Control Circuit

Musical Lantern Controller(NE555,CD4066,CD4017)

Published:2011/8/18 5:50:00 Author: | Keyword: Musical Lantern, Controller

The picture shows the musical lantern control circuit. The controller consists of acoustic electric transduce and amplifying circuit, clock pulse generator, counting circuit and control circuit. The pickup transmitter MIC willconvert the acoustic signal to electric signal which will be put onto four circuits of analog switch CD4066(IC3) after it is amplified by BG1-BG3. The clock pulse generator consists of IC1(555), W1,R1,R2,D1 and C1. The circuit's signalperiod T=0.693(Rw1+R1+R2)C1, and the correspondence period T in the picture varies in the range of 0.5-5s, among which 555(pin 3) is output and put on IC2 to work as CP pulse.   (View)

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Industrial Touch Electronic Switch Circuit Composed of NE555,CD4013

Published:2011/8/10 7:21:00 Author:Sue | Keyword: Industrial, Touch, Electronic Switch

Industrial control switch is used frequently and has a complexed working environment. And it may be influenced by various interferences, so it is required to be strong and durable with easy operation and strong anti-interference ability. The circuit generates and forms trigger signal through touch signal input circuit. It triggers the bi-directional thyristor which will make the controlled circuit connected or disconnected. It has no reliable anti-interference circuit and its work is reliable. The picture shows the circuit. The circuit uses monostable trigger which is composed of NE555 to generate control pulse, and it uses bistable trigger which is composed of CD4013 as trigger control, and it uses bi-directional thyristor as control switch.   (View)

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Mazda 96PROBE(2.5L) cruise control circuit

Published:2011/8/23 22:21:00 Author: | Keyword: Mazda, cruise control, 2.5L

The Mazda 96PROBE(2.5L) cruise control circuit is as shown in the figure:   (View)

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Mazda 96PROBE body computer circuit

Published:2011/8/23 22:23:00 Author: | Keyword: Mazda, body computer

The Mazda 96PROBE body computer circuit is as shown in the figure:   (View)

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Controllable conversion rate circuit

Published:2011/8/14 21:31:00 Author:TaoXi | Keyword: Controllable, conversion rate

The controllable conversion rate circuit is as shown in the figure. It controls the conversion rate by adjusting the signal rising velocity, if it is used in the system which use the voltage signal to control the motor speed, it can control the deceleration and acceleration of the motor. The comparator circuit is composed of A1, the amplitude limiting circuit is composed of the VD1 and VD2. The conversion rate is decided by the VD1 and VD2's positive voltage drops and the product of the (R(RP1)+R1) and Cl, the larger the values of R(RP1), R1 and Cl, the smaller the conversion rate is.   (View)

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The circuit uses the pulse width modulation mode to control the load

Published:2011/8/14 22:09:00 Author:TaoXi | Keyword: pulse width, modulation mode, load

The circuit that uses the pulse width modulation mode to control the load is as shown in the figure. The oscillation frequency of the circuit is decided by the Rl+R(RP1) and C1, f=1/[2·2(Rl+R(RP1)Cl]. The waveform duty cycle is decided by the (Rz+R(RP2)) and C2. The optocoupler TLP5llGA has the electrical isolation effect for the output and input, so the output can use the 220V AC high voltage power supply. The LED can be used to display the changes of the duty cycle.   (View)

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Electric fan infrared remote control governor circuit

Published:2011/8/11 20:00:00 Author:TaoXi | Keyword: Electric fan, infrared, remote control, governor

The electric fan infrared remote control governor circuit is as shown in the figure.   (View)

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Electric fan infrared remote control speed control switch circuit

Published:2011/8/11 20:08:00 Author:TaoXi | Keyword: Electric fan, infrared, remote control, speed control switch

Emitter: Receiver:   (View)

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Incubator constant temperature control circuit

Published:2011/8/14 19:20:00 Author:TaoXi | Keyword: Incubator, constant temperature, control circuit

The incubator constant temperature control circuit is as shown in the figure. In this circuit, the control voltage has the linear relationship with the effective value of the heater converter, in the positive half cycle of the control thyristor vs cathode voltage, the AC22V voltage charges the timing capacitor C3 through the VD1 and R2. A4 is the comparator, it compares the voltage of C3 with the heater control voltage of C2, when the voltage of C3 is the same as the voltage of C2, A4 supplies the trigger pulse to the vs gate pole. This circuit uses the U2 to control the V2's pulse position, and it makes the C3 reset through VT5. The S shape U3 waveform makes the U2 have the good linear relationship with the effective value of the heater converter.   (View)

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Gain control circuit diagram

