Human body induction lamp circuit design based on LM358 - Power Circuit - Circuit Diagram

The LM358 includes two independent, high-gain, internal-frequency-compensated dual op amps for single-supply operation with a wide supply voltage range. It is also suitable for dual-supply operation. Under recommended operating conditions, the supply current is The power supply voltage is independent. Its range of applications includes sense amplifiers, DC gain blocks, and all other single-supply op amps.

The LM358 is available in a packaged 8-lead dual in-line and patch package.

String 1 characteristics: String 2 internal frequency compensation string 9 DC voltage gain high (about 100dB) String 7 unit gain frequency bandwidth (about 1MHz) string 2 Power supply voltage range: single power supply (3-30V) Dual power supply (±1.5±15V) string 7 low power current, suitable for battery-powered string 9 low input bias current string 9 low input offset voltage and offset current string 4 common mode input voltage range, including Grounding string 3 differential mode input voltage range is wide, equal to the power supply voltage range string 3 output voltage swing is large (0 to Vcc-1.5V) string 5 pin position chart string 3 string string 8 string string 5 infrared detection alarm The string 7 can detect the infrared rays emitted by the human body. When a person enters the monitoring area of ​​the alarm, an alarm sound can be generated, which is suitable for burglar alarms in important places such as homes, offices, warehouses, and laboratories.

Working principle string 6 The circuit principle of the device is shown in Fig. 1. It consists of an infrared sensor, a signal amplifying circuit, a voltage comparator, a delay circuit, and an audible alarm circuit. When the infrared detecting sensor IC1 detects the infrared signal radiated from the front human body, the weak electric signal is output from the 2 pin of the IC1, and is amplified by the first-stage amplifying circuit through the triode VT1, and then input to the operational amplifier IC2 through C2 for high gain. Low noise amplification, at this time the signal output by the IC21 pin is strong enough. IC3 is used as the voltage comparator. Its 5th pin provides the reference voltage from R10 and VD1. When the signal voltage output from IC21 pin reaches the 6th pin of IC3, the voltages of the two input terminals are compared. At this time, the 7th pin of IC3 is from the original The high level goes low. IC4 is the alarm delay circuit, and R14 and C6 form a delay circuit, which takes about 1 minute. When IC3's 7 pin goes low, C6 discharges through VD2. At this time, IC4's pin 2 goes low. It compares with IC4's 3-pin reference voltage. When it is lower than its reference voltage, IC4's The 1 pin becomes high level, VT2 turns on, and the alarm BL energizes to sound an alarm. After the infrared signal of the human body disappears, the 7th pin of IC3 returns to the high level output, and VD2 is cut off at this time. Since the voltage across C6 cannot be abrupt, it is slowly charged to C6 through R14. When the voltage across C6 is higher than its reference voltage, the 1 pin of IC4 becomes low level for about 1 minute, that is, the alarm is continued for 1 minute. .

The power-on delay circuit consists of VT3, R20 and C8, and the time is also about 1 minute. Its setting is mainly to prevent the user from immediately alarming after starting the machine, so that the user has enough time to leave the monitoring site and prevent the power failure after the power failure. A false positive occurred while calling. String 4 The device is powered by 9-12V DC power supply, stepped down by T, full bridge U rectified, C10 filtered, and the detection circuit is powered by IC5 78L06. The device is used for both AC and DC, and automatically converts without interruption.

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