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Index 203

The high-end current monitor circuit formed by OP184

Published:2011-6-8 21:12:00 Author:leo | Keyword: The high-end current monitor circuit formed by OP184, 2SA970, OP184, MOSFET

The high-end current monitor circuit formed by OP184
The picture shows a high-end current monitor circuit formed by OP184. In this circuit, A1 adopts OP184 operating amplifier. VT1 adopts 2SA970 transistor. When Is comes close to OA, the collector cutoff current of VT1 is the main factor that causes differences. When VT1 selects P channel JFET, it can improve detection precision. Now JFET with high pressure resistance is rare. So P channel MOSFET can be used instead of it. Using high degree accuracy resistance will also improve the detecting accuracy.   (View)

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The circuit diagram of amplier formed by 2SJ114

Published:2011-6-8 21:34:00 Author:leo | Keyword: The circuit diagram of amplier formed by 2SJ114, 2SJ114

The circuit diagram of amplier formed by 2SJ114
The picture 1 shows a amplifier circuit formed by 2SJ114.It can amplify square wave signal of ±l0V to ±48V. This circuit adopts P channel and N channel power MOSFET(VT7 and VT8) to form switch circuit. And the switch circuit is symmetry in the face and the below sides, so it can output dual polarity voltage. Due to the operating mode of VT7 and VT8 (the same power source), it needs to use VT3 to VT6 transistors to form the low resistance drive circuit in order to improve the response speed of gates.   (View)

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The high-end current monitor circuit formed by INA168

Published:2011-6-8 21:50:00 Author:leo | Keyword: The high-end current monitor circuit formed by INA168, INA168

The high-end current monitor circuit formed by INA168
What the picture shows is a high-end current monitor circuit formed by INA168. When detecting the changing current of the power supply, loop wire is connected to the ground by the side. Sometimes, the enclosure and rock can not be connected to diverge resistance, it needs to connect Rs to the plus terminal of power supply to test the voltage difference generating by the current passing through Rs in order to detect the current passed through. In this circuit, INA168 is specailly used to detect the current. The followings are some parameters of it: The voltage of power supply is 30 to 60 V. The maximum current it can detect is 10 A. When the current value is 10 A, the output detecting voltage should be 4 V. When the detecting voltage of power supply is low, it needs to use operating amplifier to form differential amplifier. But this circuit is suitable for the application under high power supply.   (View)

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The high-speed absolute value amplifier circuit diagram

Published:2011-6-8 22:01:00 Author:leo | Keyword: The high-speed absolute value amplifier circuit diagram, LM318, HA2525

The high-speed absolute value amplifier circuit diagram
The picture 1 shows a high-speed absolute value amplifier circuit. The operating amplifier and diode form the ideal diode circuit which is used to detect communication signals. However, in the ideal diode circuit, rectified input voltage gives an effect directly to the frequency of operating amplifier and high frequency is limited. High speed operating amplifier, such as LM318, HA2525, μA715 and so on, can ensure an over 100kZ operating frequency. Operational Amplifier should be selected in the high-speed absolute value amplifier circuit. In this circuit, A1 uses HA2526 operational amplifier and also LM318. But the cut-off distortion of diode affects the high frequency operating, therefore, it takes VT1 and VT2 to form constant current source in this circuit.   (View)

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The low-end current monitor circuit formed by AD8551

Published:2011-6-9 2:47:00 Author:leo | Keyword: The low-end current monitor circuit formed by AD8551, AD8551

The low-end current monitor circuit formed by AD8551
The picture shows a low-end current monitor circuit formed by AD8551, which is used to detect the motor current or charging current. When detecting the current of the motor or rechargeable battery, high-end monitor is frequently used, which is usually used to detect the power sourcing current. In this circuit, A1 adopts highly accurate operating amplifier AD8551 which uses +2.7 to +5V signal power source to operate.   (View)

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The high input resistance amplifier circuit formed by FET

Published:2011-6-8 22:13:00 Author:leo | Keyword: The high input resistance amplifier circuit formed by FET

The high input resistance amplifier circuit formed by FET
The picture 1 shows a high input resistance amplifier circuit. The picture 1(a) is the sourcing follower circuit formed by FET. The voltage gain of the follower: Av=gmRL/(l+gmRL); gm is mutual conductance; RL is sourcing load resistance. If Ac needs to be near 1, FET with bigger gm value is needed with the resistance value RL as big as possible. In order to increase the RL value, constant sourcing current formed by VT2 is adopted. The picture1 (b) is the high input resistance circuit formed by FET. R1 is the grid offset deciding resistance. The current pass through R1 is usually very small. So the resistance is super high in the circuit.The Picture1 (c) is the circuit connected to operational amplifier. It is made up of two simple FET. RP1 is used to investigate the offset voltage.   (View)

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Overvoltage Detection Circuit Diagram formed by LTC1541 and Others

Published:2011-5-21 21:34:00 Author:leo | Keyword: Overvoltage Detection Circuit Diagram formed by LTC1541 and Others, 1N4005, ZTX458, 100K, 300K, 600V, LTC1541, 240V


