Blacksmith Sound Effects Circuit This blacksmith circuit comes with a 9-volt speaker, a one-minute audio chip, and a 9-volt battery snap with a micro switch. There is no noticeable overlap, and it includes a variety of blacksmith sound effects. Check out the video on this page to hear the realistic sound track. The circuit is pre-assembled, just attach a 9-volt battery and bring your blacksmith scenes to life. This chip is perfect for scale models, model train layouts, and hobby dioramas. Upgrade to a medium, large, or jumbo speaker for your larger projects. This blacksmith makes a nice, busy forge. Speaker Sizes (click to enlarge) "What do I need to run this circuit?" 5-12 volt battery / regulated adapter Your own battery, or for 9 volt get our 9 volt battery snap/switch or plug in 12 volt get our 12 volt regulated adapter Your own AC/DC or DCC supply: 12-19V 12-19 volt Universal AC/DC/DCC circuit is already set up with a regulator/resistor and rectifier for your power supply