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What do I need to do to run the train sound board?

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Newbie level 2
Sep 3, 2009
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Power supply question

I'm in over my head, I built a train table for my son and I bought a kit to supply train sounds. The kit is battery powered, 2 AA batteries, but I want to connect it to the power supply from the model train transformer.

The sound kit requires a power supply of 2.4V to 6V. It says is has a standby current less than 1 uA and the operating current is 0.17 to 0.23 mA.

The model train transformer power pack that I want to connect it to is described as follows:

Power pack Input: 120V 50/60 Hz, Output: 17VDC 20VAC, Max output 7VA total. (AC is US Standard)

What do I need to do to run the train sound board on the model train power supply?

I'm a cop not an engineer, so dummy it down for me! Thanks!

Re: Power supply question

You need to use a voltage regulator like the LM7805, I don't remember right now, but I think they can handle an input voltage of 17 volts and will give 5 volts on the output

They are easy to use, just check the heating if they got too hot you need to use a heat disipator, but based on the current consumption of the sound kit it should be OK.

Do not get a LM7805 for SMD use.

Search on the internet for LM7805 to get the information

Added after 1 minutes:

And please do take me to jail if this solution does not work

Added after 36 seconds:

Sorry I mean: Do not take me to jail if the solution does not work

Re: Power supply question

LOL Thanks for the reply, I'll check on that now

Re: Power supply question

Here is a web page with the circuit diagram that you'll need.

Maximum input voltage should absolutely be no more than 35V dc.

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