| Do I suck ? |
| Absolutely |
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61% |
[ 13 ] |
| I've had better |
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19% |
[ 4 ] |
| Keep trying ! |
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19% |
[ 4 ] |
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| Total Votes : 21 |
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Motobias
Joined: 08 Jul 2008
Posts: 163
Location: Osnabrueck, Germany
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| Posted: Tue Nov 27, 2012 9:51 pm Post subject: |
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i think you are mixing something up with calculations for resistor networks !
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Nashou66
Joined: 12 Jan 2007
Posts: 16171
Location: West Seneca NY
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Motobias
Joined: 08 Jul 2008
Posts: 163
Location: Osnabrueck, Germany
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| Posted: Tue Nov 27, 2012 10:27 pm Post subject: |
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you can put them in series and it will increase the total max voltage, but the total capacity equals the capacity of a single one !
but putting capacitors in series is never a good thing...unless you have very specific (weird) needs.
and how did chris use 5 100v caps to get 600v rating ?
maybe the capacity gets reduced, because of the negative sideeffects of putting them in series (esr?!)
switching to tanatlums is mainly done to maintain a low esr, low leakage and long lifetime, so putting them in series... pointless in my eyes !
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Nashou66
Joined: 12 Jan 2007
Posts: 16171
Location: West Seneca NY
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| Posted: Tue Nov 27, 2012 10:48 pm Post subject: |
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| Motobias wrote: | you can put them in series and it will increase the total max voltage, but the total capacity equals the capacity of a single one !
but putting capacitors in series is never a good thing...unless you have very specific (weird) needs.
and how did chris use 5 100v caps to get 600v rating ?
maybe the capacity gets reduced, because of the negative sideeffects of putting them in series (esr?!)
switching to tanatlums is mainly done to maintain a low esr, low leakage and long lifetime, so putting them in series... pointless in my eyes ! |
Opps I meant 120VOLTS, 120UF.
Here is some formulas for capacitance
http://www.engineeringtoolbox.com/capacitors-parallel-series-d_1388.html
in parallel
C = (10 μF) + (20 μF)
= 30 (μF)
in series
1/C = 1/(10 μF) + 1/(20 μF)
= 0.15 (1/μF)
or
C = 1 / 0.15 (1/μF)
= 6.7 (μF)
So capacitance gets reduced in series according to this.
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Curt Palme
CRT Tech
Joined: 08 Mar 2006
Posts: 24396
Location: Langley, BC
TV/Projector: All of them!
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| Posted: Tue Nov 27, 2012 10:52 pm Post subject: |
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Correct. 2 of the same value caps in parallel stay at the same voltage rating, but double in capacitance. 2 of the same caps in series halve in value, but double in voltage.
It's not really a good practice to series capacitors. Nothing wrong with paralleling them.
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Tue Nov 27, 2012 10:58 pm Post subject: |
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Man, you guys are all over the place....... 
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Nashou66
Joined: 12 Jan 2007
Posts: 16171
Location: West Seneca NY
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barclay66
Joined: 27 Jun 2011
Posts: 1304
Location: Germany
TV/Projector: Marquee 9500 Ultra
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| Posted: Wed Nov 28, 2012 8:47 am Post subject: |
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| Nashou66 wrote: | | I read some where that if you do need to use caps in series that you have to make a safe resistor network or something like that with the caps. |
Hi,
I think this article refers to what You were thinking of: http://www.coilgun.info/theorycapacitors/capacitors2.htm
Scroll down to the section: Resistor Network for Series Capacitors
Regards,
barclay66
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Motobias
Joined: 08 Jul 2008
Posts: 163
Location: Osnabrueck, Germany
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| Posted: Wed Nov 28, 2012 9:10 am Post subject: |
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now we are all a bit smarter 
back to topic...
do the glycol chambers need to be full to the maximum with only a tiny air bubble or can i leave a bit more air,
just in case that the glycol wants to absorb a bit more water...
i am alright with bleeding the tubes every second year 
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Phoenixed
Joined: 13 Oct 2011
Posts: 514
Location: The mitten
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stridsvognen
Guest
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| Posted: Wed Nov 28, 2012 7:55 pm Post subject: |
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Hey.. we are waiting for some amazing screen shots now.. How long can it take to get a 9500LC performing its best.. 
