[sdiy] single supply expo?

[HOSHUYAMA]

Hello Dan,

The design by PCM1723 (a Japanese Synth DIYer) and my variations 
may be what you are looking for.

Single Supply Exponential Converters (Anti-Log):
   http://houshu.at.webry.info/200907/article_1.html

The links in my blog lead you to The PCM1723's articles.

Sam HOSHUYAMA
Saitama, JAPAN

Dan Snazelle wrote:
> 
> 
> I am trying to find or figure out how to make, a Single supply NPN pair expo converter
> 
> I am trying to make something that can run off of a 9v battery
> 
> 
> all the expos I know of connect somehwhere to -v.
> 
> i was wondering if I could make an expo that never connected to -v OR just had a +/VB/and grnd setup for dual supply
> 
> 
> this does NOT need to be super precise (its not for a vco)
> 
> thanks for any help!!
> 
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