A circuit diagram of a danger zone warning device
The circuit functions as a danger zone warning system incorporating a regulator circuit, a pyroelectric infrared detection trigger circuit, an electronic switching circuit, and audio circuits. The regulator circuit includes a three-terminal regulator integrated circuit (IC2), a resistor (R3), a zener diode (VS), and filter capacitors (C1, C2). The pyroelectric infrared detection circuit is activated by a pyroelectric infrared detection module (IC1), transistors (V1, V2), resistors (R1, R2), and a potentiometer (RP). The electronic switching circuit is composed of an electronic switch IC (IC5), resistors (R9, R10), and a capacitor (C8). The audio power amplifier circuit consists of a power amplifier integrated circuit (IC4), resistors (R6 to R8), capacitors (C4 to C7), and a speaker (BL). The low-frequency oscillator circuit is built using a time-base integrated circuit (IC6), resistors (R11, R12), and capacitors (C9, C10). The flash drive circuit is formed by transistors (V3), resistors (R13 to R15), field-effect transistors (VF1, VF2), and indicators (HL1, HL2). The circuit operates from a +12V supply voltage for IC4, IC5, and V2; another path provides +5V to IC1 through the regulator IC2, which generates a +3V supply for IC3 via R3. IC1 incorporates a high-sensitivity infrared sensor, a high-gain low-noise amplifier, an automatic temperature compensation circuit, a signal comparison circuit, a delay circuit, and a high and low drive circuit. In a static state (when no one is in the detection area), pin 1 of IC1 outputs low, pin 2 outputs high, and both transistors V1 and V2 are inactive, resulting in the circuit being off and no sound from the speaker. The electronic switching circuit remains in the OFF state, and the low-frequency oscillator is not powered, causing HL1 and HL2 to remain off. When a person enters the detection zone, pin 1 of IC1 switches from low to high, activating V1 and triggering IC3 to produce an audio signal output, which is amplified by IC4 to drive the speaker BL, issuing a warning sound. Simultaneously, pin 2 of IC1 goes low, turning on V2, which activates IC5, powering the low-frequency oscillator. IC6 outputs a 2Hz low-frequency pulse signal, causing HL1 and HL2 to flash alternately (HL1 lights when VFI is on, and H12 lights when V3 and VF2 are on). Component selection includes 1/4W carbon film or metal film resistors for R1 to R7 and R9 to R15, with R8 as a 1/2W metal film resistor. RP is a small potentiometer or variable resistor. Capacitors C1, C2, C4 to C6, C8, and C9 are selected with a voltage rating of 10V or more as small electrolytic capacitors; C3, C7, and C10 are polyester, monolithic, or CBB capacitors. Transistor selections include V1 as a 59014 or 3DG9014 silicon NPN transistor, and V2 and V3 as 59012 or 3DG9012 silicon PNP transistors. VF1 and VF2 are chosen as 2SK1530 or IRF1390 field-effect transistors. IC1 is the HN911L pyroelectric infrared detection module (10m detection distance, 100° azimuth angle); IC2 is the LM7805 or 78L05 three-terminal integrated voltage regulator; IC3 is a reservoir danger signal IC; IC4 is the TDA2002 audio power amplifier IC; IC5 is the TWH8778 electronic switch IC; IC6 is the NE555 time-base integrated circuit. The speaker BL is an 8Ω (or 4Ω), 3 to 5W electric speaker, while HL1 and HL2 are small 12V vehicle bulbs.
The described circuit effectively integrates various components to create a comprehensive danger zone warning system. The regulator circuit ensures stable voltage levels for the various integrated circuits, while the pyroelectric infrared detection module provides real-time monitoring of the detection area. When motion is detected, the system activates both audio warnings and visual alerts through the flashing indicators, enhancing situational awareness. The electronic switch allows for seamless integration of different circuit functions, ensuring that the system operates efficiently. The low-frequency oscillator adds an additional layer of alert by providing a rhythmic visual signal, which can be critical in attracting attention. The careful selection of components ensures reliability and performance, making this circuit suitable for various applications where safety and alertness are paramount. Circuit works The danger zone warning circuit from the regulator circuit, the pyroelectric infrared detection trigger circuit, electronic switching circuit, voice circuits, aud io power amplifier, low frequency oscillator and a flash drive circuit and other components, as shown in FIG. Regulator circuit consists of three terminal regulator integrated circuit IC2, resistor R3, zener diode VS and filter capacitor C1, C2 components.
