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6080 decoder - tandem drive
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Offline cintrans  
#1 Posted : 12 July 2025 18:03:29(UTC)
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cintrans

Aruba   
Joined: 11/07/2018(UTC)
Posts: 218
Location: Aruba (general), Oranjestad
Hi all

I have some NOS 6080 decoders laying around and was thinking of building up a tandem (double drive) F7 using spare parts.
I would use the original 3 pole motor with either one or 2 6080 decoders but only one common slider.
Anyone ever done that with decent results?

Regards
Jean-Pierre
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Offline JohnjeanB  
#2 Posted : 12 July 2025 19:33:41(UTC)
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JohnjeanB

France   
Joined: 04/02/2011(UTC)
Posts: 3,586
Location: Paris, France
Hi Jean-Pierre
The 6080 Märklin decoders are of the very first generation dealing with Motorola (Not MM2) so the direction bit is not decoded.
Long story short: you cannot use independent 6080 decoders even with the same slider to drive 2 motors as you run the risk they could run in opposite directions.
Märklin never used 6080 decoders to drive two-motor units (M. used stronger drivers instead).
I think some Märklin fans did try to drive 2 motors with one 6080 and it would probably work as long as you avoid peak currents caused by stalled motors
Note: driving a twin motor unit with a 60906 all-current decoder, capable of 1.6 A motor current would do it probably better
Cheers
Jean
My layout videos
latest vid
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Offline kiwiAlan  
#3 Posted : 12 July 2025 21:13:45(UTC)
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kiwiAlan

United Kingdom   
Joined: 23/07/2014(UTC)
Posts: 8,512
Location: ENGLAND, Didcot
Originally Posted by: JohnjeanB Go to Quoted Post

Märklin never used 6080 decoders to drive two-motor units (M. used stronger drivers instead).


The decoder used in the original 3649 ENMD F7 Demonstrator loco is certainly based on the 6080 decoder, but I haven't checked what they have done to drive the two motors compared to a standard 6080. The decoder uses the original LME07 chip which predates the 717.xx series chips used in the 6090 and later decoders.
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Offline JohnjeanB  
#4 Posted : 13 July 2025 13:04:46(UTC)
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JohnjeanB

France   
Joined: 04/02/2011(UTC)
Posts: 3,586
Location: Paris, France
Hi
Here is an example of Märklin's way of driving two A/C motors in parallel
Here on a 2-motors A-B-A GM EMD F7 unit where you may see the separate stronger drivers for the motors

Sans titre.png

Cheers
Jean
My layout videos
latest vid
marshalling yard
My Layout
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