Identity of part on Marklin 37505 circuit Board

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Identity of part on Marklin 37505 circuit Board - chip marked 'EF'

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Cyborg		#1 Posted : 07 November 2013 08:15:35(UTC) Retweet
Joined: 11/11/2012(UTC) Posts: 107 Location: Maroubra		Hello, I was hoping someone may be able to identify the chip labeled 'EF' on the circuit board of my 37505. I unfortunately cooked it when I mistakenly reversed the wires when I had to replace the electrical plug on the coupler. The chip seems to be a regulator for the LEDS as the headlights/taillights on one end of the railcar now 'flutters'. If I can identify the chip it should be easy to replace. I can't find a circuit diagram for this (or any other) Marklin trains. I have attached a photo with the chip highlighted. thanks for any help forthcoming Paul Cyborg attached the following image(s):


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Chook		#2 Posted : 07 November 2013 08:51:17(UTC) Retweet
Joined: 15/08/2012(UTC) Posts: 234 Location: Perth, Western Australia.		Probably either a darlington transistor or a FET. You will have to trace the cct out and see what feeds it. A FET usually comes directly out of what ever is feeding it where as a transistor usually requires the base to have some resistors either side of it or in series to set the bias. AND you'll have to have a steady hand for the desoldering/soldering! Regards.........Chook.

1 user liked this useful post by Chook		Cyborg
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Cyborg		#3 Posted : 07 November 2013 09:18:22(UTC) Retweet
Joined: 11/11/2012(UTC) Posts: 107 Location: Maroubra		Thanks Chook, I'll leave it to my son who has the steady hand and the air-soldering thingo for surface mounts. regards Paul


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jfhjg		#4 Posted : 07 November 2013 17:20:07(UTC) Retweet
Joined: 29/07/2012(UTC) Posts: 7 Location: Delgany		The part you are looking at appears to be a SOT89 package and the EF code is for a BCV29 Darlington transistor pair. The data sheet is available here: http://www.s-manuals.com.../bcv29%2C_bcv49_nxp.pdf. This should help you track down a replacement. I'd say buy a few as if it went once, 1t could go again... ;-)
		DB: BR86 SBB: 2x Ae6/6; Re620; Ee3/3; Re4/4ii; RAe TEEii; 3x Re481; Ae7/14; Re460

4 users liked this useful post by jfhjg		BrandonVA, xxup, Yumgui, Cyborg
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