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A voice-activated trigger explain the principle Ceiling

2017-08-15 00:05  
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Next came a voice control trigger suction a top principle explanation. The principle of practical, combined with schematic diagram, please grasp well.As shown in figure: a two-stage amplifier based on a four operational amplifier LM324  integration provides a good gain enable pick-up up to four metres long. Third op-amp is configured as a level sensor of inverting terminal is the output of signal amplification and filtering can be used at the federal reserve, the second operational amplifier. Inverting input of the op-amp is given a reference voltage 3 from a potential divider consisting of 10 k resistor and 4.7 k presets. 100 ohm resistor in series with the voltage divider to ensure potential noise of mis trigger circuit. Therefore, by adjusting the preset a can control circuit sensitivity (threshold). The sensitivity control which helps to refuse any external surplus voice may be picked up by the amplifier. Level sensor output of the square pulse is used to trigger a trigger. Mf capacitor connected to the supply of 100 also helps to avoid noise. Because the circuit work at 4.5 v, it can easily be incorporated in the digital circuit. FIG. (b) display circuit can be used to control the direction of the dc motor. Four NPN transistor circuit. Transistor T1 and T4 have their base of bundled together, they also turned on when the q output logic 1. T2 and T3 are same output logic 1 when asked. Therefore the current through the motor to change direction when a trigger switch. Filters are connected in a circuit and transferred to different wavelengths of the audio frequency controlling multiple devices will lead to the same circuit. For example, a high frequency sound, such as whistle) can open the device 1 and a low frequency sound (e.g., applause) can control device 2. A well regulated supply circuit is recommended for normal work, because a unregulated supply noise leads to pulse in supply rails when circuit changes state (especially when the load is connected to the circuit). These pulses can choose sensitive amplifier that will lead to circuit switching state again, leading to motor noise in a rowing boat.


Sound Controlled Filp Flop

Sound Controlled Filp Flop

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