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Index 227

The low-speed single steady circuit

Published:2011/7/4 4:32:00 Author:Seven | Keyword: low-speed, single steady circuit

The low-speed single steady circuit
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The low-frequency astable circuit

Published:2011/7/4 4:33:00 Author:Seven | Keyword: low-frequency, astable circuit

The low-frequency astable circuit
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The key switch circuit

Published:2011/7/4 4:34:00 Author:Seven | Keyword: key switch

The key switch circuit
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The balcony burglarproof lamp

Published:2011/7/4 5:56:00 Author:Borg | Keyword: balcony burglarproof lamp

The balcony burglarproof lamp
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The cultural relic security alarm circuit of ND-2

Published:2011/7/4 19:42:00 Author:Borg | Keyword: cultural relic, security alarm

The cultural relic security alarm circuit of ND-2
The circuit is shown in Figure (b), which consists of the vibrating sensor, relay control circuit, alarm sound generating circuit, audio power amplifier circuit and AC step-down rectifier circuit, etc. It can be used in situations of the precious object security, storeroom, safe locker, vehicle and door/window anti-burglary, etc. ND-2 is a all-direction vibrating sensing module, in figure (a) is its function frame diagram. (View)

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The water boiling alarm circuit

Published:2011/7/4 19:52:00 Author:Borg | Keyword: water boiling alarm

The water boiling alarm circuit

This water boiling alarm circuit consists of 4 triodes, whose circuit is shown in the figure. In the figure, the transistors T2 and T3, resistor R2 and capacitor C,etc, compose the audio oscillator, the audio signal is output from the loudspeaker. The transistor T1, resistors R1 and W, the transistor knot be and Rt, etc, compose a switch circuit as the switch of the oscillator. Rt is the temperature sensing element, which is equal to the bias resistor of T1. Usually, Rt is reversely blocked, T1 is also blocked; when the temperature is rising up, the reversal resistance of Rt is falling down, the current leakage is rising up. (View)

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The gas leakage alarm

Published:2011/7/4 6:14:00 Author:Borg | Keyword: gas leakage alarm

The gas leakage alarm
The gas sensor can form a gas leakage wireless remote control alarm, when the gas leakage is over the content of the safety standard, the sensor is outputting a detecting signal, and the wireless emitter circuit is emitting alarm signal after the signal is amplified and processed. In the figure is the gas leakage wireless remote control alarm which consists of the gas sensor(QM-N10), when the gas leakage is over the regulated standard, the relay will pull in and get the working power supply of the emitter circuit through. The emitter circuit of the alarm has not been drawn in the figure. (View)

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The radar monitor language alarm

Published:2011/7/4 6:02:00 Author:Borg | Keyword: radar monitor, language alarm

The radar monitor language alarm
The circuit consists of the microwave sensing part TWH9248／TWH9249, single steady time delay circuit, language alarm circuit, FM emitter circuit and power supply circuit,etc. (View)

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The Smoking Ban and Fire Warning Board Circuit

Published:2011/7/4 6:20:00 Author:Borg | Keyword: Smoking Ban, Fire Warning

The Smoking Ban and Fire Warning Board Circuit
When someone walks past the valid range of the warning board, this circuit will make the sound of twang```no smoking, no fire . (View)

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sound and light of resistance furnace alarming circuit

Published:2011/7/4 0:17:00 Author:John | Keyword: resistance furnace

sound and light of resistance furnace alarming circuit
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Microwave radar automatic lamp circuit(4)(TWH9250)

Published:2011/7/1 1:14:00 Author:zj | Keyword: Microwave radar automatic lamp circuit(4)(TWH9250), TWH9250, LM7812

(a) Microwave radar automatic lamp circuit(4) (b) TWH9250 microwave module As the diagram shows,the annular antenna can use Φ1~3mm enameled wire to bend to circle andto connect to X,Y ports of the module. (View)

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The single key 555 dual steady switch circuit

Published:2011/7/3 20:48:00 Author:Borg | Keyword: single key, dual steady switch

The single key 555 dual steady switch circuit
In figure 1 is the circuit. When the circuit gets power, C1 makes 6-pin of IC(555) acquire a positive pulse, the 3-pin is outputting a low LEV, at the moment, there is no voltage on C2. By pressing the key of S, the 0 LEV is working on 2-pin of the IC, 3-pin is reversed in a high LEV, C2 is charged by R3. After S is released, C2 is charged to Vcc, both the 2-pin and 6-pin are offset to 1/2Vcc by R1 and R2, the high LEV of 3-pin remains the same. By pressing S again, the voltage on C2 makes the voltage on 6-pin of the IC higher than 2/3Vcc, and 3-pin is reversed in a low LEV. (View)