A battery component replacement circuit for use in a model railroad application is disclosed. The circuit according to an embodiment of the invention has a series of capacitors connected between positive and negative terminals which supply power for charging the capacitors and which are connected to a load, namely a sound driver and associated processor. A series of diodes is connected in parallel with the series of capacitors also across the terminals. In an alternate embodiment the series of diodes is replaced with a series of resistors.