Garden Railway Forum

Posted: **Fri May 22, 2026 8:04 am**

Hello,

I am considering adding a sound card to my one and only battery loco. However I cannot find one that has a working voltage as low as the 6 volts available from the battery that is in the loco. The one I am looking at is the Micron Mini Sound Module (MSND01) but the bumf makes it clear that 7volts is the absolute minimum voltage. I have read about but have no knowledge of "voltage upscalers" or whatever they are called but havent a clue what to look for or where to buy. As usual there isnt a lot of space to add the sound module, the "upscaler" and the speaker.
Can anyone help please. It doesnt have to be the Micron - anything that will work with this voltage will be considered.

Thank you in anticipation.

BryanW

Posted: **Fri May 22, 2026 3:49 pm**

BryanW wrote: ↑Fri May 22, 2026 8:04 am Hello,

I am considering adding a sound card to my one and only battery loco. However I cannot find one that has a working voltage as low as the 6 volts available from the battery that is in the loco. The one I am looking at is the Micron Mini Sound Module (MSND01) but the bumf makes it clear that 7volts is the absolute minimum voltage. I have read about but have no knowledge of "voltage upscalers" or whatever they are called but havent a clue what to look for or where to buy. As usual there isnt a lot of space to add the sound module, the "upscaler" and the speaker.
Can anyone help please. It doesnt have to be the Micron - anything that will work with this voltage will be considered.

Thank you in anticipation.

BryanW

Hi Bryan
If you search for step up converter on eBay you het dozens eg - https://ebay.us/m/GnGAYF
This is adjustable so you'd need a multimeter to set it to the value you want.

If you want a basic diesel sound, you can get them more cheaply. This runs on 3.6v - 8v - https://ebay.us/m/wytQ2r

The MTroniks card is very good. Not sure if it works on 6v it just says 12v max - https://www.cornwallmodelboats.co.uk/ac ... 5MSMT.html

Edit: Just found the more recent version of this module on the MTroniks website and it does operate from 6 to 12v - https://www.mtroniks.net/prod/Sound-Sys ... escription

Rik

Posted: **Fri May 22, 2026 4:03 pm**

Another possibility is a Train Tech module. Completely self contained and very small. However, not really a narrow gauge steam or diesel sound - eg https://www.petersspares.com/p/train-te ... nd-capsule

Rik

Garden Railway Forum

Sound card for 6 volt supply

Sound card for 6 volt supply

Re: Sound card for 6 volt supply

Re: Sound card for 6 volt supply