help identify these **56K beware** - Electronic Circuits Projects Diagrams Free

earz_cd · 12th January 2005, 08:44 AM

this may be impossible for some/easy for others - i'm a newb so i'm not sure. I took a LED taillight apart from a wrecked motorcycle and need help indentifying 2 pieces of the circuit. the LED's and resistors are not a problem, but if anyone can shed some light on what the name and function of the 2 mystery pieces it would be greatly appreciated. (sorry for the large pix)

checkmate · 12th January 2005, 08:59 AM

I don't really know what they are, but the labeling does suggests that they are diodes and zener diodes. Try running diode tests across them.

earz_cd · 12th January 2005, 09:17 AM

Quote:

Originally Posted by checkmate

I don't really know what they are, but the labeling does suggests that they are diodes and zener diodes. Try running diode tests across them.

like i said - i'm a newb. i'm not quite sure how i would do that. I know i need a DMM, but what kind of readings am i looking for?

TheOne · 12th January 2005, 03:02 PM

Look up possible partno's (then search Google) against the codes here
http://www.tkb-4u.com/code/smdcode/smdcode2.php

Juglenaut · 12th January 2005, 05:24 PM

I would say the ZD1 is a Zener Voltage regulator, and the 2 Diodes are general purpose 1amp or slighly more.

Exo · 12th January 2005, 09:53 PM

JC - 2J -> BAL74 (Siemens) SOT23 fast switch diode 50V 0.25A
27C -> 27 Volt zener diode - Mf unknown - Power unknown
at least 27V is what the book says, but i'm unsure how a 27V diode would end up on a motocycle...

earz_cd · 13th January 2005, 01:54 AM

Quote:

Originally Posted by Exo

JC - 2J -> BAL74 (Siemens) SOT23 fast switch diode 50V 0.25A
27C -> 27 Volt zener diode - Mf unknown - Power unknown
at least 27V is what the book says, but i'm unsure how a 27V diode would end up on a motocycle...

that can't be right b/c SOT23 is a three prong SMD and the JC-2J above is only two prong.

and the circuit is not made by the motorcycle manufacturer. It has a KOITO marking on the board.

Exo · 13th January 2005, 02:18 AM

Quote:

Originally Posted by earz_cd

that can't be right b/c SOT23 is a three prong SMD and the JC-2J above is only two prong.

and the circuit is not made by the motorcycle manufacturer. It has a KOITO marking on the board.

Sot 23 is the size (2 by 3 mm) - 2 or 3 prong - it has the same name

i don't care who made it. it came of a motocycle and they run on 6V, 12V ?? - why would they use a 27V zener in that ? ...
but the databook says 27C - zener 27V

earz_cd · 13th January 2005, 02:37 AM

cool thanks for the info.

any idea on the other piece - possibly where i could find one?

gmphadte · 14th January 2005, 10:40 AM

Hope there is no DC/Dc converter in there.

Zeners are used as protection for other devices and in such case the zener voltage is higher than dc voltage.

Gajanan Phadte

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12th January 2005, 08:59 AM	(permalink)
checkmate	I don't really know what they are, but the labeling does suggests that they are diodes and zener diodes. Try running diode tests across them.

12th January 2005, 03:02 PM	(permalink)
TheOne	Look up possible partno's (then search Google) against the codes here http://www.tkb-4u.com/code/smdcode/smdcode2.php __________________ \"You can\'t make a circuit fool-proof, cause fools are so ingenious!\"

12th January 2005, 05:24 PM	(permalink)
Juglenaut	I would say the ZD1 is a Zener Voltage regulator, and the 2 Diodes are general purpose 1amp or slighly more. __________________ Your website has been blocked

12th January 2005, 09:53 PM	(permalink)
Exo	JC - 2J -> BAL74 (Siemens) SOT23 fast switch diode 50V 0.25A 27C -> 27 Volt zener diode - Mf unknown - Power unknown at least 27V is what the book says, but i'm unsure how a 27V diode would end up on a motocycle...

13th January 2005, 02:37 AM	(permalink)
earz_cd	cool thanks for the info. any idea on the other piece - possibly where i could find one?

14th January 2005, 10:40 AM	(permalink)
gmphadte	Hope there is no DC/Dc converter in there. Zeners are used as protection for other devices and in such case the zener voltage is higher than dc voltage. Gajanan Phadte