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This circuit uses an MC2830 to form a voice activated switch ( VOX ). A traditional VOX circuit is unable to distinguish between voice and noise in the incoming signal. In a noisy environment, the switch is often triggered by noise, or the activation sensitivity must be turned down. Voice Activated Switch Circuit Diagram:   This circuit overcomes this weakness. The switch is activated by voice level above the noise and not activated by background noise. This is done by utilizing the differences in voice and noise waveforms. Voice waveforms generally have a wide range of variation in amplitude, whereas noise waveforms are more stable. The sensitivity of the voice activation depends on the value of R6. The voice activation sensitivity is reduced from 3.0dB to 8.0dB above the noise if R6 changes from 14k to 7.0k .

This circuit passes frequencies in the 300Hz - 3.1kHz range, as present in human speech. The circuit consists of cascaded high-pass and low-pass filters, which together form a complete band-pass filter. One half of a TL072 dual op amp (IC1a) together with two capacitors and two resistors make up a second-order Sallen-Key high-pass filter. With the values shown, the cut-off frequency (3dB point) is around 300Hz. As the op amp is powered from a single supply rail, two 10kO resistors and a 10µF decoupling capacitor are used to bias the input (pin 5) to one-half supply rail voltage. Voice Bandwidth Filter Circuit Diagram   Voice Bandwidth Filter Circuit Diagram The output of IC1a is fed into the second half of the op amp (IC1b), also configured as a Sallen-Key filter. However, this time a low-pass function is performed, with a cut-off frequency of about 3.1kHz. The filter component values were chosen for Butterworth response characteristics, providing maximum pass-band flatness. Overal...

I designed this project with following Tools: Microsoft Voice Recognition SDK tool Kit Microsoft Visual Basic 6 Some sort of components for Control the Appliances In this Project i control Only 4 Devices which are depends on Human Voice Commands. e g if i want to turn on Fan Simply Say "FAN ON" and if you want to turn it off Simply Say "FAN OFF".Basically its totally depends on Voice Recognition ,When we say any thing the Microsoft Voice Recognition SDK tool kit convert it into TEXT and compare it with Predefined Voice Command List and the Output will be change according yo Over Voice. I Designed it to control the Devices which are connected to the PCs Parallel port later on i will use Serial or USB port for further..... Top Components Side View Top Components Side view with DB-25 Connector Bottom Solder Side View DB-25 Connector To get Complete Project in Working and Tested condition feel free to contact me or email me on mentioned email address in the ...