[sdiy] Analog Divider ideas ????

[René Schmitz]

Hi Harry,

I'd use a chain forming the equation (exp(-log (x)). I think this is how 
the RC4200 works anyway, just that the inversion isn't done. The usual 
woes with exponentiation and scale factors are no problem here as the 
expo and log terms should perfectly cancel out, if you use all four 
transistors on the same chip. (Say CA3046 or MAT04, I think there are 
suitable circuits in the Appnotes for these.)

Also there was a circuit posted here some years ago that did use a 
CA3046. I posted it to: http://www.uni-bonn.de/~uzs159/1_x.gif

Cheers,
  René

harrybissell wrote:
> Imagine how pissed off I was to JUST get an analog divider going using
> the
> RC4200... only to find out it JUST became unavailable (well... I can't
> find
> anyone who is stocking them anymore... Mouser just discontinued them)
> 
> Any suggestions ?   I need a one quadrant divider to do a 1/X function.
> 
> (I refuse to design in obsolete components unless I'm holding a good
> quantity...)
> 
> H^) harry
> 
> 


-- 
uzs159 at uni-bonn.de
http://www.uni-bonn.de/~uzs159