As the picture shows, this is a overvoltage detection circuit. It is applied to detect the overvoltage in any power supply circuit with a detection scale from 3 V to hundreds of voltage. Besides, it can also be used to lock detect the voltage which can detect 30μs transient overvoltage peak pulse. Under the common condition, the current consumption of this circuit will be under 25μA. So it is the best voltage control circuit in the battery power supply system. LTC1541 applied in this circuit is a kind of integrated circuit which contains a comparator A1 that has a small power compensation, operating amplifier A2 as well as UREF with the referred voltage of 1.20 V. This circuit demands a maximum of 13μA.   (View)

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Digital Meter Panel Circuit Diagram made up of PIC16C711 and Others

Published:2011-5-20 22:13:00 Author:leo | Keyword: Digital Meter Panel Circuit Diagram made up of PIC16C711 and Others, PIC16C711

Digital Meter Panel Circuit Diagram made up of PIC16C711 and Others
As the picture shows, this is a electrical digital meter panel circuit. As a 8 bits A/D converter, PIC16C711 has two input ports. Among them, AD0 is voltage input port and AD1 is scale selecting input port. If AD1 is connected to ground, it will show a scale of 0.00 V to 5.10 V with resolution of 20 mV. If AD1 is connected to 2.5V voltage, it will show a scale of 00.00 V to 12.75 V with the resolution of 50 mV. If AD1 is connected to 5 V, it will show a scale of 00.0 V to 25. 5 V and the resolution will be 100 mV. Under the common condition, PIC16C711 display accuracy is ±1/2LSB. It can drive four seven-port LED at the same time and only one LED can be lighted at one time. The input voltages of PIC16C711 are 5 V, 12 V and 25 V.   (View)

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MAX489/491 low power consumption RF transceiver circuit

Published:2011-5-26 1:15:00 Author:Christina | Keyword: low power consumption, RF transceiver

MAX489/491 low power consumption RF transceiver circuit
The MAX489/491 is designed as one kind of low power consumption RF transceiver that can be used in the RS-485 and RS-422 standard communications, it has the short-circuit current limiting function. The driver part's output port is in the high impedance state when it gets into the hot standby state, so it can prevent the overload of load; the receiver part's input port has the safety function to prevent the opening circuit, and it can undertake full-duplex communication. The MAX489/491 uses the conversion rate driver to minimize the electromagnetic interference, and it also has the inhibiting effect to the reflection which is caused by the not appropriate port-connection of the cables, so there is no error when it is transmitting the data in the high speed of 250Kb/s, the driver's highest changing rate can reach 2.5 Mb/s, so it can be used in the industrial automatic control data transmission application.   (View)

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A/D converter 5G14433 and the microprocessor general interface circuit

Published:2011-5-26 7:17:00 Author:Christina | Keyword: A/D, converter, microprocessor, general interface

A/D converter 5G14433 and the microprocessor general interface circuit
  (View)

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MT8803--the infrared remote controller integrated circuit

Published:2011-6-10 21:38:00 Author:qqtang | Keyword: infrared remote controller, integrated circuit

MT8803--the infrared remote controller integrated circuit
MT8803--the infrared remote controller integrated circuit

MT8803 is an infrared remote controller integrated circuit, which often forms the fan remote control system with the remote signal receiver circuit MR8181 and the fan single chip integrated circuit MH8822, such as the Great Wall fan and the like. MT8803 is in 16-pin dual line package, whose typical application circuit is shown in the figure, and its pin functions and data are listed in the figure. The typical application circuit of MT8803 The pin functions and data of MT8803   (View)

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MSP3410B--the multi-system sound process single chip integrated circuit

Published:2011-6-10 21:47:00 Author:qqtang | Keyword: multi-system sound process, single chip

MSP3410B--the multi-system sound process single chip integrated circuit
MSP3410B--the multi-system sound process single chip integrated circuit
MSP3410B--the multi-system sound process single chip integrated circuit
MSP3410B--the multi-system sound process single chip integrated circuit

1.function featuresMSP3410B contains the A/D converting circuit, D/A converting circuit, I2C general and I2C general connector circuit, S general connector circuit, sound demodulation circuit, NICAM decoding circuit, audio output shifting circuit and other additional function circuit. The internal circuit of MSP3410B is shown in the figure. The internal circuit of MSP3410B2.pin functions and dataMSP3410B is in 68-pin square package, whose pin functions and data are listed in the table.The pin functions and data of MSP3410B   (View)

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MR8181--the integrated circuit of the infrared remote signal receiver

Published:2011-6-10 21:57:00 Author:qqtang | Keyword: integrated circuit, infrared remote signal receiver

MR8181--the integrated circuit of the infrared remote signal receiver
MR8181 is an integrated circuit of the infrared remote signal receiver, which is often used with the remote emitter integrated circuit MT8803, fan single chip microcomputer integrated circuit MH8822, and they form the fan remote control system, such as the Great Wall fan and the like.1.pin functions and dataMR8181 is in 8-pin single line package, whose pin functions and data are listed in table 2. The pin functions and data of MR8181 2.the typical application circuitThe typical application circuit of the remote signal receiver, which consists of MR8181, is shown in the figure of MH8822.   (View)

