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Snoring alarm circuit

2016-02-19 16:10  
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snore almThis article shows that snoring alarm circuit. To better grasp this principle, you can combine text understandable that circuit. For a more thorough grasp of this principle, you can also learn about the importance of the circuit components, such as: BD131, TIP31C , TL071 , 1N4001, 1N4148. The idea behind this snore alarm, just stir snorers, rather than the whole family. Waking the Sleeper, vibration is used instead of an audible alarm. Vibration is a small car, live in a small 35 mm film case, you can put a sleeper mattresses and pillows. This circuit has a level control and peak display indicator, a variable trigger threshold and trigger instructions. It is designed to lead to snoring alarm, the default period by VR2 adjustable. It is designed not to activate a short noise, such as slamming doors, car speakers, but rather wait for a set delay before triggering. Snoring is a continuous one, after all, a good few seconds, so the delay can be set before the trigger threshold control. The size is determined by the setting VR1 snoring, so for snorers VR1 will be refunded, advanced quiet snorers. Once activated, the vibrations are relying gently wake snorers. I recommend using a small DC motor in 35 mm film case a 3.5 mm plug to connect the main unit. This circuit can be divided into four parts, as shown in the following diagram. From left to right we enter the sensor, which is inserted into a small microphone ecm. A low-pass filter and amplifier based on op amp IC1, filter out high frequency noise. Sound amplification and then converted into direct current by the rectifier via a precision op amp IC2. Then the filtered DC component and activation delay circuit must occur a few seconds. The delay circuit using op amp IC3 as a level shifter and compared the charge in the capacitor C8 set its reference input threshold control, VR2. Once the threshold is reached, which triggers the timer and the motor drive. Motor operation the delay is fixed, but can be by using a variable potentiometer R15. Sound is received by the microphone and amplified with IC1. Electret microphone insert (ecm) for my prototype, but a dynamic microphone is inserted Impedance 200 to 1 k may be used. If a dynamic microphone, omit R1. IC1 functions as an active filter to reduce high frequency gain. In the low-frequency gain is 47, began to fall more than 1 khz. VR1 is to control the water level at this stage. Operational amplifier is a precision rectifier IC2. It has an improved signal phase obtained R7 / R6 level, 1 n4148 diode in the feedback loop the audio signal is now converted into positive half-wave rectified signal. R4, R5 and C2 non-inverting input of the amplifier bias and IC2 IC1 half the supply voltage. Peak signal level through C5 and R8 LED 1 provides a visual display of the peak. LED1 will light up constantly but flash response peaking voice. VR1 is adjusted, LED1 blinks every snoring. As a Snoring is an interrupt signal, the circuit must only be triggered after someone started snoring. If there is no delay, then the circuit will cause any background noise. Despite a certain degree of high-frequency grinding mill employed in this snore alarm, all sounds including the fundamental frequency, plus a large number of harmonics. Therefore, car speakers, or a car door opened in the middle of the night can trigger an alarm, requiring an input delay. Enter the delay is caused by C8 and R12. Half-wave rectified signal from IC2 are again filtered, to slowly price C8, 33 u electrolytic capacitors. C8 will only accept an input signal is present, i.e., such as loud snoring. No input signal, the R12 and R11 C8 discharges. Signal is further amended by D2 and R9 R10 provides a slight positive bias will D2, 1 n4148 diode into conduction. This also precharges C8 few tenths of volts no signal. Providing a delay, IC3 op amp as a variable level sensor. VR2 are used as a threshold value control, so the charge must be equal to the voltage at the pin C8 op amp 3, VR2 set. When this happens, the circuit will trigger the displayed LED2. Note that the output is generally higher IC3, change low output trigger. If a capacitor is fixed by a direct current charging and the charging time can be calculated which, however, when the charging current, this circuit is not fixed, and to provide intermittent noise source (snoring) and calculation becomes difficult. The easiest option is to experiment and displayed on the principles and values ??that my prototype chopping board provides 2-10 seconds delay value. Finally, the ignition phase. The output of the delay circuit is normally high, a change, low detection term snoring. This is the correct polarity trigger a 555 timer, IC4 is configured as a one-shot. The delay is set by the R15 and C9 and is calculated as 1.1 xR15 xC9. This is 24.2 seconds, the displayed value. R15 can be variable if necessary, 4 cans will provide an output m7 is 114 seconds. 555 timer output load can supply 200 ma, however, Q1 and Q2 form a Darlington emitter follower and can source 738. As two transistors are completely in, all the power dissipated in the load, and they do not need heatsinks.


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Parts List:

C2,C1: 10u (2)
C3: 10n CAP (1)
C4: 4u7 (1)
C5: 100u (1)
C6: 220u (1)
C7: 470u (1)
C8: 33u (1)
C9: 22u (1)
D1,D2: 1N4148 DIODE (2)
D3,D4: 1N4001 DIODE (2)
LED1 Red LED (1)
LED2 Red (or any colour)(1)
IC1,2,3: 741,TL071 or 1 quad opamp, i.e TL084 (3)
IC4: 555 (1)
Q1: 2N3053 (1)
Q2: BD131 or TIP31C (1)
R1,R6,R16: 2k2 RESISTOR (3)
R2,R8: 1k RESISTOR (2)
R3: 47k RESISTOR (1)
R5,R4: 22k RESISTOR (2)
R7,R9: 100k RESISTOR (2)
R10,R12: 10k RESISTOR (2)
R11: 220k RESISTOR (1)
R13: 4k7 RESISTOR (1)
R14: 2k7 RESISTOR (1)
R15: 1M RESISTOR (1)
VR1,VR2: 10k RESISTOR (2)

 


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