Control Circuit

Touch Multi-channel Electric Switch(CD4017,CD4511,CD4518) Circuit

Published:2011/7/22 7:47:00 Author:Sue | Keyword: Touch, Multi-channel, Electric Switch

The touch electric switch has simple structure, reliable working state, integrated circuit and low cost. It has 20 channels to choose from. As seen in the figure, the circuituses a double digit monitor for channel display. The circuit consists of touch signal input circuit, control pulse forming circuit, channel selection circuit, channel coding and display circuit.   (View)

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The automobile storage battery burglarproof alarm

Published:2011/7/22 21:06:00 Author:qqtang | Keyword: storage battery, burglarproof alarm

　　Here is to introduce the automobile storage battery burglarproof alarm, which can emitter signal when the output wire of the battery is cut off, it can be used in the burglarproof alarm of cars and motors.The working principle of the circuitThe automobile storage battery burglarproof alarm consists of the detection control circuit and alarm circuit, see as figure 7-112. The detection circuit consists of the resistors R1-R5, regulated diode VS and transistors V1-V3.The alarm circuit consists of the audio integrated circuit IC, resistor R6 and loudspeaker BL.   (View)

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School Bells Analog Circuit

Published:2011/7/16 7:15:00 Author:Sue | Keyword: School Bells, Analog

T1,T2 will compose oscillate circuit. The signal will be coupled to T3 through the capacitor C3, which will be sent to the loud speaker after the signal is amplified. The circuit's T3's right terminal is connected to a normally open contactor of the relay. When J1-1 is connected, the power will charge C4. Then J1-1 is disconnected, C4 will be discharged through Y,T3. Discharging T3,C4 will be equal to a power supply so a weakening bell will be heard. The integrated circuit 555 will compose oscillate circuit with a period of about 1s. If its pin 3 is high level, the current will charge C1 through R1. When the potential of pin2, 6 is higher than 2/3Vcc, pin 3 has low level. C1 will then be charged through R1, and potential of pin 2,6 will be lower. When it is lower than 2/3Vcc, pin 3 has high level again. By controlling J's connection and disconnection, the interval of the bell can be controlled. When the sound from the loud speaker is good, the loud speaker can be moved. Then use a wire to short, and R5 will output U0. U0 will be sent to the loud speaker to drive the high tone loud speaker to make a loud and vivid sound. R6 can choose from 68-200Ω. The larger R6 is, the longer the aftersound is. R2,C2 are decided by the tone.   (View)

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The automobile burglarproof alarm (3)

Published:2011/7/23 3:30:00 Author:qqtang | Keyword: burglarproof alarm

The working principle of the circuit The burglarproof alarm circuit consists of the time-based integrated circuit IC, high power switch tube V, switch S2, time delay capacitor C and resistors R1-R4, see as figure 7-81. Sl(Sla and Slb) is the igniting switch (car lock switch), GB is the storage battery of the car, R4 is the additional current limit resistor of the igniting coil.When the car starts normally, the switch S2 is at the point of b, the burglarproof circuit is not working.   (View)

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The automobile burglarproof alarm (4)

Published:2011/7/23 3:36:00 Author:qqtang | Keyword: burglarproof alarm

The working principle of the circuit The burglarproof alarm circuit consists of the trigger control circuit and sound alarm circuit, see as figure 7-82. The trigger control circuit consists of the igniting switch S1, alarm control switch S2, resistors R3-R5, capacitors of C2 and C3, regulated diode VS, diodes of VD1 and VD2, transistors of V3 and V4. The sound alarm circuit consists of the resistor R1, capacitor C1, thyristor VT, transistors of V1 and V2, audio circuit IC and loudspeaker BL.   (View)

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The ultrasonic back-up crashproof alarm (1)

Published:2011/7/22 22:36:00 Author:qqtang | Keyword: ultrasonic, crashproof alarm

Here is to introduce an ultrasonic back-up crashproof alarm which is installed in the tail of the car, it detects and alarms with the reflected ultrasonic of the obstacle behind the car, when it has detected the obstacle in the effective range, it will remind the drive.The working principle of the circuit The ultrasonic back-up crashproof alarm consists of the ultrasonic oscillator, ultrasonic emitter/receiver control circuit and acousto-optic alarm circuit, see as figure 7-107.   (View)

