[sdiy] RE: cem3396 and Log->lin convertor

[Scott Gravenhorst]

harrybissell <harrybissell at prodigy.net> wrote:
>Scott Gravenhorst wrote:
>
>> Usually, the expo converter does this,
>> but it converts a voltage to a current.  Is this as easy as pushing the
>> current through a fixed resistor and taking the voltage from the two
>> ends of the resistor?
>
>Yes... but you might want to read the voltage across the resistor with a
>differential
>amp to ground reference it...

Ah, that's what I thought.  So you're saying that the typical expo
converter doesn't source to ground, rather to the negative supply or
something ?

Are there no expo circuits that expect to source or sink current to
ground?  That would make it a bit simpler.

Corrupted by the FatMan...  No expo experience !

=========================================================  
- Where merit is not rewarded, excellence fades.
- Hydrogen is pointless without solar.
- What good are laws that only lawyers understand?
- The media's credibility should always be questioned.
- The only good terrorist is a dead terrorist.
- Governments do nothing well, save collect taxes.

-- Scott Gravenhorst | LegoManiac / Lego Trains / RIS 1.5
-- Linux Rex         | RedWebMail by RedStarWare
-- FatMan: home1.gte.net/res0658s/FatMan/
-- NonFatMan: home1.gte.net/res0658s/electronics/
-- Autodidactic Master of Arcane and Hidden Knowledge.