A "step-down transformer" allows a device that requires a low voltage power supply to operate from a higher voltage. The transformer takes in the high voltage at a low current and puts out a low voltage at a high current.
Your Mailbu-brand landscape lights run on 12VAC, but you plug them into the 110 VAC line. Your doorbell doesn't need batteries. It runs on 110 VAC, converted to 12VAC.
Pieces of electronic equipment (like T.V.s and radios) use a step down transformer to reduce the mains voltage from 230 V to the operating voltage of the electronics.
Dyco Electronics is a medium sized corporation with a large, modern plant. Our step down transformer production capabilities include processes that assure that we are quick and efficient. Our customer service staff will respond to your inquiries promptly and courteously. Our materials, management and procurement personnel work hard to insure that our costs are competitive.