Re: Flicker Free Circuit

Paul Hillman

The bridge-rectifier is necessary if the input is from the track.

In the electronic diagram, the top line always has to be positive, and the bottom line always has to be negative. The bridge always ensures that it is if the input polarity to the bridge is switched, IE) throwing the throttle "reverse" switch in DC, or even setting the car on the track in one direction or the other, DC or DCC.

If the circuit is used with a fixed (unswitchable) power-source, where the input is always the proper + & -, (like in a building - not a RR car) then the bridge isn't needed.

Paul Hillman

--- In, Jim Betz <jimbetz@...> wrote:


The full wave bridge rectifier is small and cheap and, at least
in HO, there is no reason not to use it. And yes, it is why the
circuit works equally well in both DC and DCC.
- Jim
1.1. Re: Caboose Trucks
Posted by: "michaelashelley" mashelley@...
Date: Thu Mar 11, 2010 7:22 am ((PST))

That is very similar to a circuit I've used to run an Atlas
turntable motor using DCC track power. I was later told that
the full wave bridge rectifier is not really needed - although
I think it's necessary if you ever ran the caboose on regular
DC track.

Somone else might want to test the circuit without the rectifier,
since it's been a long time since I took Electrical Circuits 2.

Michael A. Shelley

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