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The automobile burglarproof alarm (5)

Published:2011/7/23 3:47:00 Author:qqtang | Keyword: burglarproof alarm

The working principle of the circuitThe burglarproof alarm circuit consists of the sound control circuit, cutting off trigger/self-lock switch circuit, regulated circuit and alarm circuit, see as figure 7-83. The sound control circuit consists of the microphone BM, piezoelectric pottery BC, resistors R1-R5, potentiometers RP1-RP4, capacitors C1-C5, transistors V1-V3 and the FET VF. The cutting off trigger/self-lock switch circuit consists of the resistor RIO, short alarm line W, relay K and thyristor (VT1, TV2).   (View)

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The automobile multi-function alarm (3)

Published:2011/7/23 3:11:00 Author:qqtang | Keyword: multi-function alarm

The working principle of the circuitThe automobile multi-function alarm circuit consists of the regulator circuit, storage battery voltage detection circuit, water tank level detection circuit, car door closeing state detection circuit, oil volume detection circuit, alcohol density detection circuit, LED indicator circuit and sound alarm circuit, see as figure 7-99. The regulator circuit consists of the current limit resistor R1, regulator diode VS1 and filter capacitors of C1 and C2.   (View)

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The automobile multi-function alarm

Published:2011/7/23 3:04:00 Author:qqtang | Keyword: multi-function alarm

The working principle of the circuitThe automobile multi-function alarm circuit consists of the detection circuit, trigger circuit, voice alarm circuit and control executing circuit, see as figure 7-100. The detection circuit consists of the control terminal ALC (A is located in the water tank as the water level detection pole; B is located in the general pump liquid as the brake liquid level detecting pole; C is located in the spindle box by the buoy) and resistor R1-R3. The trigger circuit consists of the 6 NAND integrated circuits lC(Dl-D6) and diode VD1-VD3.   (View)

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The driller safety protection controller

Published:2011/7/22 23:03:00 Author:qqtang | Keyword: driller, safety protection controller

The working principle of the circuit The driller safety protection controller consists of the trigger switches Sl-Sn, resistors of R1 and R2, potentiometer RP, capacitors C1-C3, LED VL1 and VL2, diodes of VD1 and VD2, time-based circuit IC and relay circuit K, see as figure 8-86. The 6.3V AC voltage from the driller lighting transformer provides with DC working power supply for the IC after it is rectified by VD1 and filtered by C3.   (View)

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The punch safety protection controller

Published:2011/7/22 22:54:00 Author:qqtang | Keyword: protection controller

Here is to introduce a punch safety protection controller which can automatically cut off the power supply circuit of the punch electric magnetic clutch when the hand is close to the modes, so the punch won't injure the operator's hand, thus the safety of the operator is assured.The working principle of the circuitThe punch safety protection controller circuit consists of the DC regulator power supply circuit, infrared detection control circuit and control executing circuit, see as figure 8-87.   (View)

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Controllable Integrator(F007) Circuit

Published:2011/7/22 6:38:00 Author:Sue | Keyword: Controllable Integrator

Figure1 Controllable integrator (F007) circuit Table1 Controllable integrator's function table. The picture shows the controllable integrator circuit. The circuit has controllable integrator with a complex zero, maintain and different integration time constants. The analog switch is CH300, operational amplifier is F007. In the picture, the values of R,C1,C2 can be configure according to actual requirement. The different control states of the four analog switches can drive the circuit to complete different functions. The diagram shows the relations between the states and functions of control terminal A,B,C,D.   (View)

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Low Cost Differentiator Circuit Composed of CC4069

Published:2011/7/22 7:06:00 Author:Sue | Keyword: Low Cost, Differentiator

The picture shows the low cost differentiator circuit. Usually differentiator consists of operational amplifier, but CMOS phase inverter CC4069 can also compose differentiator with good effect and low cost. Because of CMOS GATE's advantage of linear amplification, it is used to compose differentiator. In the circuit, R1 and R2 can be changed to meet the demand of frequency of amplitude. The two capacitors of 0.1μF are used as compensation to avoidunnecessary oscillation. The integrated circuit can also use GATE circuit of other phase inverter forms, but there should be no buffer, that is a single-stage gate.   (View)

