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My dad purchased a lavalier microphone (one with a 3.5 mm connector) for business meetings and was unaware that it needed a power supply. Could a simple 3.5 mm to usb converter power it via USB? If not are there any cheap alternatives which could power it and allow it to plug directly into the computer?

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    We would need to know more about your microphone, to understand what it needs. – Rory Alsop Aug 19 at 16:03
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If that 3.5mm jack is meant for a microphone, it might already offer the possibility of powering an electret microphone . Or you can build a battery supply adapter (9V battery and even 2 x AA alkalines) inside a small box and insert it between microphone and adapter.

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