Wondering why this works.....

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Wondering why this works..... - how come the LEDs don't blow...

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DaleSchultz		#1 Posted : 12 July 2018 04:26:53(UTC) Retweet
Joined: 10/02/2006(UTC) Posts: 3,997		so 11 years ago I made a simple K83 tester: http://cabin-layout.blogspot.com/2007/03/k83-tester.html I looked at the page again today and it struck me that there is no diode in the circuit! I can't recall if the output of the k83 is DC or if it is AC? if it is AC I would expect the LEDs to dislike the reverse current each cycle. Anyone know?
		Dale Intellibox + own software, K-Track My current layout: https://cabin-layout.mixmox.com Arrival and Departure signs: https://remotesign.mixmox.com
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clapcott		#2 Posted : 12 July 2018 11:52:11(UTC) Retweet
Joined: 12/12/2005(UTC) Posts: 2,435 Location: Wellington, New_Zealand		A k83 (Marklin 6083,60830) "yellow" provides a pedestal -22V DC (worth noting that the m83 (Marklin 60831,60832) provides -16V DC) The Red and Green outputs switch/pulse to provide a path "down" (from Ground/0/Common ) (worth noting that the m83 uses a trickle/monitoring current which will appear to show the LEDs on in the non-energised state. thus you need a pull-up resistor to turn LEDs off fully) example = https://www.marklin-user...s--CS3--m8--2#post442831 Thus your LEDs will have their cathode (flat) towards the yellow.
		Peter

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DaleSchultz		#3 Posted : 12 July 2018 14:05:43(UTC) Retweet
Joined: 10/02/2006(UTC) Posts: 3,997		OK thanks for confirming it is DC. I must have measured it and aligned the cathodes correctly!
		Dale Intellibox + own software, K-Track My current layout: https://cabin-layout.mixmox.com Arrival and Departure signs: https://remotesign.mixmox.com
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applor		#4 Posted : 12 July 2018 23:47:15(UTC) Retweet
Joined: 21/05/2004(UTC) Posts: 1,654 Location: Brisbane, Queensland		edit: miss-post. Edited by user 24 July 2018 01:54:33(UTC) \| Reason: Not specified
		modelling era IIIa (1951-1955) Germany


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DaleSchultz		#5 Posted : 13 July 2018 15:14:41(UTC) Retweet
Joined: 10/02/2006(UTC) Posts: 3,997		I think you rpost is on the wrong thread.... but I always thought it allowed the customer to place the pole as far away from track center as needed, and they can then cut to whatever length is needed.
		Dale Intellibox + own software, K-Track My current layout: https://cabin-layout.mixmox.com Arrival and Departure signs: https://remotesign.mixmox.com
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JohnjeanB		#6 Posted : 13 July 2018 16:55:37(UTC) Retweet
Joined: 04/02/2011(UTC) Posts: 3,124 Location: Paris, France		Hi Dale, The most important things have been said above On the Following link you can find the "Schaltplan" (electrical diagram) of a 6083 http://www.jaray.ch/eisenbahn/k83.htm Cheers Jean
		My layout videos latest vid marshalling yard My Layout

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