To get a few panel bearings you can use the threaded collars from old
potentiometers.  I have a supply of them I have salvaged from old
military gear.  I would think any supplier of small fittings would have
them but the first few I looked at came up dry.

Sherpa Doug

> -----Original Message-----
> From: Mike Kendall [mailto:ke6cvh@THE-I.NET]
> Sent: Thursday, August 09, 2001 10:25 AM
> To: PICLIST@MITVMA.MIT.EDU
> Subject: Re: varactors vs. air variable caps and LED windows
>
>
> Doug,
>     Thanks for the reply.  Where might I get the panel
> bearings at?? There
> is a local family  owned hardware store (Lonestar Hardware,
> after all I'm in
> TX) that I was already planning on bringing one down to to
> try just that.
> Was figuring they'd be metric.  All Electronics has the male to female
> circuit board standoffs for 100ea at 8 clams ($).  These
> units have what
> looked like mica but  probably plastic like you said spacers
> between the
> plates, I'll just use super glue from the dollar general
> store for the same
> affect.  I've experienced  the affects of nail polish on RF
> tuned circuits
> before when setting something after an adjustment. Missed out
> on a buy it
> now on Ebay for 800 pieces of these caps  for $100 as I
> wasn't so sure if
> this would all work out.
> ----- Original Message -----
> From: "Douglas Butler" <dbutler@IMETRIX.COM>
> To: <PICLIST@MITVMA.MIT.EDU>
> Sent: Thursday, August 09, 2001 6:49 PM
> Subject: Re: varactors vs. air variable caps and LED windows
>
>
> > About knobs for the air variables:
> > I have used 1/4" diameter spacers that have 2-56 threaded studs with
> > that type of capacitor.  Just screw the spacer into the cap with a
> > little locktite and use a regular 1/4" shaft knob.  Beware
> that excess
> > locktite may attack the plastic of the capacitor body.
> Also I usually
> > use a panel bearing for the shaft to reduce stress on the capacitor
> > body.
> >
> > Sherpa Doug
> >
> > > -----Original Message-----
> > > From: Mike Kendall [mailto:ke6cvh@THE-I.NET]
> > > Sent: Thursday, August 09, 2001 9:45 AM
> > > To: PICLIST@MITVMA.MIT.EDU
> > > Subject: EE: varactors vs. air variable caps and LED windows
> > >
> > >
> > > 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.
> > > Regards,
> > > Mike
> > >
> > > --
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> > >
> > >
> > >
> >
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> >
> >
>
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