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RailPro Discussion & Help / Re: siemens charger engine sound
« Last post by ON28 on Today at 11:30:17 PM »
The sound of silence, based on the Chargers' failure rate.

Sorry, that isn't helpful.  :)
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RailPro Discussion & Help / Re: Have USA G Switcher hook up smoke generators
« Last post by ironacres on January 18, 2021, 07:02:11 PM »
Yes I was considering the power draw and how much I want smoke.  Compared to the low volts that the Aristocraft units use.  I have a 5 volt relay, will try and see what the battery time is.  I am also installing a servo trigger board for my Kadee RC couple, no draw to speak of. Yes 5 volts relay output on LM to answer your question.   I looked and did see it is a voltage regulator, I should know better.  Thanks all for the continuing help.   [ You are not allowed to view attachments ]
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RailPro Discussion & Help / siemens charger engine sound
« Last post by Cbrocco on January 18, 2021, 06:53:58 PM »
Does any one have a Siemens Charger prime mover sound or have suggestions at which sound would come close?

TIA,
Chris
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RailPro Discussion & Help / Re: Have USA G Switcher hook up smoke generators
« Last post by MichaelK on January 18, 2021, 06:27:25 PM »
Many of us that run battery power just eliminate smoke units because they use too much power reducing run time.

Yep! There's the best answer right there. USA Trains - I have four GP-9's, one F-3A/B combo, and one NW2. Drains the batteries like there's no tomorrow, so I took all of the smokers out of 'em.
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RailPro Discussion & Help / Re: Have USA G Switcher hook up smoke generators
« Last post by Alan on January 18, 2021, 08:44:29 AM »
Check your chip - the separate 3 wire device that is attached to the weight.  On both my NW2s it is a single TIP 122 Darlington transistor and only used for the smoke.

That makes a ton of sense. Exactly what is expected. Now we also know why the package isn't mounted to the board. I imagine the weight makes an excellent heat sink which will certainly be needed in this application.

Still curious why the little transistor...
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RailPro Discussion & Help / Re: Have USA G Switcher hook up smoke generators
« Last post by Joel W on January 18, 2021, 08:19:29 AM »
Check your chip - the separate 3 wire device that is attached to the weight.  On both my NW2s it is a single TIP 122 Darlington transistor and only used for the smoke - the light bulbs are high voltage bulbs, On most of my other USA Trains engines there are two transistors - both voltage regulators - and the bulbs/LEDs are low voltage.

As others have mentioned, be sure to put a diode (like a 4001) across the relay coil leads to block the backwards voltage spike that will occur when the relay turns off.
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RailPro Discussion & Help / Re: Have USA G Switcher hook up smoke generators
« Last post by Alan on January 17, 2021, 09:32:10 PM »
So, it is a LM7805 regulator in the picture? Interesting that it doesn't have a stabilization capacitor. Out of curiosity, what is the 5V supply used for on G locos? Bulbs and LEDs maybe?

What is the small transistor used for?

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General Discussion / Re: Free Storage Discrepancy?
« Last post by Espeelark on January 17, 2021, 06:50:45 PM »
OK - thanks!
I was thinking that RP Assistant was reflecting/listing what the "Free Storage" status was on my HC-2b and therefore the question since one said 96% and the other 61%.
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RailPro Discussion & Help / Re: Have USA G Switcher hook up smoke generators
« Last post by JRad on January 17, 2021, 06:33:49 PM »
There are no transistors in the USA Trains smoke circuit. The square item on the board is a bridge rectifier and the three legged device is a voltage regulator.

The LM-3S-G outputs are all switched grounds.  Source voltage is EITHER the +5 terminal or the V+ terminal. V+ will output a volt or two under the battery voltage due to circuit losses.

I agree that you need a relay or a power transistor circuit for the smoke. Trying to pull that much current through the LM will either shut it down, or burn it up.  You could use either a 5 volt or 18 volt relay with one side of the coil attached to an output (ground) and the other side to either +5 or V+ depending on coil voltage.

Many of us that run battery power just eliminate smoke units because they use too much power reducing run time.
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General Discussion / Re: Free Storage Discrepancy?
« Last post by William Brillinger on January 17, 2021, 04:57:19 PM »
The HC and the RPA software both have their own finite storage capacity.
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