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Rotary phone: Microphone hardware

Rotary phone: Microphone hardware - Raspberry Pi教程

课程: Raspberry Pi Weekly

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Rotary phone: Microphone hardware

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- I found an old rotary telephone. It's delightfully mechanical with a dial, bell, and handset. I couldn't resist opening it up, and once inside, couldn't resist adding a Raspberry Pi. In previous episodes, we connected the Raspberry Pi to the phone's switches, speaker, and ringer. Finally, it's time to record sound from the telephone microphone. Since the Raspberry Pi doesn't have audio input, this is more complex than you might think. In this first part of a two-part series, I'll discuss the hardware you need to add. Next week, I'll talk about the software to drive that hardware. Hi, I'm Mark Niemann-Ross, and welcome to this week's edition of "Raspberry Pi Weekly." Every week, we explore the Raspberry Pi and share useful tips. Let's start from the telephone and work towards the Raspberry Pi. The first thing I found was that the old style telephones use a carbon microphone, which require a support circuit, DC…

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