DC relay buzz

For track power

Command

You could do this with a 24VDC relay,bridge rectifier and capacitor. With DCS add a choke. I run conventional and use a separate 24VDC power supply for relay power made with an 18 volt brick,a bridge rectifier and capacitor. When charged to peak this is 24VDC.

Conventional

You could do it with a 5 volt relay hooked to a 7805 regulator circuit.

Dale H

 I'm  thinking  more of  the  Buzz issue.   Wouldn't take much to move the Acc (hot) over to  track hot  and just raise the handle to around 12 volts just to see if the Buzz goes away. I think it will.

Or at least make sure the Aux  common and track common are common to each other.

Gregg

On a DC relay you should use a capacitor. The capacitor increases pulsed DC by 40 %. The capacitor is what removes the buzz. The relay circuit need have nothing to do with the train circuit except for the shared common. The 10 volts AC will  work the 12 VDC relay.

Dale H

I agree about the cap.... As I mentioned I tried to use a large BR hooked to the accessory posts  (D&E if I remember correctly)  with my trusty KW as a DC power supply. Turn table motor etc.,  Maybe also  tortoise switch machines. This part worked but had nothing to do with the track.

I also tried feeding one side of the created  dc  to power track side relays  by letting one side of the dc - ride on the outside rail. The other side of dc + went directly to the dc relay.....  Wheels completed circuit. It just didn't  work  . Eventually  I had  to use a BR at each relay.. Yes with caps to prevent wheel chatter.   Phasing issue??

Is this similar ??? 

If you use a separate transformer you need only 1 bridge rectifier regardless of the number of relays. Just share one of the polarized bridge terminals with the track common,the minus for example.

Here is one example,see the coil circuit

www.jcstudiosinc.com/TrolleyStopsForTrain

Here is another,see coil circuit

www.jcstudiosinc.com/BlogShowThread?id=856

I run over 300 relays on my layout with this method,powered by a lionel 180w brick. It works.

Dale H