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Simplified scheme of vibration sensor using a CA3094

2014-11-25 23:32  
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The arrival of people who are not invited are not unpredictable and increasingly sophisticated skills as well. But the presence of these uninvited guests can not without causing vibrations at least not enough to be used as a generator of this vibration sensors. Vibration sensor circuit is made very simple and it is possible to use a battery as a source of electrical power. In addition to a very simple design, this circuit is very small also uses an electrical current. Sensor for circuit design is taken from the components available. Sensor is only a speaker with a 2-inch diameter. Working principle is very simple reverse the process of working daari regular speakers work process. Speaker if the terminals receive the signal as shown on the left 1 will produce output vibration on the membrane and cause the formation of sound. Here is a picture working principle:

Diagram blog Simplified scheme of vibration sensor using a CA30941 Simplified scheme of vibration sensor using a CA3094

When speakers are used as sensors, membrane coating on the speaker serves as a vibration detector. When there is vibration coming to the membrane, the membrane will also vibrate. Membrane vibration will cause the membrane loops will move relative to the fixed magnetic core and generate electrical signals. Restrictions on the membrane resonance region should be regulated so that the membrane will not catch the vibrations with frekunsi not cool. In this project, the membrane was made in such a way that only the response at low frequencies because the vibration step / objects at low frequencies. To reduce the response to the speakers using the additional material that absorbs the signal / high-frequency vibrations such as giving a sponge layer in the area around the membrane. These additions must be done carefully so that speakers can still respond with a good vibration. The following is a schematic drawing:

Simplified scheme of vibration sensor using a CA30941 Simplified scheme of vibration sensor using a CA3094

To strengthen the signal generated from the speakers used opamp CA3094. Basic selection of this transistor is that the signal generated by the speaker and the current amplitude is very weak. To cope with this by simply using the opamp should be used with a character opamp transconductance amplifier. This advantage is ic opamp gain can be controlled so that the CA3904 is usually described as programmable transconductance amplifier. In the CA3094 output fed to the circuit that regulates long monostabil bell sounds. When there is vibration on the membrane of the speakers will produce a signal with very small amplitude. This signal is reinforced, causing the voltage at pin 1 on the logic ’1 ‘. This condition causes feedback through the transistor 2N4403 and 1N914 diodes. Because the 2N4403 transistor ‘ON’ and produces a feedback voltage to the base of 2N4401 transistor rises and causes of this ‘ON’ is then also activate the monostable circuit. By ‘it’ ON ‘the 2N4401 transistor is a current flowing through the bell and 2N4401 transistors. This condition will produce until the bell rang again in monostabil circuit reset condition.

Please note: For placement of the sensor position and the position affects the sensitivity of this circuit. To extend the working area on the microphone can be placed in PVC tubes filled with materials that have been given and then the PVC pipe was planted in the ground. The longer the PVC pipe planted a better job of this sensor. The length of PVC pipe that is used about 1 meter. PVC pipe is then generated vibrations will move / walk through the material in PVC pipe and finally reaches the surface of the sensor project.

source : tutorial-elektronika.blogspot.com

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