Circuit Diagram

Indoor Air Purifying Sets

Published:2011/8/23 0:46:00 Author: | Keyword: Indoor , Air Purifying Sets

The discharge end made up from needle-shaped material adopts open type.In this way it can reach the goal of increasing the density of negative oxygen ion and reducing the density of ozone.When the atmosphere is normal inside,the potential of the gas sensor Q1's pin④ and pin⑥ is low.VT1 is stopped.The potential of IC3's pin② is high.The oscillator stops working.There's no negative oxygen generated.Rt is negative temperature coefficient thermistor.It compensates the errors causing by gas sensor Q1 as the temperature changes.The potential RP is used to adjust the sensitivity of detecting harmful gas.   (View)

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The electronic sphygmograph

Published:2011/8/23 1:01:00 Author: | Keyword: electronic , sphygmograph

The electronic sphygmograph is shown as the chart.It converts the change of pulse pressure to electric signal through the sensor.Then it is handled by enlarging,shaping,counting, coding and driving.Finally the digitron displays how many times a minute your pulse is pulsing.It is very convenient to use.   (View)

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the instrumentation amplifier or mixer gain and phase difference circuit composed of AD8302

Published:2011/8/23 1:34:00 Author: | Keyword: instrumentation amplifier , mixer gain, phase difference

AD8302 is used to measure the phase difference and gain of the amplifier or the frequency mixing.The 20dB directional couple A and B do the sampling to the output and input signals of the amplifier.It can keep AD8302 signal level within the dynamic range by using 10dB resistance attenuator and 1dB resistance attenuator.To obtain the best performance,the power level POPT equals -30Bm(-43dBv) when two channels corresponding to the 50Ω characteristic impedance.The coupling coefficient and the attenuation coefficient of channel A and B is determained by the formula:in the formula,CA and CA are the coupling coefficient.LA and LB are the attenuation coefficient.GNOM is the nominal gain of the amplifier.   (View)

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the amplier circuit of the radio frequency :Dual-gate MOSFET RF amplifier circuit

Published:2011/8/22 21:35:00 Author: | Keyword: amplier, Dual-gate , MOSFET, RF, amplifier

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Regulator DC-DC Circuit and Pin of Power Supply Monitor and its Main Features TA78DS05P Regulator

Published:2011/9/3 22:42:00 Author:Zoey | Keyword: Regulator, DC-DC Circuit, Pin of Power Supply Monitor, Main Features

The TA78DS05P and TA78DS10P three-terminal regulators can output fixed low-margin voltage, the maximum current output is 30mA, and in a spare state, the typical voltage will be 500μA. The minimum output voltage margin is below 0.3V, and the maximum input voltage is 29V and the power is 800mW. The working temperature varies from -40 to +85℃.This circuit itself has interior overcurrent, overtemperature and short circuit- proof devices, as soon as the voltage exceeds 60V, the power supply will be cut off.   (View)

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The instrument amplifier of removing AC sound (INA101)

Published:2011/8/13 3:09:00 Author:qqtang | Keyword: instrument amplifier, AC sound

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The gain programmable high speed instrument amplifier composed (PGA102 and OPA602)

Published:2011/8/13 3:14:00 Author:qqtang | Keyword: gain, programmable, high speed, instrument amplifier

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The precise separating instrument amplifier (INA102)

Published:2011/8/13 3:16:00 Author:qqtang | Keyword: precise, instrument amplifier

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Electromotor indicator light circuit controlled by five switches

Published:2011/9/1 2:49:00 Author:Christina | Keyword: Electromotor, indicator light, five switches

From the point of view of electrical safety, the necessary contact is indispensable when we are installating and debugging, repairing or processing. As the figure shows, the H1-H5 are the contact instruction signals, the H1 ～H5 are the normal operation instructions. When you are debugging, repairing or processing the equipment, the interlocking button SA1 is in the position of interlocking position , the three pairs of normally closed contact points cut off, the two pairs of normally open contact points close, the AC contactor KM controls the on/off of the KM through the equipment main control buttons ST1, STP1 only.   (View)

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Lower limit temperature frog sound alarm and automatic heating control circuit

Published:2011/9/1 2:54:00 Author:Christina | Keyword: Lower limit, temperature, frog sound, alarm, automatic heating, control circuit

As the figure shows, it is composed of the lower temperature detection circuit, the alarm circuit, the heating circuit and the AC step-down rectifier circuit.   (View)

