Holiday color light with disco sound circuit

Published:2011/5/16 9:41:00 Author:Christina | Keyword: Holiday color light, disco sound circuit

The circuit is as shown. It is composed of the clock pulse generator, the counter / divider circuit, the disco analog sound circuit and the AC step-down rectifier circuit.etc.   (View)

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ultrasonic repeling mosquito device

Published:2011/5/16 9:38:00 Author:Christina | Keyword: ultrasonic, repeling mosquito

The ultrasonic ultrasonic repeling mosquito device This is one kind of extremely simple ultrasonic repeling midge, bug, cockroach circuit. This relaxation oscillation circuit is composed of the CMOS 4047 monostable trigger, you can make it's center frequency to 22KHz by adjusting the 4K7, then the signal is output by the bridge type power which is composed of four transistors to promote the 3.25 inch Piezo to send out ultrasonic signal.   (View)

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Practical 3-button interlock electronic switch circuit

Published:2011/5/16 18:50:00 Author:Christina | Keyword: Practical, 3-button, interlock, electronic switch

The circuit structure is simple, when you press any key, the corresponding channel opens. And the contact point's jitter does not affect the circuit's working, so this circuit has the good anti-interference performance. If you remove the rear driver transistor, the circuit's static power consumption is nearly zero. If you remove the button, this circuit can be used to control the pulse.   (View)

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Amplifier circuit uses the frequency to control the gain

Published:2011/5/16 9:07:00 Author:Christina | Keyword: Amplifier, frequency, gain

The amplifier circuit that uses the frequency to control the gain is as shown. Frequency gain control circuit uses the different input clock frequencies to control the amplifier gain. As the figure (a) shows, this circuit is composed of two parts: the analog switch and the integrated amp. The analog switch is composed of two pieces of the precise capacitance switch LTC1043; the integrated operational amplifier uses the JFET input op amp type LT1056.   (View)

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Low Power AC/DC General Motor Thyristor Control Circuit

Published:2011/5/18 19:32:00 Author:Robert | Keyword: Low Power, AC/DC, General, Motor, Thyristor, Control

This circuit is used in the case of AC/DC general series wound motor stepless speed variation. Armature winding is in series with field winding through the thyristor. By the single-phase half-wave phase-shifting commutating control method, the thyristor's control angle could be changed by adjusting the 500ω potentiometer. So it can make the rotate speed be stepless adjusted from zero to the maximum value. This circuit is widely used in small household appliances such as blenders, sewing machines, hand drills and woodworking machinery.   (View)

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DC Motor Driving Circuit

Published:2011/5/18 10:03:00 Author:Robert | Keyword: DC Motor, Driving

The DC Motor Driving Circuit is shown below. These are two DC motor driving circuit, one is driven by electric bridge while the other is driven by integrated circuit L293DD, which is used to drive two DC motor (12V, 80mA). On the other hand, for L293DD input port,maybe it can make the IN1, IN2 (IN3, IN4) connected toghter separately and controlled by a MCU port.   (View)

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Stepper Motor General Driving Circuit

Published:2011/5/18 7:17:00 Author:Robert | Keyword: Stepper Motor, General, Driving

The Stepper Motor General Driving Circuit is shown below. The integrated system uses small type stepper motor, which is not highly required on voltage and current. Tointroduce the application principle, this circuit uses the simplest driving circuit which aiming at verifying the use of stepper motor. When using in normal industrial control it needs to improve from this base model. General driving circuit can shown in picture as follow.   (View)

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Small Electric Heater Temperature Control Circuit Composed Of Three-Wire Serial Interface Smart Temperature Sensor DS1620

Published:2011/5/18 7:08:00 Author:Robert | Keyword: Electric Heater, Temperature Control, Three-Wire, Serial, Interface, Smart, Temperature Sensor

The Small Electric Heater Temperature Control Circuit Composed Of Three-Wire Serial Interface Smart Temperature Sensor DS1620 is shown in the picture below. When t<tL, TL would output high voltage level, which would set the 1/2CD4044 type RS trigger to be 1 and Q=1. This wouldmake the TMOS FET 2N6659 connected and also make the small electric heater's power connected. The 2N6659's UDSO=35V and PD=6.25W.   (View)

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Two-Wire Serial Interface Smart Temperature Sensor TCN75 And 89C51 MCU Interface Circuit

Published:2011/5/18 6:49:00 Author:Robert | Keyword: Two-Wire, Serial, Interface, Smart, Temperature Sensor, MCU

The interface circuit of TCN75 and 89C51 is shown in the picture below. Byletting the TCN75's address input ports A2~A0 all connect to high voltage level UDD, the address code is changed to be 111. The 89C51 can achieve the chip-selection function by software. The 89C51's series data receiving port (RXD) and series data transmitting port (TXD) are connected to the TCN75's SDA port and SCL port separately. TCN75's interrupt/compare signal is connected to 89C51's interrupt port INT0.   (View)

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Motor electronic governor controller 5

Published:2011/5/17 21:07:00 Author:Nicole | Keyword: Motor, electronic governor controller

