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Jesito
Joined: 24 Aug 2007
Posts: 5745
Location: Olivella, Catalonia, (Spain)
Expire: 2015-01-07
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 Posted: Tue Jan 06, 2009 4:12 pm Post subject: Capacitor discharger |
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Jesito wrote:
When trying to fix a flashgun unit, I got a nice electrical shock because the capacitor was fully charged. Since those current/voltages can be harmful for the human being, I'm building a small capacitor discharger.
Here you have the circuit:
R1 has to be of 10 to 20 watt dissipation.
Kind regards.
Jes.
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Farside
Joined: 01 Sep 2007
Posts: 6557
Location: Ireland
Expire: 2013-12-27
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| Posted: Tue Jan 06, 2009 6:41 pm Post subject: |
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Farside wrote:
I recall the old workshop trick of tossing charged capacitors to the new boys. 
Why not just a 1Megohm resistor?
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Attila
Joined: 24 Feb 2007
Posts: 57865
Location: Hungary
Expire: 2025-11-18
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| Posted: Tue Jan 06, 2009 7:12 pm Post subject: |
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Attila wrote:
| Farside wrote: |
I recall the old workshop trick of tossing charged capacitors to the new boys.
Why not just a 1Megohm resistor? |
 Cheap, effective isn't it ?
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Sevo
Joined: 22 Aug 2008
Posts: 1189
Location: Frankfurt, Germany
Expire: 2012-12-03
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| Posted: Tue Jan 06, 2009 7:20 pm Post subject: |
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Sevo wrote:
| Farside wrote: |
Why not just a 1Megohm resistor? |
Indeed. I've always used whatever > 200kOhm resistor was at hand. |
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Jesito
Joined: 24 Aug 2007
Posts: 5745
Location: Olivella, Catalonia, (Spain)
Expire: 2015-01-07
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| Posted: Tue Jan 06, 2009 7:25 pm Post subject: |
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Jesito wrote:
Just to have some feedback on the discharge status. The 4 diodes in series get 2,8 Volt across that feed the leds.
Two lines to don't mind on polarity.
The LEDs will light during the discharge, once the capacitor is empty, they get dark again.
Jes.
_________________
Jesito, Moderator
Jesito's backsack:
Zooms Sigma 70-300, Tamron 35-135 and 70-210 short, 70-210 long, 28-70 CF Macro, 35-70, 35-80, Vivitar 70-210 KA, Tamron 70-250.
Fixed Industar-50, , Tamron 24mm, Tamron 135mm, Sands Hunter 135mm, Pancolar 50mm, Volna-3, many Exakta lenses
DSLR SIGMA SD9 & SD14, EOS 5D, Sony A700 and NEXF3, Oly E-330, E-400, E-450, E-1
TLR/6x6/645 YashicaMat, Petri 6x45, Nettar, Franka Solida, Brilliant
SLR Minolta X300, Fuji STX II, Praktica VLC3, Pentax P30t, EXA500, EXA 1A, Spotmatic(2), Chinon CM-4S, Ricoh, Contax, Konica TC-X , Minolta 5000, 7000i, 3Sxi, EOS 500 and CX
Rangefinders Chinon 35EE, Konica C35 auto, Canonet 28, Yashica Lynx, FED-2, Yashica electro 35, Argus C3 & C4, Regula Cita III, Voigtlander Vitoret (many), Welta Welti-I, Kodak Signette 35, Zorki-4, Bessa-R & L, Minolta Weathermatic, olympus XA2
Compact Film Konica C35V, Voigtlander Vitorets, Canon Prima Super 105, Olympus XA2 and XA3
Compact Digital Olympus C-5050, Aiptek Slim 3000, Canon Powershot A540, Nikon 5200, SIGMA DP1s, Polaroid X530, IXUS55, Kodak 6490, Powershot G9 and G10
CSCCanon EOS-M, Samsung NX100 and NX210, Lumix G5, NEX-F3 |
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