Problem with decoder k83 and 60832

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Problem with decoder k83 and 60832 - Driving of turnout motors

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tomcat20000		#1 Posted : 05 June 2025 02:23:17(UTC) Retweet
Joined: 14/02/2024(UTC) Posts: 3 Location: California, Pleasanton		Hi, Recently re-activated this model train hobby after my retire from work. c-track based old stuff acquired largely more 20 years ago. Now trying to build a layout with automated train operation using CS3+. Acquired 60832 and new turnout motors to work with my existing/old k83 and turnout motors. My problem now as follows: - k83 with new turnout motors - works fine; - 60832 with new turnout motors - works fine; - k83 with old turnout motors - works intermittently; - 60832 with old turnout motors - works fine. I have tried different turnout motor activation time settings in CS3 and problem still exist. Not sure if 60832 has better driving power than the old k83? Hope veterans here can shed some lights. Thanks!

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JohnjeanB		#2 Posted : 05 June 2025 12:15:06(UTC) Retweet
Joined: 04/02/2011(UTC) Posts: 3,569 Location: Paris, France		Hi TomCat A warm welcome to this great forum Here a Märklinist from Paris having used k83 since 1988. I use also m83 with a CS3 and C Track. - K83 (6083) must be able to power any solenoid accessory. The only thing is a direct digital power feed is a must (not from the track) - K83 allow longer duration in commands (as long as you push on the button, the solenoid is activated). This may lead to a burned solenoid and K83 transistor is some cases - M83 have a build-in turn off feature (max 500 mS) after which they chop the current for safety - I still use 6083 on my layout but replace them slowly by 60832 K 83 have a biblical simplicity and there is no reason for them NOT to work unless there is something burned inside Here is a first version of k83 (1985 till 1995) So I suggest you check the wiring or a possible damage tp your K83 Cheers Jean
		My layout videos latest vid marshalling yard My Layout

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tomcat20000		#3 Posted : 05 June 2025 18:36:20(UTC) Retweet
Joined: 14/02/2024(UTC) Posts: 3 Location: California, Pleasanton		Hi Jean! Thanks very much for the kind elaboration and advice! In fact, I have compared how k83 and 60832 driving the same turnout motor under same conditions. when 60832 drives, the turnout gives a stronger switching sound than k83. Therefore I suspect that 60832 has a stronger drive than k83 though they are drawing the same power from the track maybe due to different hardware design. Based on this thinking, your suggested direct power feed seems the correct way to go to solving this problem. On that I maybe able to use my surplus power supply from a digital starter set acquired last year. Cheers, TC


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JohnjeanB		#4 Posted : 05 June 2025 23:42:27(UTC) Retweet
Joined: 04/02/2011(UTC) Posts: 3,569 Location: Paris, France		Hi I forgot to mention the other possibility: Electrolitic capacitors have a way of reducing their value with time with in return reduces the energy locally stored in the K83 and then the energy available for the switch motor. Newer m83 also use more modern transistor switches (MOSFETs I think) with reduced internal resistance A direct feed of the K83 may help compensate but with at least a 0.5 mm² Cheers Jean
		My layout videos latest vid marshalling yard My Layout

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tomcat20000		#5 Posted : 06 June 2025 06:13:21(UTC) Retweet
Joined: 14/02/2024(UTC) Posts: 3 Location: California, Pleasanton		Yeah. E cap as a means for energy storage may deteriorate against time. That's one of the possible explanation of reduced drive power for the old k83.

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BenPerr		#6 Posted : 06 June 2025 16:16:53(UTC) Retweet
Joined: 19/07/2023(UTC) Posts: 24 Location: North Carolina, Charlotte		Ahhh, the 'good-old' Motorola MC145027 chip... bring me back to when I was young and playing with Elektor Edits... Jean is right - replace the 2 electrolytic capacitor in there (big one for sure) and I'm pretty sure you'll be good as new! Benoit

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