[sdiy] Newbie question: Diode ladders

[Ian Fritz]

At 09:07 PM 9/14/05, harrybissell wrote:
>If you use ohms law... and the fact that the diode forward voltage
>is about .7V over a wide range of currents...
>
>Take .7V / the current = the equivalent resistance of the diode.
>
>Your signal levels have to be small enough that they don't move the
>current much by comparison.


Hmmm ... to be a bit picky ... the dynamic resistance is actually the 
tangent slope of the IV curve at the bias point. But for a rough 
approximation using the chord, as you suggest, isn't too terrible.

   Ian