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Offline obb_taurus  
#1 Posted : 02 June 2025 03:58:52(UTC)
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obb_taurus

Canada   
Joined: 09/05/2006(UTC)
Posts: 141
Location: ,
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. BigGrin

Thanks
Mike
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Offline H0  
#2 Posted : 02 June 2025 14:47:53(UTC)
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H0


Joined: 16/02/2004(UTC)
Posts: 15,450
Location: DE-NW
Originally Posted by: obb_taurus Go to Quoted Post
I'm assuming it's probably built in because of the front and rear lights but then again, assuming is a very bad idea. BigGrin
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
UserPostedImage
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Offline Dave Banks  
#3 Posted : 02 June 2025 22:04:04(UTC)
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Dave Banks

Australia   
Joined: 08/03/2006(UTC)
Posts: 1,046
Location: Gold Coast, Australia.
This is the lighting board in question:

[img]UserPostedImage[/img]
D.A.Banks
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Offline kiwiAlan  
#4 Posted : 02 June 2025 23:25:34(UTC)
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kiwiAlan

United Kingdom   
Joined: 23/07/2014(UTC)
Posts: 8,491
Location: ENGLAND, Didcot
Originally Posted by: Dave Banks Go to Quoted Post
This is the lighting board in question:

[img]UserPostedImage[/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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Offline H0  
#5 Posted : 03 June 2025 08:10:45(UTC)
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H0


Joined: 16/02/2004(UTC)
Posts: 15,450
Location: DE-NW
Originally Posted by: Dave Banks Go to Quoted Post
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
UserPostedImage
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Offline obb_taurus  
#6 Posted : 03 June 2025 20:18:48(UTC)
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obb_taurus

Canada   
Joined: 09/05/2006(UTC)
Posts: 141
Location: ,
Originally Posted by: kiwiAlan Go to Quoted Post


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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Offline marklinist5999  
#7 Posted : 03 June 2025 23:04:45(UTC)
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marklinist5999

United States   
Joined: 10/02/2021(UTC)
Posts: 3,936
Location: Michigan, Troy
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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Offline Dave Banks  
#8 Posted : 04 June 2025 07:50:25(UTC)
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Dave Banks

Australia   
Joined: 08/03/2006(UTC)
Posts: 1,046
Location: Gold Coast, Australia.
What Mike is asking is can you connect AUX output directly to the two pogo pins ?
D.A.Banks
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Offline H0  
#9 Posted : 04 June 2025 07:57:40(UTC)
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H0


Joined: 16/02/2004(UTC)
Posts: 15,450
Location: DE-NW
Originally Posted by: Dave Banks Go to Quoted Post
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
UserPostedImage
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Offline Dave Banks  
#10 Posted : 04 June 2025 22:31:15(UTC)
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Dave Banks

Australia   
Joined: 08/03/2006(UTC)
Posts: 1,046
Location: Gold Coast, Australia.
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]UserPostedImage[/img]
D.A.Banks
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Offline H0  
#11 Posted : 05 June 2025 07:08:19(UTC)
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H0


Joined: 16/02/2004(UTC)
Posts: 15,450
Location: DE-NW
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
UserPostedImage
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Marklin 39572 DOA (General MRR)
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