Pyroelectric infrared detection circuit is triggered by a pyroelectric infrared detection module IC1, transistor V1, V2, resistors R1, R2 and potentiometer RP. Electronic switching circuit from the electronic switch IC IC5, resistors R9, R10 and capacitor C8 composition.
Audio power amplifier circuit from the power amplifier integrated circuit IC4, resistors R6 ~ R8, capacitor C4 ~ C7 and speaker BL composition. Low-frequency oscillator circuit by the time-base integrated circuit IC6, resistors R11, R12 and capacitor C9, C10 and other components.
Flash drive circuit by the transistor V3, resistor R13 ~ R15, field effect transistor VF1, VF2 and indicator HL1, HL2 composition. + 12V supply voltage direct way IC4, IC5 and V2; another path IC2 regulator to + 5V, supply IC1; there all the way through R3 limiting, VS regulator generates + 3V voltage supply IC3.
IC1 internally by high sensitivity infrared sensor, high-gain low-noise amplifier, automatic temperature compensation circuit, signal comparison discriminating circuit, delay circuit, high and low drive circuit. In the static (that no one enters the detection area), 1 foot IC1 output low, the output of 2 feet high, the transistor V1 and V2 are closed, Wu made the circuit does not work, BL does not sound speakers; electronic switching circuit is in the OFF off state, the low-frequency oscillator without the power supply instead of working, HL1 and HL2 does not emit light.
When someone enters the detection zone IC1, IC1 pin 1 from low to high, so that V1 conduction, IC3 triggered by the work, its output voice signal (O/P side) output by IC4 after amplification, the driving speaker BL hazard, do not close language warning sound. At the same time, IC1 2 feet from the high to low, so that V2 conduction, IC5 internal electronic switch is turned on, the power supply to obtain low-frequency oscillator oscillates work, 3 feet from IC6 output operating frequency 2Hz low frequency pulse signal, so HL1 and HL2 flash alternately (when the signal is positive pulse, VFI is turned on, HL1 is lit: when the signal is negative pulse, V3 conduction and VF2, VF1 off, H12 is lit) issuing reminders flash signal.
Component selection R1 ~ R7, R9 ~ R15 choose 1/4W carbon film resistors or metal film resistors; R8 selection 1/2W metal film resistors. RP use of small potentiometer or variable resistor. C1, C2, C4 ~ C6, C8, and C9 are selected voltage is 10V or more small electrolytic capacitors; C3, C7 and C10 use polyester capacitors, monolithic capacitors or CBB capacitor.
V1 selects 59014 or 3DG9014 silicon NPN transistor; V2 and V3 selection 59012 or 3DG9012 silicon PNP transistors. VF1 and VF2 selection 2SK1530 or IRF1390 field effect transistor. IC1 selects HN911L type pyroelectric infrared detection module (detection distance of 10m, the azimuth angle of 100 ); IC2 selected type LM7805 or 78L05 type three-terminal integrated voltage regulator; IC3 selected within the reservoir dangerous, do not close.
language IC; IC4 type selection TDA2002 audio power amplifier integrated circuits; IC5 selected TWH8778 electronic switch IC; IC6 NE555 type used when the base integrated circuit. BL choose 8 (or 4 ), 3 ~ 5W electric speaker. HL1 and HL2 small selection of vehicles with 12V bulb.