Published:2011/8/24 1:56:00 Author:Ecco | Keyword: Gain control

Gain control circuit consists of variable gain operational amplifier AD603 and precision op amp ADOP37. The AD603 is the core, and it is supplemented by external circuit programmable amplifier, and the gain control voltage is linear. SCM controls the D / A output amplifier gain. The circuit diagram is shown as the chart.   (View)

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Bistable counting control trigger circuit

Published:2011/8/23 2:20:00 Author:Ecco | Keyword: Bistable counting, control trigger circuit

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Disyllable control citcuit diagram

Published:2011/8/11 6:06:00 Author:nelly | Keyword: disyllable, control

This cirucit executes simple on/off control function by amplifier inputing signal. when the input tone is 1800Hz, the relay is closed by two 567 decoders with self-locking function; when the input tone is 1950Hz, the relay releases. The diode is 1N4001. The relay can adopt 12V or 14V. Q1 is 2N3906, MPS6521 or 2N2222.   (View)

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The base drive circuit of white light LED

Published:2011/8/11 5:24:00 Author:nelly | Keyword: drive circuit, white light LED

Composed of switch converter, the base drive circuit of white light LED is shown in the figure1, the general switch converter controls the converter's output voltage after the feedback voltage UFB and internal reference voltage UREF are compared. If the environmental brightness signal is introduced into the LED brightness control circuit, then the white light LED drive circuit which is shown in the figure1 is changed into the circuit in the figure 2. The difference between figure1 and 2 is: the circuit in the figure 2 has Tr1, resistance R1, R2 and OP amplifier IC1.   (View)

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Voltage frequency transformation circuit diagram composed of AD654

Published:2011/8/10 6:34:00 Author:nelly | Keyword: voltage frequency, transformation

As shown in the figure, it is the low cost voltage frequency converter which is composed of AD654. Connecting the needed devices R1 and C1 as the figure, then it can be the VFC application circuit. The power voltage still can ensure the performance even drop to 4.5V, ensuring the performance to 16.5V, the maximum power consumption is 3mA(no load). The maximum frequency is 520KHz. The range of input voltage is 0~4V. The input measuring range Vi is decided by R1, Vi/R1=1mA. For example, Vi=0~1V, taking R1=1kΩ, Vi=0~5V, taking R1=5kΩ. The output frequency range is determined by C1, Fomax=1/10 C1, the frequency unit is KHz, C1's unit is μF.   (View)

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Practical pulse signal generator circuit diagram

Published:2011/8/10 3:53:00 Author:nelly | Keyword: pulse, signal generator

As shown in the figure, it is a practical pulse signal generator with adjustable duty cycle. The pulse frequency generator circuit is composed of A1 and some peripheral devices, it connects three different capacitors which have three different frequency measuring range, RP1 is used to accurately adjust the frequency. The modulation signal generator circuit consists of A3 and some peripheral devices, it also has three kinds of measuring range, RP2 is used to accurately adjust the frequency signal. RP3 is used to the gain adjust of modulation signal. RP4 controls the duty cycle.   (View)

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The classic applying circuit of MAX743 setting up switch DC-DC convertor

Published:2011/8/14 7:24:00 Author:leo | Keyword: Classic applying circuit, setting up switch, DC-DC convertor

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Photonics relay with locking function which is made by Darlington phototransistor

Published:2011/8/11 11:06:00 Author:leo | Keyword: Photonics relay, locking function, Darlington phototransistor

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Key oscillator made by CC4528

Published:2011/8/14 7:00:00 Author:leo | Keyword: Key oscillator

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AC-DC three-digit voltmeter circuit

Published:2011/8/11 4:36:00 Author:John | Keyword: three-digit voltmeter

The voltmeter circuit’s input stage uses operational and a diode feedback to form a linear peak rectifier circuit. Then the circuit is isolated via R2/R3 divider and is sent to A / D converter CA3162E output from the dual integral multiple BCD. It can be also said to that the 0 ~ 1V DC test voltage is directly added between the differential inputs ⑾ and ⑽ of the CA3162E. If ⑽ is not connected to ⑺ for use, resistor with less than100kΩ should be used to connect to them. The voltmeter input ranges from 0 to +9.99 V. It only displays the peak value of the AC input voltage. When AC rms should be displayed, the transform circuit is needed to attenuate appropriately.   (View)

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LCD direct drive circuit

Published:2011/8/11 3:31:00 Author:John | Keyword: LCD, direct drive

Every phase of LCD has the separate counter, latch, decoder and driver. Excitation signal is also fed back to the floor plate of LCD (liquid crystal display). When the display segment is disconnected, the floor plate and display segment drive signal to be with the same phase and amplitude. So there is no voltage across the segment. When the segment is encouraged, the excitation signal phase is greater than 180 °. So the square-wave voltage is two times more than the IC supply voltage. Dual-counter BCD from the cascade MC14518 can input signals by generating BCD code.   (View)

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