Welcome to my model train Blog. (2017)




Do you have a (N) scale, or (HO) scale, or (O) scale Atlas turntable?


How does an Atlas turntable actually function?
Under the Atlas turntable rotating disk, there is a Geneva movement cam drive system.


* An example of a (6) position Geneva movement.
* The Atlas 12.V-DC motor is always turning.
* At the delayed required index location the 12.V-DC motor is turned "Off".


How the Atlas turntable indexes is an excellent simple procedure. Between the turntable rotating disk and the support base, there are open gaps. These open gaps will allow small foreign debris to fall into the Geneva movement causing indexing problems. Periodically remove the turntable rotating disk and check for any foreign debris that could effect the function of the Geneva movement.

The Atlas turntable is powered by an Atlas 12.V-DC electric motor.
The older electric motors used multiple gears and the newer electric motors now use a belt drive for a quieter operation. The electric motor sounds will vibrate into the plastic turntable frame work, because the electric motor is solidly mounted to the turntable frame work. There are also several internal operating gears and a rotating cam that will also make some noise. Adding model train gear grease to the internal gears will slightly quiet down the unwanted noise. Using gear grease will make it much more difficult to find and clean any foreign debris in the Geneva movement.

Why not mask over the unwanted turntable sound by adding a turntable sound module?

Since the Atlas 12.V-DC electric motor is constantly turning (powered) from start to finish during turntable rotation, a turntable sound module can be easily added.

ITT Products makes many different types of sound modules. (www.ittproducts.com/).
ITT Products <<< (Mouse Click To Link) 
Prior to (2017) there were (HQ) series sound modules manufactured. Now in (2017) there are advanced (GL) series sound modules manufactured. These sound modules, power supply polarity does not matter. At 10.V-DC it requires about 300.mA (3 Watts).
Warning:  In continuous mode (turntable sound), if the voltage is over 14.V-DC it will burn out the sound module.

GL320-1 = Turntable 1 (Sound)
GL320-1 = Turntable 1  <<< (Mouse Click To Link)

GL320-2 = Turntable 2 (Sound)
GL320-2 = Turntable 2  <<< (Mouse Click To Link)


Digital Command Control (DCC):
- OR-
Digital Command System (DCS):
* (DCC) or (DCS) will control the turntable track power supply.
* Require a separate 12.V-DC power supply.
* The D.P.D.T. (center off) switch controls  rotation directions and stop rotation position.
* Recommend using a high quality wire terminal to insure excellent wire connections (x6).
* The D.P.D.T. (center off) switch also turns the sound module On and Off.


V-DC Track (Atlas Controller - Turn Table):
* Atlas Controller #220
* The rotation speed of the turntable is directly controlled by the throttle V-DC power supply.
* If the throttle position is under 9.V-DC the sound module will not operate correctly.
Warning: If the voltage is over 14.V-DC it will burn out the sound module.


V-DC Track: (Standard Operations)
* Require a separate 12.V-DC power supply.
* A safety feature adding a D.P.D.T. (Track) switch to control the turntable track power supply.
* A bi-polar (5.MM .196") Red and Green  LED to indicate turntable track power supply.
* LED Red = track power OFF
* LED Green  = track power ON.
* A required resistor (R1) is required when using an LED.
* The D.P.D.T. (center off) switch controls rotation directions and stop rotation position..
* Recommend using (2) high quality wire terminals to insure excellent wire connections (x12).
* The D.P.D.T. (center off) switch also turns the sound module On and Off.


Required (R1) resistor calculation.
Example:
* Bi-polar (5.MM .196" Dia.) LED
* Rated at 2.2 V-DC
* Rated at 20mA maximum
Calculation:
LED - Resistor Calculator (Mouse Click To Link)
[12] Source voltage
[2.2] diode forward voltage
[20] diode forward current (mA)



Speaker Also Required:
Use a 4" inch (square flange) 8 Ohm speaker, for much better sound quality and much easier to mount facing down under the turntable. Use rubber "O" rings between the speaker flange and wooden mounting surface to prevent sound vibrations. Use correct speaker polarity connections. Speakers correctly connected, will "push" the sound "out". Speakers  in-correctly connected, will "pull" the  sound "in".


Direct e-mail contact only regarding my Blogs:  gtrs.trains@gmail.com 

© 2017 ITT Products (www.ittproducts.com/).  ITTP Images and Sounds

Posted by Grand Trunk Railway System at Sept.01/2017