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Could anyone point me to a good, or even awesome circuit schematic using the 2n2222a transistor in an audio amp for a piezo buzzer disk contact microphone? I intend to use it to capture and listen to human speech.

F.

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closed as too broad by Elliot Alderson, Blup1980, Kevin Reid, laptop2d, RoyC Jan 12 at 15:54

Please edit the question to limit it to a specific problem with enough detail to identify an adequate answer. Avoid asking multiple distinct questions at once. See the How to Ask page for help clarifying this question. If this question can be reworded to fit the rules in the help center, please edit the question.

  • \$\begingroup\$ What are the properties of the piezo buzzer disk contact microphone? Rout, Cout, resonances, bandwidth, etc. \$\endgroup\$ – analogsystemsrf Jan 5 at 5:52
  • \$\begingroup\$ You mean like beep when anyone talks? using the piezo as a mic and a beeper? How novel. Same idea can be used as a motion detector for security goods with a ball bearing inside. \$\endgroup\$ – Sunnyskyguy EE75 Jan 5 at 8:58
  • \$\begingroup\$ um, aren't you restricting yourself a little much? wouldn't it be much easier to just build a piezo microphone amplifier with the components of choice (and glue a 2N222A on it when it's done to have the 2n2222a integrated there)? \$\endgroup\$ – Marcus Müller Jan 5 at 9:04
  • \$\begingroup\$ @TonyEErocketscientist like the man Fletch said, it’s all ball bearings these days... \$\endgroup\$ – Francis from ResponseBase Jan 5 at 19:43
  • \$\begingroup\$ I pulled the buzzer from a household fire, and have no specs for it. \$\endgroup\$ – Francis from ResponseBase Jan 5 at 19:45