gimmick

But one never knows whether it's really a girl :-)

Got some ribbon cable?

Best regards, Spehro Pefhany

I think someone even blew her off the rock once and she had to be repaired and cemented back on. I'll never understand how people can be so stupid and destroy art just for "fun".

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yep she was found in the water with a few holes

The first time she lost her head it was allegedly a famous artist who did as an artist/political happening, though it hasn't been proven

second time a photographer made a bit of money off the pictures of her headless but it was never proven that it was him who did it

though I'm sure some would say the worst that has been done to her was that she was shipped to the Danish pavilion in Shanghai for Expo 2010

-Lasse

Small diode like BAV99 used as varicap?

Vladimir Vassilevsky DSP and Mixed Signal Designs

Well, that's a problem. I like small, slim women and, from behind, sometimes you can't tell if she's interesting, or if she's a guy.

It's like hair. You can cut it shorter but you can't cut it longer.

That's where the fudge margin comes in. Snip off at a steep angle instead of perpendicular, 60-70 degrees or so. Then when you just blew past the optimum you can do a "comb-over" with the slightly longer wire. Another trick is not to twist tightly, at least not the first couple of turns. That way you can tighten it up some more and the capacitance goes up again.

That's my hometown. Right on the seawall walk at Stanley Park. The thing that looks like an amusement park ride in the background is a loading conveyor for yellow sulphur.

Cheers

Phil Hobbs

Nah, the one in Vancouver doesn't need the parka because she's on the Canadian Riviera.

Cheers

Phil Hobbs

But then (like me) you're long married, so it isn't such an issue.

Cheers

Phil Hobbs

(Married 30 years last month)

No, but when you get close you can slide the insulation back and forth on the wires. PVC has a dielectric constant of about 3.

Best regards, Spehro Pefhany

A varicap would work; the signal swing will be small. There's a great Skyworks diode kit full of diodes... varicaps, schottkies, pins, like that.

Well, I'm long married, about the same, but that doesn't stop women from looking good. Hormones and all that. They won't miss a few photons bounced off their envelopes.

I have some old pots that have the capacitor built in. I'll let you have them cheap. :)

Le Fri, 20 Sep 2013 16:05:35 -0700, John Larkin a écrit:

The usual trick for this would be a T capacitor bridge. Put your high capacitnce gimmick either in the output or ground branch and keep a

Le Sat, 21 Sep 2013 06:31:41 +0000, Fred Bartoli a écrit:

....

Well, read all the thread correctly... Obviously it should be more than

I used to build adjustable low value capacitors using two parallel lengths of Teflon insulated wire and some clear shrink tube. The wires were arranged in an axial arrangement (like a resistor), not radial, like a gimmick. Just slide the wires in and out of the shrink tube to adjust the capacitance. The wires had to be Teflon insulated because the insulation had to be slippery enough to slide freely. Once trimmed, I used hot melt glue to secure the assembly.

C = 1 / 3.6 ln[(d-r)/r] where: c = pf/cm r = wire radius cm d = distance between wire centers cm

For #24 AWG solid PTFE insulated wire wire diameter = 0.0511 cm OD = 0.145 cm

d = 0.145 - 0.0511 = c = 1 / 3.6 ln[(0.0939-0.0256)/0.0256] c = 0.284 pf/cm However, that's for air dielectric. For PTFE at c= 2.5, it would be: c = 0.284 * 2.5 = 0.071 pf/mm

So, you need an overlap between 2.8 mm to 11.3 mm for 0.2 to 0.8 pF.

Interesting... Can you give some guidance on: How do you maintain mechanical stability with 2.8 mm overlap of two 1.45mm wires == ~8mm of extra wire when you stick it on the shake table? Dielectric effects of hot melt? Series inductance as a function of capacitance compared to a classical radial gimmick?