[sdiy] Using BC847S in exponential converter

[Dave Manley]

Samppa Tolvanen wrote:
> On Fri, Aug 21, 2009 at 11:42 AM, Gerard<translucent at xs4all.nl> wrote:
>> Lots of VCO designs are using outdated (well, hard to obtain) matched
>> transistor pairs like the LM394 and MAT02 in their exponential converter.
>> Has anyone on the list ever tried the BC847S that can be found real cheap
>> (I bought 100 of them for 5€ at Conrad) in such an application?
>>
>> The only reference on the list I could find was this post:
>> http://dropmix.xs4all.nl/pipermail/synth-diy/2008-August/008924.html
>>
>> I'll do some experiments anyway :)
>>
> 
> These aren't monolith designs, You get a couple of transistor from the
> modern process in the same package.
> 
> qamppa

Another option found looking at some of George Hearn's work:

http://www.diodes.com/products/catalog/list.php?parent-id=28

-Dave