The circuit work theory This motor electronic governor controller circuit is composed of SCR VT, diode VD1, VD2, bidirectional trigger diode VD, LED VL1, VL2, capacitors C1, C2, resistors R1-R8, speed regulation switch S and motor M, the circuit is shown in the figure 8-62. When the speed regulation switch S gear is changed, the charge-dischange rate of capacitor C is changed, then the SCR VT conduction angle is changed too. The voltage on both sides of C1 will trigger and turn on VT by VD, the AC voltage on both sides of motor M can be changed by changing the conduction angle of VT, then M's running speed is changed too.   (View)

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Motor electronic governor controller 4

Published:2011/5/17 20:41:00 Author:Nicole | Keyword: Motor, electronic governor controller

The circuit work theory This motor electronic governor controller circuit is composed of power supply circuit, time control/trigger pulse generator circuit and control implement circuit, the circuit is shown in the figure 8-61. The power supply circuit is made of depressurization capacitor C5, steady voltage diode VS, rectifier diodes VD2, filter capacitors C1. The time control/trigger pulse generator circuit consists of time base integrated circuit IC, control switch S1, timing/voltage regulation selection switch S2, resistors R1-R3, potentiometers RP1, RP2, capacitors c2-c4. The control implement circuit is composed of resistor R4 and SCR VT.   (View)

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fast inverting amplifier with high input impedance circuit

Published:2011/5/15 2:33:00 Author:John | Keyword: fast inverting amplifier

Fast inverting amplifier with high input impedance circuit is shown below.   (View)

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Music type refrigerator door closing reminder circuit

Published:2011/5/16 8:40:00 Author:Christina | Keyword: Music type, refrigerator, door closing, reminder

The Music type refrigerator door closing reminder circuit is as shown. This circuit is composed of the step-down rectifier voltage-stabilizing circuit, the delay circuit, the music IC CIC2851E, the speaker.etc. The step-down rectifier voltage-stabilizing circuit supplies the 3V DC voltage to the whole circuit. When you open the door of fridge, switch AN connects. and the capacitor C3 is charged through R3, BG1's base potential rises, after about 20 minutes delay, C3's voltage makes BG1 conduction, and makes the BG2 cut-off, and this voltage triggers the CIC2851E to work, the output music signal is amplified by BG3 and drives the speaker Y to send out the music of ling er xiang ding dang.... to remind the master to close the door quickly.   (View)

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precise diode circuit

Published:2011/5/15 6:19:00 Author:chopper | Keyword: precise diode

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Single button switch circuit

Published:2011/5/17 5:07:00 Author:chopper | Keyword: Single button, switch

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Four Line Light Control Circuit

Published:2011/5/17 8:20:00 Author:Robert | Keyword: Four Line, Light, Control

The Four Line Light Control Circuit is shown below.   (View)

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Water Temperature Automatically Control Device Circuit

Published:2011/5/17 7:22:00 Author:Robert | Keyword: Water Temperature, Automatically Control Device

The Water Temperature Automatically Control Device Circuit is shown below.   (View)

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Op amp power supply voltage polarity reverse protection circuit diagram

Published:2011/5/17 3:21:00 Author:Rebekka | Keyword: Op amp, power supply voltage, polarity reverse protection

The protection circuit of the op amp power supply reverse polarity is shown in figure (a), (b). Figure (a) is protection circuit of the single-stage amplifier, Figure (b) is the multi-stage amplifier circuit protection circuit. If the integrated operational amplifier without power polarity protection. The power supply voltage polarity is reversed, a destructive current will pass the chip (usually when the chip is in normal operation, there will be a large current passes the reverse-biased diode). The principle of the protection circuit is very simple. For figure (a), it uses the one-way conductive of the diode, so that the reversed power supply voltage can not be added to the integrated operational. For figure (b), it is concentrated protection circuit. When the power supply voltage is reversed, the diodes D1 and D2 turns on.   (View)

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Op amp power supply over-voltage protection circuit diagram

Published:2011/5/17 3:44:00 Author:Rebekka | Keyword: Over-voltage protection , Op amp power supply

Power supply over-voltage protection circuit is shown as above. Figure (a) is simple and practical over-voltage protection circuit, which uses Zener diode Dz to limit the integrated operational amplifier supply voltage within the safe voltage limit. The selection method of the regulator of the operating voltage can be based on the following formula: Vz ≤ 2Vsmax. Normally Vz should be close or equal to the total power supply voltage, its current limiting resistor R should use high-power resistance, and resistance value should ensure the voltage regulator tube is able to work properly. Figure (b) shows the two functions that overvoltage protection and transient voltage protection. When it is in normal operation mode, the tube pressure of J1 and J2 should be decrease, ± VSD value is low, so the two regulators Dz1 and Dz2 do not work, so none of them is breakdown.   (View)

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Motor electronic governor controller 1

Published:2011/5/17 1:45:00 Author:Nicole | Keyword: motor, electronic governor, controller

The circuit work theory This motor electronic governor controller circuit is composed of power supply circuit, excitation circuit, trigger circuit and speed governing control circuit, the circuit is shown in the figure 8-58. The power supply circuit is made of fuse FU, resistors R1-R3, rectifier diode VD5-VD9, voltage stabilizing diode VS and filter capacitor C3. The excitation circuit consists of resistors Rl5, Rl6, capacitors C1, C2 and diodes Dl-D4. The trigger control circuit is composed of pulse transformer T, unijunction transistor VU, transistors V1, V2, diode VDlO-VDl2, capacitors C4-C6 and resistors R4-R7.   (View)

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