A traditional residential doorbell chime gets its electrical power from a dedicated low-voltage doorbell transformer that is typically mounted on a junction box near your main electrical service panel, basement ceiling, or utility closet. This transformer steps down standard 120-volt household alternating current (AC) power from your electrical distribution grid down to a safe low voltage of 16 to 24 volts AC. This low voltage travels through thin wires to the outdoor push button and indoor chime box, completing the circuit when the button is pressed. You can troubleshoot electrical power safely by testing transformer output terminals with a digital multimeter set to AC voltage. You can verify that your corrective action is successful when confirming steady 16 to 24 volts AC output ensures your doorbell chime receives continuous, reliable power.
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