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TOMIX 6421 DC TRACK CLEANING CAR

 

I want to convert this N scale DC ONLY car to run on DCC. The DCC voltage from my Power Cab is 12.4v. This makes the motor run at high speed as if it were 12VDC.
I don't want to tear out the electronics and wire in a DCC decoder like numerous YouTube videos do.
Can I add a diode (half wave) and maybe a resistor across motor input voltage to reduce the motor speed?
If so, what would the DC voltage to the motor be?
Any approach is welcomed.
 

Lawrence,

What's wrong with changing the speeds via the decoder CVs?

Wouter


On Wed, 20 Sept 2023, 22:20 Lawrence Varady, <mrmrsv5049@...> wrote:
I want to convert this N scale DC ONLY car to run on DCC. The DCC voltage from my Power Cab is 12.4v. This makes the motor run at high speed as if it were 12VDC.
I don't want to tear out the electronics and wire in a DCC decoder like numerous YouTube videos do.
Can I add a diode (half wave) and maybe a resistor across motor input voltage to reduce the motor speed?
If so, what would the DC voltage to the motor be?
Any approach is welcomed.

 

Sorry. Never mind. Read it too diagonally. Ignore!


On Wed, 20 Sept 2023, 23:07 Wouter van Doorn, <vandoornw@...> wrote:
Lawrence,

What's wrong with changing the speeds via the decoder CVs?

Wouter

On Wed, 20 Sept 2023, 22:20 Lawrence Varady, <mrmrsv5049@...> wrote:
I want to convert this N scale DC ONLY car to run on DCC. The DCC voltage from my Power Cab is 12.4v. This makes the motor run at high speed as if it were 12VDC.
I don't want to tear out the electronics and wire in a DCC decoder like numerous YouTube videos do.
Can I add a diode (half wave) and maybe a resistor across motor input voltage to reduce the motor speed?
If so, what would the DC voltage to the motor be?
Any approach is welcomed.

 

Not that I'm an expert, but isn't any non-DCC locomotive on a DCC layout operated with the address of 00?
Doug Wagner
Bakersfield CA?
?
In a message dated 9/20/2023 15:09:40 Pacific Daylight Time, vandoornw@... writes:
?
Sorry. Never mind. Read it too diagonally. Ignore!

On Wed, 20 Sept 2023, 23:07 Wouter van Doorn, <vandoornw@...> wrote:

Lawrence,
?
What's wrong with changing the speeds via the decoder CVs?
?
Wouter

On Wed, 20 Sept 2023, 22:20 Lawrence Varady, <mrmrsv5049@...> wrote:
I want to convert this N scale DC ONLY car to run on DCC. The DCC voltage from my Power Cab is 12.4v. This makes the motor run at high speed as if it were 12VDC.
I don't want to tear out the electronics and wire in a DCC decoder like numerous YouTube videos do.
Can I add a diode (half wave) and maybe a resistor across motor input voltage to reduce the motor speed?
If so, what would the DC voltage to the motor be?
Any approach is welcomed.
 

I am looking for a way to modify the DCC RAIL VOLTAGE to DC for the DC motor. NO DECODERS
 

Again, not that I'm a an expert, but I always thought hat the DCC voltage to the tracks was constant and that if you modify the DCC Rail Voltage, that would affect how ALL the DCC locomotives would function.
Doug Wagner
Bakersfield CA?
?
In a message dated 9/20/2023 17:30:49 Pacific Daylight Time, mrmrsv5049@... writes:
?
I am looking for a way to modify the DCC RAIL VOLTAGE to DC for the DC motor. NO DECODERS

 

Putting one diode in series with the motor will probably make it run at half speed.? Trying this out on your bench before opening your track cleaning car.

Putting a resistor across the motor will definitely not help.

Allan
 

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DCC is a AC. You could rectify it with a full wave rectifier chip. And then experiment with different resistors in series on the motor side, to get the speed you are looking for. I assume what you are trying to do is run the car at a constant speed of your choosing on a DCC only layout. ?If you want to control the speed and direction, then you need a separate power source. That¡¯s what I do so I can run both DCC engines and alternatively ones I haven¡¯t converted yet. Use a DPDT center off switch to switch between power sources.


On Sep 20, 2023, at 5:45 PM, Allan AE2V <bigboy@...> wrote:

?Putting one diode in series with the motor will probably make it run at half speed.? Trying this out on your bench before opening your track cleaning car.

Putting a resistor across the motor will definitely not help.

Allan

 

The Tomix car already has the full wave rectifier and so will run at a blazing speed when on DCC powered track. The N scale voltage should be more like six Volts. So a number of series diodes connected to the motor would suffice to drop the voltage sufficiently and pretty easily. I don¡¯t know why I did not think of this. The current demand is just under one Ampere so I would use 1N400X diodes where the x is any number you can get easily. I put in a decoder in my original one but current production requires a pretty beefy decoder IMHO.

Ken Harstine
413-250-8298
 

There should already be a full wave rectifier between the track pick up and the motor so the track cleaning motor will always run in the same direction with either polarity on DC to the track. So add a single diode between one side of the track pick up and the input of the rectifier to half wave rectify DCC. This will cut the average voltage available to the motor to roughly 6 volts.

DonV
 

Thanks,
Just what I needed to know

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