 Joined: 09/05/2006(UTC) Posts: 141 Location: ,
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Hi Everyone, With a new motor en route to replace the Sinus motor in my currently dead 39572, I'm close to starting the project of fixing the locomotive. One thing I was wondering about, I am using the 51957 adapter plate from ESU as the replacement board and will be make-shifting something to get the engine room lighting to work but one thing I'm wondering about is since I will be connecting those to an auxiliary function, do I still need to add a resistor or is that built into the 51957. I'm assuming it's probably built in because of the front and rear lights but then again, assuming is a very bad idea.  Thanks Mike
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 3 users liked this useful post by obb_taurus
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Joined: 16/02/2004(UTC)
Posts: 15,466
Location: DE-NW
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Originally Posted by: obb_taurus  I'm assuming it's probably built in because of the front and rear lights but then again, assuming is a very bad idea. Why should a general-purpose decoder board have resistors for LEDs built-in? They don't know how many LEDs you will connect or if you will use light bulbs. Some locos have resistors on the LED boards, some locos have resistors on the decoder board. Better add resistors for the first test - unless you can positively identify resistors on the LED boards. |
Regards Tom --- "In all of the gauges, we particularly emphasize a high level of quality, the best possible fidelity to the prototype, and absolute precision. You will see that in all of our products." (from Märklin New Items Brochure 2015, page 1) ROFLBTCUTS  |
2 users liked this useful post by H0
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 Joined: 08/03/2006(UTC) Posts: 1,047 Location: Gold Coast, Australia.
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This is the lighting board in question: [img]  [/img] |
D.A.Banks |
1 user liked this useful post by Dave Banks
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 Joined: 23/07/2014(UTC) Posts: 8,509 Location: ENGLAND, Didcot
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Originally Posted by: Dave Banks This is the lighting board in question: [img] [/img] Well, that definitely has a resistor on the board. but Mike is looking at replacing the board that those pogo pins contact, which will make life interesting.
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1 user liked this useful post by kiwiAlan
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Joined: 16/02/2004(UTC)
Posts: 15,466
Location: DE-NW
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Originally Posted by: Dave Banks This is the lighting board in question There are also front and rear lights. |
Regards Tom --- "In all of the gauges, we particularly emphasize a high level of quality, the best possible fidelity to the prototype, and absolute precision. You will see that in all of our products." (from Märklin New Items Brochure 2015, page 1) ROFLBTCUTS |
1 user liked this useful post by H0
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Joined: 09/05/2006(UTC) Posts: 141 Location: ,
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Originally Posted by: kiwiAlan
Well, that definitely has a resistor on the board.
but Mike is looking at replacing the board that those pogo pins contact, which will make life interesting.
I’m not looking to replace the board shown in the picture from Dave, I’m replacing the main board along with the Sinus motor because the locomotive suffered from a voltage issue common to this model which damaged the main board and driver for the Sinus motor. I’m using the ESU 51957 to replace the existing main board since I’m also replacing the motor. In the manual for the 51957, it says from Aux3 and onward the outputs are reinforced with MOS-FET 250mA transistors, so I’m not sure if resistors are still needed.
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1 user liked this useful post by obb_taurus
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 Joined: 10/02/2021(UTC) Posts: 3,961 Location: Michigan, Troy
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Oh, that depends on the design parameters. Resistors are used with transistors to stabilize switching and signal curve. With bipolar transistors, resistors are used as a Baker clamp because they are not as controlled as fets. They use holes and only have one entry point.fets have a gate, another entry, ground and emitter. They can run hotter because they are always biasing. So a resistor(s) may be used ahead of to control heat. The difference between the two is that bipolar transistors are voltage operated and fets are current operated or amperage.
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Joined: 08/03/2006(UTC) Posts: 1,047 Location: Gold Coast, Australia.
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What Mike is asking is can you connect AUX output directly to the two pogo pins ?
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D.A.Banks |
1 user liked this useful post by Dave Banks
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Joined: 16/02/2004(UTC)
Posts: 15,466
Location: DE-NW
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Originally Posted by: Dave Banks What Mike is asking is can you connect AUX output directly to the two pogo pins? As Alan wrote in post #4, there are resistors on the board, so it can be connected directly to a decoder output. Check which is plus and which is minus. |
Regards Tom --- "In all of the gauges, we particularly emphasize a high level of quality, the best possible fidelity to the prototype, and absolute precision. You will see that in all of our products." (from Märklin New Items Brochure 2015, page 1) ROFLBTCUTS |
1 user liked this useful post by H0
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Joined: 08/03/2006(UTC) Posts: 1,047 Location: Gold Coast, Australia.
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Tom can we assume looking at the old destroyed board that where the pogo pins make contact that the +ve marking is indeed +ve from Aux 3 output or +ve electronic ground. I know its a bit of a silly question but given we are not talking about a normal chassis ground. [img]  [/img] |
D.A.Banks |
1 user liked this useful post by Dave Banks
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Joined: 16/02/2004(UTC)
Posts: 15,466
Location: DE-NW
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I guess the left pad is + and not switched by the decoder while the right pad is - and switched by the decoder (maybe AUX1).
Better use a continuity tester to verify. |
Regards Tom --- "In all of the gauges, we particularly emphasize a high level of quality, the best possible fidelity to the prototype, and absolute precision. You will see that in all of our products." (from Märklin New Items Brochure 2015, page 1) ROFLBTCUTS |
1 user liked this useful post by H0
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