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Old 11th July 2003, 11:55 PM   #1
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Default .005pf capacitor anyone?

I was browsing throught my schematic for my Eico HFT-90 tuner, in the process of creating a small bom, ran across .005mmf which I believe is a .005pF capacitor is it not? I look all over couldnt find such a beast. Anyone know where to find such an odd part?
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Old 12th July 2003, 12:03 AM   #2
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No, it's 5nF.
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Old 12th July 2003, 12:03 AM   #3
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Default Re: .005pf capacitor anyone?

Quote:
Originally posted by ajhawkins
... a .005pF capacitor is it not? ...where to find such an odd part?
You can make a 5 femtofarad capacitor by placing 2 wires within a foot of each other.

But really, it's probably actually 0.005 mF or 0.005 uF. You're not supposed to post the schematic because of the whole copyright thing, but perhaps you can show us a small section of it, so that we can figure it out...
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Old 12th July 2003, 12:48 AM   #4
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Default Schematic

I found it on the web so I dont think EICO will sue *knock on wood*

http://engr.uark.edu/~lar/hft90s.gif

its too large to upload with the 100k cap.
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Old 12th July 2003, 01:24 AM   #5
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"mmf" generally means micro-micro-farad, or yes indeed, picofarad. Must be a typo.
*I think* it's before the days of standardized Greek symbols for orders of magnitude (, etc.), in any case it doesn't mean "mili-mili-force" as today's symbols would say. )

.005 would generally refer to F, or 5nF, or 5,000pF.

<Schematic finally downloaded> Ah, that is weird... huh. Maybe they did mean "mili-mili" for some strange reason.
Nah that can't be, cuz they have "mfd" there as well...

Tim
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Old 12th July 2003, 04:08 AM   #6
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That's weird. As you say, mm usually meant micro-micro, but there's just no way you can make a 0.005mmF, or 5fF capacitor - 5pF tends to be +/- 0.5pF. On the other hand, three typos are odd too. Perhaps comparing the component's value with other circuits of that era will solve the problem...
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Old 12th July 2003, 05:28 AM   #7
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well these days mfd usually means millifarad ... that is to say 1/1000 farads but given that list, I dont believe I've ever seen a 10uF disc cap so maybe it is micro and micro-micro after all...
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Old 12th July 2003, 06:41 AM   #8
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possibly is it a typo? mmfd, mfd, i mean it is possible someone just got happy with the m key?
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Old 12th July 2003, 07:32 AM   #9
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Both links with schematics and pictures should reveal the answer.
http://home.earthlink.net/~eico_hf81/eico_hft90.htm
http://home.earthlink.net/~eico_hf81/links.htm

IMHO 0.005mmf is 5pF

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Old 12th July 2003, 05:43 PM   #10
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Default capacitance meter

anyone have plans for a capacitor meter down to 1pf Yeah I'm thinking I'll just leave them alone since I have no way of knowing for sure the value.................thanks for your input guys

ah
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