Fw: [sdiy] I have found that SSM2210 transistor arrays give better performance in my latest oscillator design.

[René Schmitz]

Hi Scott and all,

scottnoanh at peoplepc.com wrote:
> "Using  Rossum  compensation, the VCO tracks really well until one gets to
> between 60 to 15360 Hz, but it goes goes quite sharp from 60 to 30 Hz:  29
> cents =-(.  Tuning that out leaves the oscillator going sharp starting at
> around 960 Hz or so."
> 
> Confusing sentence, sorry, long day.  Meant to say:
> 
> Using  Rossum  compensation, the VCO tracks really well  between 60 to 15360
> Hz, but it goes goes quite sharp from 60 to 30 Hz:  29 cents.  Tuning that
> out leaves the oscillator going sharp starting at around 960 Hz or so.
> 
> Anybody had to trim high end sharpness out of a VCO?  Or is there a way to
> compensate for the low end (the 30 to 60 Hz).

Maybe this could also be caused by leakage.
I had to fight something similar on the experimental thyratron VCO, 
where I used a triode as sink element, with its grid leakage current. 
The cure there was to inject another current. The schemos are at my 
page. (I later simply switched to mosfets as sink, getting rid of the 
leakage...)

Cheers,
  René


-- 
uzs159 at uni-bonn.de
http://www.uni-bonn.de/~uzs159