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Old 17th January 2004, 04:04 PM   #1
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Default DIY caps ?

Anybody ever built his own caps ?

Very interesting would be Teflon
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Old 17th January 2004, 04:25 PM   #2
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You can buy TEFLON tape in any supermarket, it's the white tape used to stop waterpipes from dripping. So get to it....

Very interesting experiment!
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Old 17th January 2004, 04:34 PM   #3
Variac is offline Variac  United States
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I have read a thread here by someone that tried. They worked, but their values were quite low for their size. He got higher values by sqeezing them in a vice, so I guess it is important to wrap them tightly. Try searching on the subject.
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Old 17th January 2004, 10:31 PM   #4
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My father used to DIY foil caps long ago. They were hardly
high-performance, though, since I think he usually used
chocolate wrapping foil. I have no idea how he knew the
capacitance of them, and he probably didn't.
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Old 18th January 2004, 08:40 PM   #5
Tensop is offline Tensop  Lebanon
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Quote:
Originally posted by Christer
My father used to DIY foil caps long ago. They were hardly
high-performance, though, since I think he usually used
chocolate wrapping foil. I have no idea how he knew the
capacitance of them, and he probably didn't.


Pretty simple really, if he stayed in hospital for 1 hour after zapping himself on it it would be 100uF, 2 hours for 200uF and so on
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Old 18th January 2004, 09:56 PM   #6
gushogh is offline gushogh  Denmark
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Once as a high-school project I did a few DIY caps.

I made many different constructions; however I got the highest
capacitance by rolling tinfoil around a cylinder (radius = 2 cm or so) and
separating the layers with a thin plastic film.

By putting a square signal (supply) on the cap and then fitting the discharging curve (though a knowned resistor) to a e^(t) functions I could calculated the capacitance to 462nF

The measurement/calculations should be quite accurate.
The total length of the tinfoil was 2.2meters and width was 14,75cm
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Old 19th January 2004, 08:42 AM   #7
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Default first try

Adhesive aluminum-on-paper-foil with soft plastic base (that what will be removed before use)

size is 5x7 cm, dielectric paper/plastic and capacity 0.154 F

Waiting for catalogue from teflon foil supplier.

The construction is inductive...

This could be an advantage for a non-os DAC output stage
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Old 19th January 2004, 09:44 AM   #8
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You can find some info under http://www.jogis-roehrenbude.de/
Search "Leserprojekte-Herstellung eines Wickelkondensators".
Wilfried
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