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The industrial oil furnace controller (1)

Published:2011/7/23 2:37:00 Author:qqtang | Keyword: oil furnace, controller

The working principle of the circuitThe industrial oil furnace controller consists of the multi-resonance oscillator, control circuit and fire detection/extinguish alarm circuit, see as figure 8-88. The multi-resonance oscillator consists of the time-based circuit IC1, resistors of R1 and R2, capacitor C1. The control circuit consists of the counter/pulse distributor circuit IC2, reset key S, diode VD1-VD4, resistor R3-R8, transistor V2-V4, relay K1-K3, capacitors C3 and C5-C7.   (View)

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Basic Differentiator Circuit

Published:2011/7/21 0:58:00 Author:Sue | Keyword: Basic, Differentiator

The picture shows the basic differentiator circuit. The circuit can realise differential operation of input and output. The relation between input and output is v0=-RC dv1/dt.   (View)

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Four Interlock Switch Controller(CD4028) Circuit

Published:2011/7/23 5:38:00 Author:Sue | Keyword: Four Interlock Switch Controller(CD4028) Circuit

The four interlock switch controller circuit shown in the picture uses one decimal docoder integrated circuit CD4028 with four BCD code input terminals which have 10 decoding output terminals. The circuit uses its four special input codes to compose a four interlock switch controller. Its circuit is shown in the picture. The circuit consists of CD4028 and four button input switches SB1-SB4 and four output indicator circuit.Four output terminals will be connected to control circuit. CD4028 is 16-pin flat plastic structure, and its four input terminals are A,B,C,D. Its ten output terminals are Q0-Q9.   (View)

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Improved Differentiating Circuit

Published:2011/7/21 0:53:00 Author:Sue | Keyword: Improved, Differentiating

The picture shows the improved differentiating circuit. In the picture, A1 is integrator, and its output is V01=-1/RC ∫v0dt. A2 is phase inverter, and its output is v02=-v01=1/RC ∫v0dt. From the picture we know that, v02=-v1, so v0=-RC dv1/dt.   (View)

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Low Noise Differentiator Circuit

Published:2011/7/22 6:52:00 Author:Sue | Keyword: Low Noise, Differentiator

The picture shows the low noise differentiator circuit. The circuit is made by adding some components to the basic differentiator so it has overload protection capability with good stability and low noise. R's access can make the circuit stable and can reduce the noise, increase the input impedance. When working frequency of the differentiator is not high, in order to restain high frequency noise, capacitor Cp is added. Voltage-regulator tube is set on consideration that there may be large single-stage noise. Cp can help to maintain the stability of the circuit.   (View)

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The car sound burglarproof alarm (1)

Published:2011/7/23 2:51:00 Author:qqtang | Keyword: burglarproof alarm

The working principle of the circuit The car sound burglarproof alarm consists of the photoelectric detection control circuit, self-detection circuit, low-frequency oscillator circuit and alarm circuit, see as figure 7-10. The photoelectric detection control circuit consists of the photocoupler VLC, resistors of R1 and R3, the D1 inside the 4 NAND integrated circuits IC(Dl-D4). The self-detection circuit consists of the resistors of R2 and R4-R7, D4 inside IC, capacitor C1, transistor V1, LED VL and buzzer HA1.   (View)

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Practical Differentiator Circuit

Published:2011/7/21 8:58:00 Author:Sue | Keyword: Practical Differentiator

The picture shows the practical differentiator circuit. The circuit consists of common operational amplifier. When the differentiator inputs a triangle wave, it outputs a square wave. The frequency of the input signal is decided by the resistor R1,R2 and the capacitor C. The circuit requires R1's resistance value to be 1/10 of R2's resistance value, that is: R1=R2/10. The capacitor C's capacitance value is determined by R2's value as well as the input frequency fin, and their relation is: C=1/R2fin. Similarly, if C's value is already known, then R's value can be got from the following formula: R2=1/Cfin.   (View)

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