Circuit Diagram

The ultrasonic ranging circuit

Published:2011/6/3 9:29:00 Author:Seven | Keyword: ultrasonic ranging

The circuit in Figure 9.12 can be used to measure the distance of 10mm~3m. This circuit is made of LM1812 special integrated chip, the external circuit is like the circuit in Figure 9.11-2, the secondary coil of transformer T and the 500pF capacitor of C1 are modulated in the frequency of 50~60kHZ, while L1 is also in it. From the oscilloscope, we can see the maximum echo sensitivity on 1-pin. The step-up transformer t1 can provide with a bias voltage of 150v for the matrix converter.   (View)

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The 875p computer main board circuit (104)

Published:2011/6/5 1:32:00 Author:Seven | Keyword: main board

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The 875p computer main board circuit (105)

Published:2011/6/5 1:33:00 Author:Seven | Keyword: main board

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The 875p computer main board circuit (106)

Published:2011/6/5 1:35:00 Author:Seven | Keyword: main board

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The 875p computer main board circuit (107)

Published:2011/6/5 1:36:00 Author:Seven | Keyword: main board

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ATMEL AT89C51SND1 MP3 principle circuit

Published:2011/6/5 1:20:00 Author:Seven | Keyword: principle circuit

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The electric counter circuit

Published:2011/6/6 22:50:00 Author:qqtang | Keyword: electric counter

The counter can switch mechanical counting in to the electric counting, and it is LED digital display, which is simple, and it can be used in many industries and meet the needs of modern industries and life. The principle working circuit is shown in the figure, which includes power supply, photoelectric counting and counting display, three parts. The photoelectric counting sector: when the light dependent triode VT1 receives the infrared rays from the infrared diode VD1, the its current is rising , internal resistance is reducing and the pole is outputting a low LEV.   (View)

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TC9308-030--the system control microcomputer integrated circuit

Published:2011/6/6 22:40:00 Author:qqtang | Keyword: system control, integrated circuit

1.function featuresTC9308-030 contains key scanning pulse generator, key scanning pulse encoder, wave shift circuit, storage circuit, clock oscillating circuit, silence/mute control circuit, modulation channel selector control circuit, test circuit, reset circuit, fast-forward and rewind control circuit, modulation frequency step control circuit, LCD screen display decoding and phrase display drive control circuit, etc.2.pin functions and dataTC9308-030 is in 60-pin package, whose pin functions and data are listed in Table 1.   (View)

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TC9316F-003--the system control microcomputer integrated circuit

Published:2011/6/6 22:30:00 Author:qqtang | Keyword: system control, integrated circuit

TC9316F-003 is a system control microcomputer integrated circuit produced by Toshiba, which is usually used in Aiwa, Sanyo and local walkmen and repeaters.1.function featuresTC9316F-003 contains the key matrix encoding circuit, clock oscillator circuit, modulation control circuit, LCD screen decoding drive circuit.2.pin functions and dataTC9316F-003 is in 60-pin square package, whose pin functions and data are listed Table 1.Table 1. pin functions and data of TC9316F-003   (View)

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The sound circuit:LA4225A

Published:2011/6/3 9:37:00 Author:Seven | Keyword: sound circuit

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The ultrasonic wave receiver circuit

Published:2011/6/5 21:06:00 Author:Seven | Keyword: ultrasonic wave

Figure 9.7 shows a receiver circuit of high sensitivity. The signals, which are received from the microphone UW, is magnified to 1000 times by NE542V. And the output is rectified by VD1 and VD2 into a DC, finally, it takes actions by the VMOS transistor controller. The output current of VMOS transistor can reach 2A. Therefore, large load can be driven, such as the magnetic valve, high-power light and so on.   (View)

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The diode fast selector circuit

Published:2011/6/6 22:13:00 Author:qqtang | Keyword: fast selector

Before the test on diode parameter, we should complete the selection on the readiness of the diode, so that we can delete the useless diodes. At the moment, it time-consuming to do test with multimeter or transistor curve tracer, because both a forward and backward test should be done, and the polarity of the dim pipes should be told. With the circuit in the figure, the polarity needn't be noticed, just insert it into the hole and we can make judgement.   (View)

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TCL868(21)A--the communication single chip microcomputer integrated circuit

Published:2011/6/6 22:00:00 Author:qqtang | Keyword: communication single chip, integrated circuit

1.function featuresTCL868(21)A contains the clock oscillating circuit, power supply ON/OFF control circuit, low-voltage measuring circuit, signal receiving signal process circuit, key scanning pulse generating circuit, key order encodeing circuit, off-hand trigger control circuit, LCD display starting control circuit and so on.2.pin functions and dataTCL868(21)A is in 32-pin dual line package, and its pin functions and data are listed in Table 1.Table 1 pin functions and data of TCL868(21)A 3.typical application circuit   (View)