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Motobias
Joined: 08 Jul 2008
Posts: 163
Location: Osnabrueck, Germany
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| Posted: Wed Nov 28, 2012 8:11 pm Post subject: |
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i took some, just dektop and closeup
it was all just a test setup and when doing screenshots, i wanna do it properly !
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Motobias
Joined: 08 Jul 2008
Posts: 163
Location: Osnabrueck, Germany
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| Posted: Wed Nov 28, 2012 10:51 pm Post subject: |
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i was looking up crt projector videos on youtube and stumbled across this one:
http://www.youtube.com/watch?v=P7Eu4RHnle8
what do you guys think ?
is it worth a try, improving signals and signal paths with ferrite cores...?
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Nashou66
Joined: 12 Jan 2007
Posts: 16171
Location: West Seneca NY
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AnalogRocks
Forum Moderator
Joined: 08 Mar 2006
Posts: 26706
Location: Toronto, Ontario, Canada
TV/Projector: Sony 1252Q, AMPRO 4000G
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| Posted: Thu Nov 29, 2012 8:22 am Post subject: |
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| Nashou66 wrote: | | Motobias wrote: | i was looking up crt projector videos on youtube and stumbled across this one:
http://www.youtube.com/watch?v=P7Eu4RHnle8
what do you guys think ?
is it worth a try, improving signals and signal paths with ferrite cores...? |
That's my Video. Youd have to check the noise with a scope first. In My case it worked greatly.
All the board mods done to your Stig amp board might have got the noise the hard expensive way.
Athanasios |
You have a funny accent
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Motobias
Joined: 08 Jul 2008
Posts: 163
Location: Osnabrueck, Germany
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| Posted: Thu Nov 29, 2012 10:29 am Post subject: |
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ok i'll get the scope out !
what else can i probe for noise ?
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Most peope talk about HD without knowing the meaning and how to do it RIGHT !
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Nashou66
Joined: 12 Jan 2007
Posts: 16171
Location: West Seneca NY
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| Posted: Thu Nov 29, 2012 1:04 pm Post subject: |
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| Motobias wrote: | ok i'll get the scope out !
what else can i probe for noise ? |
You can put the probe on the top leg of the big large resistor on the VNB to see the video signal. Put up a stair step pattern
from a Blu ray or the internals and you'll see the stair step. Its a good way to check how well you set up greyscale as well.
Athanasios
_________________
Don't blame your underwear for your crooked ass~ unknown Greek philosopher
"Republicans believe every day is the Fourth of July, but the Democrats believe every day is April 15." --- President Reagan
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Motobias
Joined: 08 Jul 2008
Posts: 163
Location: Osnabrueck, Germany
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| Posted: Thu Nov 29, 2012 7:17 pm Post subject: |
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i don't have a br player...nor a test br !
do i get about the same with the internal test pattern ?
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Phoenixed
Joined: 13 Oct 2011
Posts: 514
Location: The mitten
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| Posted: Thu Nov 29, 2012 7:48 pm Post subject: |
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You could try the avs calibration disc.
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Nashou66
Joined: 12 Jan 2007
Posts: 16171
Location: West Seneca NY
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| Posted: Thu Nov 29, 2012 8:45 pm Post subject: |
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| Motobias wrote: | i don't have a br player...nor a test br !
do i get about the same with the internal test pattern ? |
Not really as the Internal patters go through mostly a different
video path.
But for doing the greyscale with internal stair step pattern then yes. But not for finding noise.
After you scope the pattern you'll know why its called the stair step pattern
Athanasios
_________________
Don't blame your underwear for your crooked ass~ unknown Greek philosopher
"Republicans believe every day is the Fourth of July, but the Democrats believe every day is April 15." --- President Reagan
One Smart Dog!!!
Marquee High Performance Bellows now shipping!!
Marquee Modifications and Performance Enhancement
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