Question about capacitors
Andrew L., Tue Jul 10 2007, 11:57AMI'm about to buy some capacitors for a SSTC or DRSSTC and I'm not sure if the capacitors with the below specifications are fit for SSTC or DRSSTC use. What do you think?
High Voltage Polypropylene Film Capacitor
Type: PPS [CBB81]
Capacitance: 0.33uF
Rated voltage: 2000V
Capacitance tolerance: ±5%
Dimension: 25mm in width and 29mm in height
Re: Question about capacitors
Steve Conner, Tue Jul 10 2007, 12:16PM
You need to find out if they are polypropylene film/foil with extended foil construction. This is the only type of capacitor that works reliably.
Steve Conner, Tue Jul 10 2007, 12:16PM
You need to find out if they are polypropylene film/foil with extended foil construction. This is the only type of capacitor that works reliably.
Re: Question about capacitors
Andrew L., Thu Jul 12 2007, 09:59AM
The capacitors look like these so I don't think that they are suitable for TC use.
Andrew L., Thu Jul 12 2007, 09:59AM
The capacitors look like these so I don't think that they are suitable for TC use.
Re: Question about capacitors
Sulaiman, Thu Jul 12 2007, 05:44PM
A quick google for " pps cbb81" reveals that
they are foil/film polypropylene,
have a good dV/dt rating
and good dissipation factor.
So I'd guess they're good for TC use.
Sulaiman, Thu Jul 12 2007, 05:44PM
A quick google for " pps cbb81" reveals that
they are foil/film polypropylene,
have a good dV/dt rating
and good dissipation factor.
So I'd guess they're good for TC use.
Re: Question about capacitors
Andrew L., Fri Jul 13 2007, 07:37PM
Where do you guys buy caps for TC, SSTC and DRSSTC use?
eBay?
Andrew L., Fri Jul 13 2007, 07:37PM
Where do you guys buy caps for TC, SSTC and DRSSTC use?
eBay?
Re: Question about capacitors
dingo27, Fri Jul 13 2007, 08:26PM
Please guys, in a power supply for PC is some kind of that condensators -
that round blue and big "poppa" brown - plz tell me it is good enough and i finally found capacitors for 2K(ilo)V(olts), and plz. tell me if it is good capacity (and what hell is that capacity) to run some SGTC (verry little certainly)! You´ll make me very happy !!! THat big poppa is looking like those on the picture above
And this yellow square one - should it be applied for MMC ? it is rated to 280V(0,22uF), but dunno nothing more ...
[Edit: The Lord sayeth that thou shalt not exceed the 400 pixel limit on pictures]
dingo27, Fri Jul 13 2007, 08:26PM
Please guys, in a power supply for PC is some kind of that condensators -
that round blue and big "poppa" brown - plz tell me it is good enough and i finally found capacitors for 2K(ilo)V(olts), and plz. tell me if it is good capacity (and what hell is that capacity) to run some SGTC (verry little certainly)! You´ll make me very happy !!! THat big poppa is looking like those on the picture above
And this yellow square one - should it be applied for MMC ? it is rated to 280V(0,22uF), but dunno nothing more ...
[Edit: The Lord sayeth that thou shalt not exceed the 400 pixel limit on pictures]
Re: Question about capacitors
Ken M., Fri Jul 13 2007, 09:35PM
For tesla coil use I believe many would recommend 1kv+ so the big daddy brown one most likely will not work, the yellow one won't work either I've tried it died (internal flash over at low voltages but high peak surges (looked cool) but don't work) the Blue 2Kv cap...I'm not sure.
Ken M., Fri Jul 13 2007, 09:35PM
For tesla coil use I believe many would recommend 1kv+ so the big daddy brown one most likely will not work, the yellow one won't work either I've tried it died (internal flash over at low voltages but high peak surges (looked cool) but don't work) the Blue 2Kv cap...I'm not sure.
Re: Question about capacitors
GimpyJoe, Sun Jul 29 2007, 03:53PM
the blue one definetly won't work because it's a ceramic cap. It will have very little capacitance and will flash over or pop and fling little ceramic bits.
GimpyJoe, Sun Jul 29 2007, 03:53PM
the blue one definetly won't work because it's a ceramic cap. It will have very little capacitance and will flash over or pop and fling little ceramic bits.
Re: Question about capacitors
sparky, Mon Jul 30 2007, 02:22AM
too be perfectly honest with you, very few kinds of MMCs will take strong pulse discharges. The capacitors that survive this kind of abuse are double wound --
sparky, Mon Jul 30 2007, 02:22AM
too be perfectly honest with you, very few kinds of MMCs will take strong pulse discharges. The capacitors that survive this kind of abuse are double wound --
Re: Question about capacitors
Nik, Mon Jul 30 2007, 02:28AM
If the blue ones don't explode or flash over they melt (I've tried). It makes a mess.
Nik, Mon Jul 30 2007, 02:28AM
If the blue ones don't explode or flash over they melt (I've tried). It makes a mess.
Re: Question about capacitors
sparky, Mon Jul 30 2007, 03:50AM
CDE 942 capacitors are specially designed for massive current pulse discharge operation. I personally use the .68 uF 1600VDC rated CDE 942s... wow are they great!
sparky, Mon Jul 30 2007, 03:50AM
CDE 942 capacitors are specially designed for massive current pulse discharge operation. I personally use the .68 uF 1600VDC rated CDE 942s... wow are they great!
Re: Question about capacitors
GimpyJoe, Mon Jul 30 2007, 04:10PM
I've found those yellow GE caps everyone hates are actually fine, at least for SGTC's, as long as you have multiple strings. Single strings pop like popcorn though. My NST coil has yet to blow two parallel strings.
GimpyJoe, Mon Jul 30 2007, 04:10PM
I've found those yellow GE caps everyone hates are actually fine, at least for SGTC's, as long as you have multiple strings. Single strings pop like popcorn though. My NST coil has yet to blow two parallel strings.
Re: Question about capacitors
cbfull, Mon Jul 30 2007, 06:46PM
I just learned how to embed the image in my post so if I did something wrong tell me and I'll fix it ASAP!
cbfull, Mon Jul 30 2007, 06:46PM
Andrew L. wrote ...
The capacitors look like these so I don't think that they are suitable for TC use.
Don't be so sure. I have about a hundred or so PP caps just like that. The ratings are a bit different, 1000V @ 0.22uF, and I used a string of 45 or so of those for my SGTC for several years for long runs with no problems.The capacitors look like these so I don't think that they are suitable for TC use.
I just learned how to embed the image in my post so if I did something wrong tell me and I'll fix it ASAP!
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