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MC1391 line oscillation PLL integrated circuit

Published:2011/6/9 2:17:00 Author:Christina | Keyword: line oscillation, PLL, integrated circuit

The MC1391 is designed as one kind of line oscillation PLL integrated circuit that is produced by the MOTOROLA company, it can be used in the computer color displayers such as the ASahi series color displayers. 1.Features The MC1391 is composed of the phase discriminator, the oscillation circuit, the pre-amplifier circuit, the voltage-stabilizing circuit.etc. The internal circuit block diagram is as shown in the figure. The internal circuit block diagram of MC1391 2.The pin functions and data of pin-5 The MC1391 uses the 18-pin dual-row DIP package, the pin functions and data are as shown in the table. The pin functions and data of the MC1391 3.Typical application circuit The typical application circuit of the line oscillation PLL integrated circuit which is composed of the MC1391 is as shown in the figure. The typical application circuit of the line oscillation PLL integrated circuit which is composed of the MC1391   (View)

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The survey meter circuit of LED display

Published:2011/6/6 21:38:00 Author:qqtang | Keyword: survey meter, LED display

In the figure is the survey meter circuit of LED display, which can play a big part in solving some physical experiment problems. A and B are the input terminals of the current under test. Transistors of VQ1, VQ3 and VQ2, VQ4 form the coupling DC amplifier of common emitting poles on the two sides, respectively, and the LED of VD1～VD5 and VD6～VD10 are the display elements of two directions. When the current flows to B from A, the transistor of VQ2 cuts down its basic pole LEV, the working voltage is going down and VQ4 is blocked with it.   (View)

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TCL868(21)B--the microcomputer integrated circuit of the communication single chip

Published:2011/6/6 12:53:00 Author:qqtang | Keyword: integrated circuit, communication single chip

　TCL868(21)B--the microcomputer integrated circuit of the communication single chipTCL868(21)B is the 4-bit CMOS microcomputer integrated circuit which is specially used by TCL. It is used in TCL wireless phones, and it is as the principal machine control circuit.1.functions featuresTCL868(U)B includes a FSK decoder which conforms to BELL202 or TrU-TV23 standard, the dual audio signal generator, the low-voltage circuit of the 4-stage detection plate and clock oscillator circuit, etc. It can not only process the received signals, but also has functions of pulse/dual-audio multi-audio compatible dialing and other control functions.2.pin functions and data   (View)

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MC3362 small power narrowband FM receiving integrated circuit

Published:2011/6/9 1:38:00 Author:Christina | Keyword: small power, narrowband, FM, receiving, integrated circuit

The MC3362 is designed as one kind of small power narrowband FM receiving integrated circuit that is produced by the MOTOROLA company, and it can be used in the FM receiving circuit of the narrow band audio and data communications. 1.Features The MC3362 has two narrowband FM receiving circuit of the FM conversion oscillator and the mixer, the internal circuit is as shown in the figure (c). 2.Pin functions The MC3362 has two packages: one is the 24-pin dual-row DIP package, as the figure (a) shows; another is the 24-pin small SMD package, as the figure (b) shows. The internal circuit of the MC3362 3.Typical application circuit The decoder typical application circuit which is composed of the MC3362 is as shown in the figure. The pin functions is as shown in the table. The typical application circuit of the MC3362 The pin functions of the MC3362   (View)

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the drinking water machine, Samsung 57c2304,with LCD display

Published:2011/6/5 20:56:00 Author:Seven | Keyword: drinking water machine

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MC6338 fan single chip microcomputer integrated circuit

Published:2011/6/9 1:19:00 Author:Christina | Keyword: fan, single chip, microcompute, integrated circuit

The MC6338 is designed as one kind of fan single chip microcomputer integrated circuit that is produced by the MOTOROLA company, and it can be used in the fan program-controlled systems. The MC6338 is in the 18-pin dual-row DIP package, the typical application is as shown in the figure, the pin functions and data is as shown in the table. The typical application circuit of the MC6338 The pin functions and data of the MC6338   (View)

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MC6805R3 air conditioner single chip microcomputer integrated circuit

Published:2011/6/9 1:13:00 Author:Christina | Keyword: air conditioner, single chip, microcomputer, integrated circuit

The MC6805R3 is designed as one kind of air conditioner single chip microcomputer integrated circuit that is produced by the MOTOROLA company, and it can be used in the Mitsubishi and Haier series air conditioner. 1.Pin functions The MC6805R3 is in the 40-pin dual-row package, the pin functions are as shown in the table. The pin functions of the MC6805R3 2.Typical application The typical application circuit of the air conditioner control circuit which is composed of the MC6805R3 is as shown in the figure. The typical application circuit of the MC6805R3   (View)

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