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MN1874876TSH--the single door microcomputer integrated circuit

Published:2011-6-10 22:22:00 Author:qqtang | Keyword: single door microcomputer, integrated circuit

MN1874876TSH--the single door microcomputer integrated circuit
MN1874876TSH--the single door microcomputer integrated circuit
MN1874876TSH--the single door microcomputer integrated circuit

1.function featuresMN1874876TSH consists of the clock oscillating circuit, CPU, reset circuit, key decoding circuit, screen display circuit, I2C general circuit and other affiliated function circuits.2.pin functions and dataMN1874876TSH is in 64-pin dual in-line package, whose internal circuit, pin functions and signal flow are shown in the figure, and the pin letter codes and data are listed in the table. The internal circuit, pin functions and signal flow of MN1874876TSH   (View)

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The spectral character circuit of light filter

Published:2011-6-10 21:26:00 Author:qqtang | Keyword: spectral character

The spectral character circuit of light filter
The sensor consists of the shell, light filter, heat electric element PZT, FET pipe, resistor and diode,etc. The light filter is installed at the window, which forms a infrared window. The light filter is a multi-film interference filter of 6μm, this filter has a high reflection ratio on sunlight and daylight lamp light that the short wave is under 5μm, but it has a high penetration on the infrared ray source(10μm) which is emitted by human bodies and higher than 6μm, the spectral characters are as shown in figure 26-62.   (View)

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The construction circuit of heat-release electric infrared sensor

Published:2011-6-10 21:30:00 Author:qqtang | Keyword: construction circuit, infrared sensor

The construction circuit of heat-release electric infrared sensor
Figure: The construction circuit of heat-release electric infrared sensor   (View)

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DS14185 data interface driver/receiver combination circuit

Published:2011-5-25 21:15:00 Author:Christina | Keyword: data interface, driver, receiver, combination

DS14185 data interface driver/receiver combination circuit
The DS14185 is composed of three drivers and five receivers, it has the DC-DC converter and does not need the +12V power supply. The DS14185 has the noise filter inside, so there is no need to add the rate conversion filter capacitance. The DS14185 can be used in the applications of the data terminal equipment (DTE) and the data circuit terminal equipment (DCE). The drive input port and the receiver output port is compatible with the TTL or CMOS circuit. From the data terminal equipment (DTE)'s transmission interface to the data circuit terminal equipment (DCE)'s transmission interface, there are nine pins, among them there are two data lines and six control lines. The data lines are the TXD and RXD, and the control line are the RTS、DTR、DSRT、DCE、CTS、RI. The DS14185 supplies the DTE interface, the wiring method is as shown in the figure.   (View)

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Single chip microcomputer integrated circuit

Published:2011-6-8 1:45:00 Author:Christina | Keyword: Single chip, microcomputer, integrated circuit

Single chip microcomputer integrated circuit
Single chip microcomputer integrated circuit

The MNl52811TZX is designed as one kind of single chip microcomputer integrated circuit that is produced by the Panasonic corporation, and it can be used in the domestic and imported color TVs which use the Panasonic machine. 1.Features The MN152811TZX integrated circuit is composed of the central processing unit (CPU), the clock oscillating circuit, the reset control circuit, the key instruction decoder circuit, the I2C bus control circuit, the remote control command signal processing circuit, the screen display circuit, the standby/boot control circuit, the mode selection circuit, the single-frequency control circuit and other control and auxiliary function circuits. 2.Pin functions and data The MN152811TZX is in the 42-pin dual in-line package, the internal circuit block diagram and the signal flow are as shown in the figure, the pin-letter code and the data is as shown in the table. The internal circuit block diagram and the signal flow of the MN152811TZX The pin-letter code and the data of the MN152811TZX   (View)

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MN152810TZN single chip microcomputer integrated circuit

Published:2011-6-8 1:49:00 Author:Christina | Keyword: single chip, microcomputer, integrated circuit

MN152810TZN single chip microcomputer integrated circuit
The MN152810TZN is designed as one kind of single chip microcomputer integrated circuit that is produced by the Panasonic corporation, also it can be used in the large screen color TVs which are produced by the Panasonic corporation. The MN152810TZN integrated circuit is in the 52-pin double-row type package, the pin functions and data is as shown in the table. The pin functions and data of the MN152810TZN.   (View)

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MN15281OTTD4 single chip microcomputer integrated circuit

Published:2011-6-8 1:58:00 Author:Christina | Keyword: single chip, microcomputer, integrated circuit

MN15281OTTD4 single chip microcomputer integrated circuit
MN15281OTTD4 single chip microcomputer integrated circuit

The MN15281OTTD4 is designed as one kind of single chip microcomputer integrated circuit that is produced by the Panasonic corporation, also it can be used in the large screen color TVs which are produced by the Panasonic corporation. The MN15281OTTD4 integrated circuit is in the 52-pin double-row type package, the pin functions and data is as shown in the table. The pin functions and data of the MN15281OTTD4.   (View)

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