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Rusty
Joined: 06 Nov 2008
Posts: 435
Location: Mosselbay, South Africa
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 Posted: Fri Nov 14, 2008 9:18 pm Post subject: Fixing Yashika TL electro batt problem |
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Rusty wrote:
This is another easy fix to solve the batt problem on the tl electro (the one that uses two 1.28v mercury oxide cells
The cells are not made anymore and the only replacement available is zinc/air cells at 1.28v or normal alkaline
or silver oxide which has a higher volage (1.5v) and may lead to damage of the metering circuit or incorrect metering
In my battery mod i use a normal diode to drop the voltage down close to the level of the original mercury oxide cells
Turn down a stock piece of pastic to a diam of 16mm
Drill a 4mm hole straight through the centre
then drill a 12mm hole 12mm deep and square of the dril taper on the inside
then part the piece to a lenght of 24 mm
fit a diode through the 4mm hole as indicated in diagram
fit normal 1.5v cells as indicated in diagram
close up and shoot! 
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estudleon
Joined: 15 May 2008
Posts: 3754
Location: Argentina
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| Posted: Fri Nov 14, 2008 9:21 pm Post subject: |
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estudleon wrote:
WoW!!!
Clear, instructive. Nice to repair and play.
Thanks. Rino.
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Konica 2,8/100
CZJ: 4/20, 2,4/35, 1,8/50 aus jena, 3,5/135MC, Pentacon 1,8/50
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Etc.
RF
Yashica Minister III
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Attila
Joined: 24 Feb 2007
Posts: 57865
Location: Hungary
Expire: 2025-11-18
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| Posted: Fri Nov 14, 2008 9:30 pm Post subject: |
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Attila wrote:
Great one! Many thanks!
_________________
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Items on sale on Ebay
Sony NEX-7 Carl Zeiss Planar 85mm f1.4, Minolta MD 35mm f1.8, Konica 135mm f2.5, Minolta MD 50mm f1.2, Minolta MD 250mm f5.6, Carl Zeiss Sonnar 180mm f2.8
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Jesito
Joined: 24 Aug 2007
Posts: 5745
Location: Olivella, Catalonia, (Spain)
Expire: 2015-01-07
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| Posted: Sat Nov 15, 2008 3:34 am Post subject: |
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Jesito wrote:
Rusty:
Thanks for that nice idea, and thanks for sharing it!
But I'm not sure if this diode will be adequate. It's a standard 1 ampere silicon power diode, and the characteristics sheets only show the behaviour at high currents. They state the voltage drop at a current of 1A will be of 1Volt. But nothing about the low currents used in the cameras.
Have you got the opportunity of measuring the voltage across the battery+diode when the camera is measuring?.
If not it would be interesting to do so, to assure the voltage is right...
Jes.
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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
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CSCCanon EOS-M, Samsung NX100 and NX210, Lumix G5, NEX-F3 |
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Rusty
Joined: 06 Nov 2008
Posts: 435
Location: Mosselbay, South Africa
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| Posted: Sat Nov 15, 2008 12:49 pm Post subject: |
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Rusty wrote:
Jesito said
| Quote: |
| :....Have you got the opportunity of measuring the voltage across the battery+diode when the camera is measuring? |
Hi Jesito have not tested while measuring but have tested with just the Fluke tester as load at 10megaohm with only a few micro amps flowing, the votage is 2.6v
Testing with a 100k ohm load the voltage drops to 2.5v
The current drain of the metering circuit should be well below the 100k mark (otherwise batt will only last a few rolls)
I have only limited knowledge of electronic stuff  but think the voltage drop across the diode junction should stay the same at all loads, providing the diode is forward biased (more than 1.5v across)
see this link http://www.kpsec.freeuk.com/components/diode.htm
Maybe some one in the electronics field can comment and help out?
The camera seems fine but i have not checked the metering against my digital yet
Daniel |
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Jesito
Joined: 24 Aug 2007
Posts: 5745
Location: Olivella, Catalonia, (Spain)
Expire: 2015-01-07
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| Posted: Sat Nov 15, 2008 10:45 pm Post subject: |
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Jesito wrote:
| Rusty wrote: |
Jesito said
| Quote: |
| :....Have you got the opportunity of measuring the voltage across the battery+diode when the camera is measuring? |
Hi Jesito have not tested while measuring but have tested with just the Fluke tester as load at 10megaohm with only a few micro amps flowing, the votage is 2.6v
Testing with a 100k ohm load the voltage drops to 2.5v
The current drain of the metering circuit should be well below the 100k mark (otherwise batt will only last a few rolls)
I have only limited knowledge of electronic stuff but think the voltage drop across the diode junction should stay the same at all loads, providing the diode is forward biased (more than 1.5v across)
see this link http://www.kpsec.freeuk.com/components/diode.htm
Maybe some one in the electronics field can comment and help out?
The camera seems fine but i have not checked the metering against my digital yet
Daniel |
You're rigth. I was thinking on the 1,35V batteries on the Spotmatics...
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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