05-05-2014, 07:04 PM
what is the working principle of listening bug
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principle of a listening bug using ic 741
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what is the working principle of listening bug
18-09-2017, 09:44 PM
i feed to know about listing bud full information and application and result
19-09-2017, 01:06 PM
The input sound collected by the condenser microphone with high sensitivity is supplied to the listening error circuit and you get an adjustable sound gain at its output that improves the sound quality for obvious reasons. Now, people can hear everything without problems without risk of interruption and will not miss any conversation. For the effective implementation of the circuit, it is recommended to use a 6V (4X1.5V) battery.
Circuit Description of the listening error Circuit using the LM386 operational amplifier:-
As stated in the previous paragraph, there is no vital component in this circuit of Listening errors as a main element. It incorporates ideas of using simple discrete components to perform amplification operations and thus improve sound quality. Figure 1 shows the circuit diagram of the Spy ear project. At the input terminal, a transistor BC547 (T1) and a signal amplifier circuit connected to T1 can be seen. At that point also called the preamplifier phase, the sound signal picked up by the condenser microphone (MIC1) is amplified to a certain level by the combination of T1 and a few related components. Here the resistor R5 and the capacitor C3 combined a decoupling network which supplies the preamplifier phase with a regular supply voltage. In the next phase, said signal is pushed through capacitor C2 (100nF) and volume control VR1 (10 kilo-ohm log) as input to pin 3 of IC LM386N (IC1).
![[Image: listening-bug-circuit.jpg?resize=1024%2C709&ssl=1]](https://i0.wp.com/bestengineeringprojects.com/wp-content/uploads/2017/09/listening-bug-circuit.jpg?resize=1024%2C709&ssl=1)
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