Patent ID: 8779273
Filing Date: 2014-07-15
Classification: G10H

Abstract:
1. A power supply device for supplying power to a pickup device for a guitar, the pickup device including a battery casing detachably provided with a battery for supplying power to a pickup unit and a TRS connector configured such that signal lines are connected thereto, wherein a power supply line of the battery is connected in parallel to two of the signal lines between the battery casing and the TRS connector; the power supply device comprising: a pickup connector connected to the TRS connector; an external device connector connected to an external device; a step-down transformer configured to step down commercial power and supply the stepped-down power to the pickup device via the TRS connector; and a switching unit disposed at output terminals of the first and second step-down transformers and configured to supply any one of output powers to the pickup connector, wherein the step-down transformer comprises a first step-down transformer for stepping down external commercial power and a second step-down transformer for stepping down power supplied from a phantom power supply.