The described circuit effectively integrates various components to create a comprehensive danger zone warning system. The regulator circuit ensures stable voltage levels for the various integrated circuits, while the pyroelectric infrared detection module provides real-time monitoring of the detection area. When motion is detected, the system activates both audio warnings and visual alerts through the flashing indicators, enhancing situational awareness. The electronic switch allows for seamless integration of different circuit functions, ensuring that the system operates efficiently. The low-frequency oscillator adds an additional layer of alert by providing a rhythmic visual signal, which can be critical in attracting attention. The careful selection of components ensures reliability and performance, making this circuit suitable for various applications where safety and alertness are paramount. Circuit works The danger zone warning circuit from the regulator circuit, the pyroelectric infrared detection trigger circuit, electronic switching circuit, voice circuits, aud io power amplifier, low frequency oscillator and a flash drive circuit and other components, as shown in FIG. Regulator circuit consists of three terminal regulator integrated circuit IC2, resistor R3, zener diode VS and filter capacitor C1, C2 components.
Pyroelectric infrared detection circuit is triggered by a pyroelectric infrared detection module IC1, transistor V1, V2, resistors R1, R2 and potentiometer RP. Electronic switching circuit from the electronic switch IC IC5, resistors R9, R10 and capacitor C8 composition.
Audio power amplifier circuit from the power amplifier integrated circuit IC4, resistors R6 ~ R8, capacitor C4 ~ C7 and speaker BL composition. Low-frequency oscillator circuit by the time-base integrated circuit IC6, resistors R11, R12 and capacitor C9, C10 and other components.
Flash drive circuit by the transistor V3, resistor R13 ~ R15, field effect transistor VF1, VF2 and indicator HL1, HL2 composition. + 12V supply voltage direct way IC4, IC5 and V2; another path IC2 regulator to + 5V, supply IC1; there all the way through R3 limiting, VS regulator generates + 3V voltage supply IC3.
IC1 internally by high sensitivity infrared sensor, high-gain low-noise amplifier, automatic temperature compensation circuit, signal comparison discriminating circuit, delay circuit, high and low drive circuit. In the static (that no one enters the detection area), 1 foot IC1 output low, the output of 2 feet high, the transistor V1 and V2 are closed, Wu made the circuit does not work, BL does not sound speakers; electronic switching circuit is in the OFF off state, the low-frequency oscillator without the power supply instead of working, HL1 and HL2 does not emit light.
When someone enters the detection zone IC1, IC1 pin 1 from low to high, so that V1 conduction, IC3 triggered by the work, its output voice signal (O/P side) output by IC4 after amplification, the driving speaker BL hazard, do not close language warning sound. At the same time, IC1 2 feet from the high to low, so that V2 conduction, IC5 internal electronic switch is turned on, the power supply to obtain low-frequency oscillator oscillates work, 3 feet from IC6 output operating frequency 2Hz low frequency pulse signal, so HL1 and HL2 flash alternately (when the signal is positive pulse, VFI is turned on, HL1 is lit: when the signal is negative pulse, V3 conduction and VF2, VF1 off, H12 is lit) issuing reminders flash signal.
Component selection R1 ~ R7, R9 ~ R15 choose 1/4W carbon film resistors or metal film resistors; R8 selection 1/2W metal film resistors. RP use of small potentiometer or variable resistor. C1, C2, C4 ~ C6, C8, and C9 are selected voltage is 10V or more small electrolytic capacitors; C3, C7 and C10 use polyester capacitors, monolithic capacitors or CBB capacitor.
V1 selects 59014 or 3DG9014 silicon NPN transistor; V2 and V3 selection 59012 or 3DG9012 silicon PNP transistors. VF1 and VF2 selection 2SK1530 or IRF1390 field effect transistor. IC1 selects HN911L type pyroelectric infrared detection module (detection distance of 10m, the azimuth angle of 100 ); IC2 selected type LM7805 or 78L05 type three-terminal integrated voltage regulator; IC3 selected within the reservoir dangerous, do not close.
language IC; IC4 type selection TDA2002 audio power amplifier integrated circuits; IC5 selected TWH8778 electronic switch IC; IC6 NE555 type used when the base integrated circuit. BL choose 8 (or 4 ), 3 ~ 5W electric speaker. HL1 and HL2 small selection of vehicles with 12V bulb.
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