DIY caps ?

Bernhard · 17th January 2004, 04:04 PM

Anybody ever built his own caps ?

Very interesting would be Teflon

Lars Clausen · 17th January 2004, 04:25 PM

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!

Variac · 17th January 2004, 04:34 PM

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.

Christer · 17th January 2004, 10:31 PM

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.

Tensop · 18th January 2004, 08:40 PM

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

gushogh · 18th January 2004, 09:56 PM

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

Bernhard · 19th January 2004, 08:42 AM

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 µF

Waiting for catalogue from teflon foil supplier.

The construction is inductive...

This could be an advantage for a non-os DAC output stage

wiligruen · 19th January 2004, 09:44 AM

You can find some info under http://www.jogis-roehrenbude.de/
Search "Leserprojekte-Herstellung eines Wickelkondensators".
Wilfried

17th January 2004, 04:04 PM	#1
Bernhard diyAudio Member Join Date: Apr 2002 Location: Munich	DIY caps ? Anybody ever built his own caps ? Very interesting would be Teflon

17th January 2004, 04:34 PM	#3
Variac diyAudio Editor Join Date: Dec 2001 Location: San Francisco, USA	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. __________________ Burning Amp Festival Sunday, October 28th, 2012 in S.F. We need Volunteers & sign-up's for what you're bringing!

19th January 2004, 08:42 AM	#7
Bernhard diyAudio Member Join Date: Apr 2002 Location: Munich	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 µF 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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17th January 2004, 04:25 PM	#2
Lars Clausen diyAudio Member Join Date: Oct 2003 Location: The Lab	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!

17th January 2004, 10:31 PM	#4
Christer diyAudio Member Join Date: Sep 2002 Location: Sweden	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.

18th January 2004, 09:56 PM	#6
gushogh diyAudio Member Join Date: Oct 2003 Location: Denmark	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

19th January 2004, 09:44 AM	#8
wiligruen diyAudio Member Join Date: Oct 2002 Location: Munich, Germany	You can find some info under http://www.jogis-roehrenbude.de/ Search "Leserprojekte-Herstellung eines Wickelkondensators". Wilfried

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