for Vgs-on, but the VN0104 is
> pretty darn good with a max of 2.4V.... that's just at the edge of the
> spec though, I think, something better would be nice.  Don't want to be
> in the position of having to "select" working transistors for the top stage.

-- 
ijfritz.byethost4.com