** For "sci.electronics.design" thread:

" JFET gain control "resistor" in Weinbridge oscillator "




...... Phil

Phil Allison wrote:

** For "sci.electronics.design" thread:

" JFET gain control "resistor" in Weinbridge oscillator "

An unspecified thermistor is hardly much help.

Graham

"Eeysore"

Phil Allison wrote:

** For "sci.electronics.design" thread:

" JFET gain control "resistor" in Weinbridge oscillator "

An unspecified thermistor is hardly much help.


** Read the thread this relates too & see that TH1 is not relevant.

FYI, it's an RA53.



...... Phil

Phil Allison wrote:

"Eeysore"
Phil Allison wrote:

** For "sci.electronics.design" thread:

" JFET gain control "resistor" in Weinbridge oscillator "

An unspecified thermistor is hardly much help.

** Read the thread this relates too & see that TH1 is not relevant.

Yes, I read the full post in s.e.d later. Understood.


FYI, it's an RA53.

Can you even still get them ?

Graham

On Sun, 7 Sep 2008 14:15:34 +1000, "Phil Allison"
wrote:



** For "sci.electronics.design" thread:

" JFET gain control "resistor" in Weinbridge oscillator "




..... Phil


The opposite extreme just a sine table, in an eprom maybe, feeding a
16-bit DAC. Clock that from an an analog oscillator or a DDS. That can
get down to a couple of 10's of PPM distortion. For purists, you can
move the sine lookup into ram and tweak the values to tune out
successive harmonics, and get down to low PPM distortion.

Tricks, like sweeps or quadrature outputs, are easy once you go
digital.

Hmmm, that's starting to be a sound card.


John