[sdiy] 3046 vco help?

[Tim Parkhurst]

On Thu, Aug 18, 2011 at 9:34 AM, Dan Snazelle <subjectivity at hotmail.com> wrote:
> I have been messing around with the EFM 3046 vco
>
> http://www.modular.fonik.de/files/EFMforum/orgEFMfiles/3046_VCO.pdf
>

While (approximately) on the subject, there are some new parts that
might make this type of VCO a little easier to build. While I haven't
evaluated them, the BC847PN and MMDT3946 are NPN/PNP transistor pairs
that, while they're not being sold as "matched pairs," I would have to
think would have excellent thermal coupling. They're SMT, very
inexpensive and the MMDT looks to be a 3904 and a 3906 in a single
package. Also, both Mouser and Digi-Key carry the Panasonic 1K and
1.8k SMT tempcos.


Tim (time to get out the magnifier and the tweezers) Servo
-- 
"Sire, the church of God is an anvil that has worn out many hammers."
- H.L. Hastings