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Lower limit temperature bird sound alarm and automatic heating control circuit

Published:2011/9/1 2:54:00 Author:Christina | Keyword: Lower limit, temperature, bird sound, alarm, automatic heating, control circuit

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EDM control circuit

Published:2011/9/1 2:51:00 Author:Christina | Keyword: EDM, control circuit

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Small breaker direct start-up circuit

Published:2011/9/1 3:15:00 Author:Christina | Keyword: Small breaker, direct start-up

The small breaker has a lot of models such as the CN45, the rated current is 63A, there are dozens kinds of buckle-off current which are from 3A to 63A. According to the rated current and the operating specification of the small electromotor, we can use the small breaker with appropriate buckle-off current as the operation switch of the electromotor, it is easy to operates and can protect the electromotor. As the figure shows, the FU is fuse protector, it has the function of short circuit protection and it can cut off the power when you are repairing the fuse QF.   (View)

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Smoke detection alarm circuit

Published:2011/9/1 3:47:00 Author:Christina | Keyword: Smoke, detection, alarm circuit

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Internal short-circuit measurement circuit of the coil

Published:2011/9/2 3:17:00 Author:Christina | Keyword: Internal short-circuit, measurement circuit, coil

When the stator coil of the electromotor is in the local short-circuit state, you can not measure it by using the multimeter. The test circuit in the figure can complete the short-circuit test of the coil. The capacitive three-point oscillator circuit is composed of the transistor VT, the inductance coil L and the capacitors C1 and C2. When the measured stator coil is connected with the A and B of the oscillation circuit, the measured stator coil has the high-impedance if there is no short-circuit fault, it will not influence the operation of the oscillator, the pointer of the milliammeter has no action. When the measured stator coil has short-circuit fault, When it is connected with the A and B of the oscillation circuit, the Q value of the oscillation loop will reduce.   (View)

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Automatic reversing circuit of the phase-electromotor with the inching switch

Published:2011/9/2 2:28:00 Author:Christina | Keyword: Automatic reversing circuit, phase-electromotor, inching switch

As the figure shows, the SA1 and SA2 are the position limit switches; the SB1 and SB2 are the inching switch. Set the SB1 as an example, it is a composite switch, you can start the KMF by pressing it, the electromotor operates positively, if you unclasp the finger, the KMF will loss power, so the electromotor is in the inching state. After you press the STF, the normally closed contact point of SB1 is in the closed state, so the KMF can protect itself, the electromotor can operate long-standing. Set the SA1 as an example, in the normal operation condition, after the mechanical hits the inching switch SA1, the normally closed contact point cuts off to cut off the KMF return circuit, the electromotor stops.   (View)

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Remote control electronic control lock alarm TH151A/B, the micro vibration sensor T968

Published:2011/9/2 2:34:00 Author:Christina | Keyword: Remote control, electronic control, lock alarm, micro vibration sensor

This circuit is composed of the anti-theft host computer, the door magnetic sensor trigger switch, the micro vibration sensor switch, the electric control lock with the key, the free maintenance battery and the AC power supply. The host computer circuit:   (View)

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The speaker overload protection circuit

Published:2011/9/1 3:47:00 Author:Christina | Keyword: speaker, overload, protection circuit

The speaker overload protection circuit is as shown in figure 5. The power is 650mW, the power voltage is 12V, the resistance of the speaker is 25Ω.   (View)

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Sprout greenhouse constant temperature control and cricket sound alarm circuit

Published:2011/9/2 2:55:00 Author:Christina | Keyword: Sprout, greenhouse, constant temperature, control, cricket sound, alarm circuit

As the figure shows. It is composed of the temperature detection circuit, the relay control heating circuit, the cricket sound alarm circuit and the AC step-down rectifier circuit. It can control the temperature of the 10～16m2 greenhouse in the range of 28℃±0.5℃. When the temperature is lower than the set temperature, the circuit will connect to the electric heater automatically and send out the sound of cricket to alarm the host.   (View)

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Gas stove flameout sound and light alarm circuit

Published:2011/9/2 3:02:00 Author:Christina | Keyword: Gas stove, flameout, sound, light, alarm circuit

In the process of using, the stove fire always extinguished by the wind or water, it is very dangerous when there is no people. This gas stove flameout sound and light alarm circuit can send out the sound and light alarm signal when the fire is extinguished to remind the user. The circuit is as shown in the figure.   (View)

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