[sdiy] Aaron's updated datasheet and ap note archive

[Harry Bissell Jr]

Yes. You must have a really light load... but you can do it.
  My last project I got to under 200mV but my load is industrial
  and i have to sink some current from the load itself. I could
  use a lower value resistor, but that started to hurt me on the
  high side (the current source / sink not symmetrical).
  
  I was still proud... the unit I was driving said "0-10V" but
  it didn't go lower than 700mV
  
  Did everybody see the EDN design idea (might have been electonic
  design 'ideas for design' also) with the active current sink to being the
  LM324 down to ground. Gee... only a CA3046 and some other components.
  Doh... buy a real opamp. Well... OK if you were on Apollo 17, it might
  be a viable design
  
  H^) harry
  
  

Ian Fritz <ijfritz at earthlink.net> wrote:  At 07:51 PM 1/5/06, harrybissell wrote:

>I'd sat the LM324 'is' a single supply opamp (primarily and
>preferredly)...
>
>It does have input common mode range down to 'ground' (thank you PNP
>input
>stage)... and the output can come within 200mV to 700mV of ground...
>pretty damn close in most cases.

Harry, Jim, et al. --

I discovered a trick -- if the output has ~3k to ground, then it will come 
to within ~4mV of ground.  I used the LM324 for all the analog controller 
signals in my MIDI wind controller:
http://home.earthlink.net/~ijfritz/sos_circ.htm

   Ian 



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