varactors vs. air variable caps and LED windows
Mike Kendall email (remove spam text)
Have a project I've been working on for months now.
1st question- What is a good source for the plastic used for LED windows
for the red 7 segment LED's?
2nd question- Polling for input on Varactors vs air variable capacitors.
I recently purchased 16 RF tuner capacitors at $1.25ea from Electronix
Express only to find that there is no such thing as a mating knob for them
in the USA (they have two flat sides on the tuning shaft and a threaded hole
in the center of that. Also, the shaft is extremely short). I've
considered using a varactor tuned oscillator circuit with the 120pF variety.
Saw a web page that uses two varactors chained together with the tuning
voltage at the tie point. The circuit web page mentioned the low Q of
varactors and I'm concerned about this affecting my circuit negatively.
I'm aware of homebrew amateur 2meter transcievers using varactors and their
usage in radio receiver tuners.
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See also: www.piclist.com/techref/displays.htm?key=led
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