I shall be using one this week with my CW keyer to send slow CW (QRSS) on 1.2kHz and 8.97kHz. For very slow CW I'll need a much more stable oscillator probably a crystal and digital divider, although many on the "Dreamers Band" are using a DDS source.
2 comments:
Howdy,
I see the twin-t oscillator information on the G0XAN site is incomplete.
In the drawing of the twin-t oscillator embedded in your post, the following sets the frequency:
R1=R2=Rx
R3=Rx/K
C2=C3=Cx
C1=KCx
F=1/(2*PI*Rx*Cx)
K>2
See Here:
http://en.wikipedia.org/wiki/RC_oscillator
Here is a better (IMHO) albeit more complex circuit:
www.discovercircuits.com/Andy/Twin-Toscillator.pdf
73's David WB4ONA
Impressive with thanks!
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