Swap decoder in lok 37814 that has buffer capacitor

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Swap decoder in lok 37814 that has buffer capacitor

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Dirtboy		#1 Posted : 24 August 2025 18:25:12(UTC) Retweet
Joined: 01/12/2014(UTC) Posts: 58 Location: Dallas, TX		I have the new Märklin 051 lok (37814) that comes from factory with a buffer capacitor. I'd like to swap out the factory decoder for an ESU LokSound5 decoder. I just don't like the way Märklin does their steam sounds. Does anyone know if I will be able to program the CV's needed for the buffer capacitor into the ESU decoder? I compared the buffer capacitor CV's of the lok to the CV table of the stand-alone buffer capacitor 60974 and not all of the CV's are listed on the lok (at least from reading the lok on the CS3). Does anyone have any insight to this? Here is the lok in question:


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kiwiAlan		#2 Posted : 24 August 2025 18:45:08(UTC) Retweet
Joined: 23/07/2014(UTC) Posts: 8,538 Location: ENGLAND, Didcot		Originally Posted by: Dirtboy I have the new Märklin 051 lok (37814) that comes from factory with a buffer capacitor. I'd like to swap out the factory decoder for an ESU LokSound5 decoder. I just don't like the way Märklin does their steam sounds. Does anyone know if I will be able to program the CV's needed for the buffer capacitor into the ESU decoder? I compared the buffer capacitor CV's of the lok to the CV table of the stand-alone buffer capacitor 60974 and not all of the CV's are listed on the lok (at least from reading the lok on the CS3). Does anyone have any insight to this? To use a buffer capacitor with the ESU decoder you will need to use an ESU buffer capacitor, not the Marklin one. The ESU capacitor does not have on-board CVs like the Marklin one, but one of the normal Aux outputs is used to control it. Refer to the ESU documentation for details.

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Dirtboy		#3 Posted : 24 August 2025 19:19:23(UTC) Retweet
Joined: 01/12/2014(UTC) Posts: 58 Location: Dallas, TX		Originally Posted by: kiwiAlan To use a buffer capacitor with the ESU decoder you will need to use an ESU buffer capacitor, not the Marklin one. The ESU capacitor does not have on-board CVs like the Marklin one, but one of the normal Aux outputs is used to control it. Refer to the ESU documentation for details. I have several loks with ESU decoders and ESU buffer capacitors so I'm familiar with them. I'm not familiar with the new Märklin buffer capacitors built-in to the loks from the factory. Is there a way to bypass them without de-soldering them from the Märklin decoder adapter board?


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Goofy		#4 Posted : 25 August 2025 18:36:54(UTC) Retweet
Joined: 12/08/2006(UTC) Posts: 9,312		Originally Posted by: Dirtboy I have the new Märklin 051 lok (37814) that comes from factory with a buffer capacitor. I'd like to swap out the factory decoder for an ESU LokSound5 decoder. I just don't like the way Märklin does their steam sounds. Does anyone know if I will be able to program the CV's needed for the buffer capacitor into the ESU decoder? I compared the buffer capacitor CV's of the lok to the CV table of the stand-alone buffer capacitor 60974 and not all of the CV's are listed on the lok (at least from reading the lok on the CS3). Does anyone have any insight to this? There is no buffer capacitor in the model. I did just checked at Märklins homepage and there are no information about buffer capacitor! How did you get this locomotive with the power cap?
		H0 DCC = Digital Command Control


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Dirtboy		#5 Posted : 25 August 2025 19:01:19(UTC) Retweet
Joined: 01/12/2014(UTC) Posts: 58 Location: Dallas, TX		Originally Posted by: Goofy There is no buffer capacitor in the model. I did just checked at Märklins homepage and there are no information about buffer capacitor! How did you get this locomotive with the power cap? I guess Märklin forgot to add this detail on their website as well as in the instruction manual included with the lok. I can assure you, this lok definitely has not only one, but two buffer capacitors in it. Buffer 1 is for sound and motor and buffer 2 is for lights and AUX outputs. When I cut power to the track, the lok keeps running for a second or two and the sound continues. Plus, you can see in the lok's setup menu on the CS3 that the capacitor is labeled as an "electronic flywheel": I don't know why Märklin didn't announce that this lok has a buffer capacitor...

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bph		#6 Posted : 25 August 2025 22:20:56(UTC) Retweet
Joined: 04/08/2018(UTC) Posts: 1,195		Originally Posted by: Dirtboy Originally Posted by: Goofy There is no buffer capacitor in the model. I did just checked at Märklins homepage and there are no information about buffer capacitor! How did you get this locomotive with the power cap? I guess Märklin forgot to add this detail on their website as well as in the instruction manual included with the lok. I can assure you, this lok definitely has not only one, but two buffer capacitors in it. Buffer 1 is for sound and motor and buffer 2 is for lights and AUX outputs. When I cut power to the track, the lok keeps running for a second or two and the sound continues. Plus, you can see in the lok's setup menu on the CS3 that the capacitor is labeled as an "electronic flywheel": I don't know why Märklin didn't announce that this lok has a buffer capacitor... You are probably right, and the locomotive has a buffer capacitor. But if it has two?, they are probably linked. The menu probably only refers to configuration setting 1 and configuration setting 2, not separate capacitors. One setting I notice is that AUX 4 is always on, and AUX 4 is configured to the Voltage buffer control setting. So you need to check with ESU, regarding compatibility.

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Dirtboy		#7 Posted : 26 August 2025 00:10:12(UTC) Retweet
Joined: 01/12/2014(UTC) Posts: 58 Location: Dallas, TX		Originally Posted by: bph You are probably right, and the locomotive has a buffer capacitor. But if it has two?, they are probably linked. The menu probably only refers to configuration setting 1 and configuration setting 2, not separate capacitors. One setting I notice is that AUX 4 is always on, and AUX 4 is configured to the Voltage buffer control setting. So you need to check with ESU, regarding compatibility. You're correct about the lok only having one capacitor: I thought it may have been the same setup as the 60974 add on capacitor from Märklin:

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Goofy		#8 Posted : 26 August 2025 05:45:44(UTC) Retweet
Joined: 12/08/2006(UTC) Posts: 9,312		Be attention about PCB! I don´t believe you can put ESU sound decoder there. ESU does not have same output physical functions like Märklin do have.
		H0 DCC = Digital Command Control


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