2N2905A PNP Small Signal General Purpose Amplifier
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Product review & video
hi welcome to our SD Academy I'm Bob Duhamel and today we are going to talk about small signal amplifiers be sure to look in the description below for your reading assignment and let's get started so let's start with a microphone and our goal is to amplify the tiny signal that comes from this microphone and eventually put that signal into a power amplifier that can run a loudspeaker so what we have is basically a public address system or PA system and obviously it works on audio frequencies this could just as easily be a radio receiving antenna and then it would work at radio frequencies but a PA system is a good circuit to analyze to understand how basic amplifiers work so let's take a look at this microphone and see what it does and see what we have to do to make the signal useful if we imagine my pin is a microphone inside the head as a plastic diaphragm and attached to that as a spo
