555 aphonia throat alternative device circuit

Published:2011/5/25 1:02:00 Author:TaoXi | Keyword: aphonia, throat, alternative device | From:SeekIC

The IC2(uA741) is designed as the voice amplifier, the amplification number depends on the value of RP2/R3, the maximum is 1000 times. The microphone picks up the throat voice and this throat voice is amplified by the IC2, then adds to VT1. The tone generator is composed of the IC1(555) and RP1, C1, C2, it's output pulse (pin-3) is changed into the triangular wave by C2 and RP1, so it produces the modulation to 555 oscillator to drive the speaker to send out the variable-tones sound waves. This device also can be used in the applications of analog dubbing and the analog tone voice.



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