u.r.a - variable capacitor
 

This is (almost) the build so far. I've now added an anti-rotation cam to
the front, restricting the travel to 180 deg. and a rotor connection to the
back.

--
Mick (Working in a M$-free zone!)
Web: http://www.nascom.info http://mixpix.batcave.net
Filtering everything posted from googlegroups to kill spam.

u.r.a - variable capacitor
 

mick wrote:
This is (almost) the build so far. I've now added an anti-rotation cam to
the front, restricting the travel to 180 deg. and a rotor connection to the
back.

How did you cut all the plates out to be so similar?

I think I would either jumper connect those two top bolts to
the bottom ones (rather than leave them floating), or
replace them with nylon all thread covered by a length of
rigid plastic tube to act as a spacer.

--
Regards,

John Popelish

u.r.a - variable capacitor
 

On Sat, 05 Jul 2008 12:46:34 -0400, John Popelish wrote:

mick wrote:
This is (almost) the build so far. I've now added an anti-rotation cam
to the front, restricting the travel to 180 deg. and a rotor connection
to the back.

How did you cut all the plates out to be so similar?



Got them laser cut. I provided the company with a dxf file of the parts
that I wanted.


I think I would either jumper connect those two top bolts to the bottom
ones (rather than leave them floating), or replace them with nylon all
thread covered by a length of rigid plastic tube to act as a spacer.


My original intention was to just heatshrink the top bars and, possibly,
link them to the rotor.

--
Mick (Working in a M$-free zone!)
Web: http://www.nascom.info http://mixpix.batcave.net
Filtering everything posted from googlegroups to kill spam.

u.r.a - variable capacitor
 

On Sat, 05 Jul 2008 19:50:28 GMT, mick
wrote:

On Sat, 05 Jul 2008 12:46:34 -0400, John Popelish wrote:

mick wrote:
This is (almost) the build so far. I've now added an anti-rotation cam
to the front, restricting the travel to 180 deg. and a rotor connection
to the back.

How did you cut all the plates out to be so similar?



Got them laser cut. I provided the company with a dxf file of the parts
that I wanted.


I think I would either jumper connect those two top bolts to the bottom
ones (rather than leave them floating), or replace them with nylon all
thread covered by a length of rigid plastic tube to act as a spacer.


My original intention was to just heatshrink the top bars and, possibly,
link them to the rotor.

Grounding and stray body effects will depend on which set of plates is
grounded. Normally you'd do that to the most mechanically complicated
section - the rotor. The stator, being fixed, is easier to isolate.

RL

u.r.a - dual gang variable capacitor
 

legg wrote:

snip

Grounding and stray body effects will depend on which set of plates is
grounded. Normally you'd do that to the most mechanically complicated
section - the rotor. The stator, being fixed, is easier to isolate.



This circuit (using the single gang unit) has neither side earthed - which
helps keep things interesting. :-)

Here is the first temporary build-up of the dual-gang unit. Just done this
to see if all the spacings work out and so find out the best way of
assembling it. At least this one gets the rotor earthed!

--
Mick (Working in a M$-free zone!)
Web: http://www.nascom.info http://mixpix.batcave.net
Filtering everything posted from googlegroups to kill spam.