Powerpack older 8-pin mLD decoder

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Powerpack older 8-pin mLD decoder

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jonas_sthlm		#1 Posted : 05 April 2024 12:31:11(UTC) Retweet
Joined: 12/10/2008(UTC) Posts: 892 Location: Stockholm, Södermalm		Hi Has anyone manage connect an capacitor on mLD decoder ? I get the capacitor 1500uF to charge U-/U+ but the decoder dies immediately when the power goes off. I find this wiring diagram on moba-hgh.de Edited by user 06 April 2024 09:49:35(UTC) \| Reason: Not specified
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bph		#2 Posted : 05 April 2024 13:32:31(UTC) Retweet
Joined: 04/08/2018(UTC) Posts: 997		Should work.... Could it be that something is not wired correctly. ? e.g. is the diode mounted the right way? this thread might also help: (the instructions on the moba-hgh.de is not the best) https://www.marklin-users.net/forum/posts/t31226-Marklin-Hobby-and-Trix-22075---22097---mSD-upgrade--buffer-capacitor


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jonas_sthlm		#3 Posted : 05 April 2024 15:10:15(UTC) Retweet
Joined: 12/10/2008(UTC) Posts: 892 Location: Stockholm, Södermalm		I probably didn't connect it wrong I used this instruction... The same capacitor works with mSD decoder so why not with mLD.... I dont get it
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jonas_sthlm		#4 Posted : 05 April 2024 21:25:09(UTC) Retweet
Joined: 12/10/2008(UTC) Posts: 892 Location: Stockholm, Södermalm		Someone has succeeded here making it to work with 470yF/35V together with PCB Should this capacitor be requested between GND and +Ub if not using 21MTC PCB for mLD/mSD... Edited by user 07 April 2024 11:10:03(UTC) \| Reason: Not specified
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bph		#5 Posted : 06 April 2024 22:03:46(UTC) Retweet
Joined: 04/08/2018(UTC) Posts: 997		Perhaps you also need a capacitor on the +5v for the decoder processor. ? I have not used capacitors on old mLD but only used them on mSD and as you also noticed it works fine.


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mmervine		#6 Posted : 06 April 2024 23:04:31(UTC) Retweet
Joined: 30/01/2006(UTC) Posts: 1,884 Location: Keene, NH		This video may be helpful:
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jonas_sthlm		#7 Posted : 07 April 2024 13:32:25(UTC) Retweet
Joined: 12/10/2008(UTC) Posts: 892 Location: Stockholm, Södermalm		The video is great but doesn't clarify functionality of mLD decoders... Like I mentioned the powerpack works with the same generation of mSD decoder. Yes the question are, and I will try decoder with circuit board later to see if the +5 capacitors will do the magic By the way how do you know its +5 on the board ?
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