A picture of the building on the module:
As I explained in the July 2019 posts, contained inside the building is a small rechargeable power supply of the kind that is designed to provide power to a cell phone when a charger can't be used. This works fine but it becomes a nuisance having to switch out the rechargeable power supply when it runs out after 4 hours, give or take.
Some time ago I built a supply of circuit boards for our train club designed to convert 16 volt AC power (the Free-mo standard for the accessory power bus which runs under the Free-mo modules) to various DC voltages which are used by a variety of model railroad accessories, such as building lighting or other animation. I use a Digitrax booster to power this bus because it has very robust short-circuit protection, preventing damage to devices or to the power supply itself in the event of a wiring mistake. A Digitrax booster set to HO scale actually produces 18 volts AC but the device still works fine. Here is a picture of my device:
AC power is fed into the 2-position terminal strip on the left. When power is applied the blue LED glows to show that the power is on. The AC power feeds the bridge rectifier which is at the back of the circuit board from the perspective of the viewer. The bridge rectifier sends 12 volt DC power to four voltage regulators which produce 12, 9, 5 and 3 volts DC power, respectively. The 6-position terminal block contains outputs for ground and these various voltages.
Each of the devices is attached to a heat sink to help reduce the chance of them overheating.
I tried hooking the burning building humidifier to the 5 volt and ground terminals and it works like a charm. I no longer need to have to fuss with the rechargeable power supply.