Circuit Diagram

The temperature measuring circuit

Published:2011/6/6 21:51:00 Author:qqtang | Keyword: temperature measuring

In the figure is the temperature measuring circuit, and S1 is the point/bar display mode shifting switch. When the voltage of the power supply is Vcc>8V, LED1～LED10 don't need to connect the current limiting resistor in the serial way. When LED is glowing, the current is set by the external resistors of 4-pin and 6-pin, if 4-pin and 6-pin connect a resistor of 1.2kΩ(including the resistors btween R1, BP1 central head and 4-pin), which connects with transformer of 10kΩ in LM3914 in the parallel way, and then the resistance between 4-pin and 6-pin is about 10.7kΩ, the basic voltage of 1.25v provides the transformer circuit with a current of 1.25V／1.07kΩ≈1.2mA.   (View)

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The MP3 circuit (02)

Published:2011/6/3 8:21:00 Author:Seven | Keyword: MP3 circuit

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The MP3 circuit (1)

Published:2011/6/3 7:59:00 Author:Seven | Keyword: MP3 circuit

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The MP3 hardware circuit (02)

Published:2011/6/3 8:18:00 Author:Seven | Keyword: MP3 hardware

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The MP3 hardware circuit (03)

Published:2011/6/3 8:19:00 Author:Seven | Keyword: MP3 hardware circuit

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The MP3 hardware circuit (01)

Published:2011/6/3 7:51:00 Author:Seven | Keyword: hardware circuit

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the MP3 circuit (6)

Published:2011/6/3 7:56:00 Author:Seven | Keyword: MP3 circuit

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the MP3 circuit

Published:2011/6/3 7:54:00 Author:Seven | Keyword: MP3 circuit

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the MP3 circuit (4)

Published:2011/6/3 7:55:00 Author:Seven | Keyword: MP3 circuit

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P83C266BDR-100--the single door microcomputer integrated circuit

Published:2011/6/9 21:17:00 Author:qqtang | Keyword: single door, integrated circuit

P83C266BDR-100 is a single door microcomputer integrated circuit produced by Philips, which is widely used in Changhong digital large screen color TV, etc.1.function featuresP83C266BDR-100 consists of the CPU, clock oscillating circuit, reset control circuit, key scanning order decoder, remote order signal process circuit, storage control circuit, I2C general control circuit, screen displayed letter generating and processing circuit, standby/starting control circuit and other control and additional circuits, etc.   (View)

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the MP3 circuit (5)

Published:2011/6/3 7:55:00 Author:Seven | Keyword: MP3 circuit

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The MP3 circuit (7)

Published:2011/6/3 7:57:00 Author:Seven | Keyword: MP3 circuit

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The MP3 circuit (8)

Published:2011/6/3 7:58:00 Author:Seven | Keyword: MP3 circuit

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The MP3 hardware circuit (04)

Published:2011/6/3 8:20:00 Author:Seven | Keyword: MP3 hardware circuit

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The MP3 hardware circuit (07)

Published:2011/6/3 9:07:00 Author:Seven | Keyword: hardware circuit

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Access room people number counter circuit

Published:2011/6/8 3:04:00 Author:Christina | Keyword: Access room, people number, counter

Working principle: Two pairs of photoelectric detection devices are installed in the access channel. On one side the light source A (transmitter) and the photoresistor LDR1 (receiver) are installed in the entrance of the channel; on the other side, the light source B (transmitter) and the photoresistor LDR2 (receiver) are installed in the outlet of the channel. The two beams of light need to illuminate on the receiver's photoconductive resistance, and the light beams require the precise orientation. The light source and the receiver's installation location is as shown in the figure. Components selection: The IC1 uses the 7809, 9V regulator ; the IC2 uses the CD4093 four-two input trigger, the IC3 uses the four-two input AND gate.   (View)

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MN152810TTD5 single chip microcomputer integrated circuit

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

The MN152810TTD5 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 Konka and TCL color TVs. 1.Features The MN152810TTD5 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 audio adjusting control circuit, the integrated converter circuit and other control and auxiliary function circuits. 2.Pin functions and data The MN152810TTD5 is in the 52-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 MN152810TTD5 The pin-letter code and the data of the MN152810TTD5   (View)

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The dual channel audio power amplifier circuit

Published:2011/6/3 23:59:00 Author:Seven | Keyword: dual channel, audio power amplifier

As shown in Figure 19.11, this is a dual channel circuit which consists of LM378 double computing amplifiers. When the voltage of power supply is 24v or the load resistance is 8Ω(or 15Ω),either channel can output power of 4W. Inside the circuit, there are current amplitude limit and heat cutting circuit, and there is the pressure steady power supply which allows the bias voltage to be auto-adjustable. Besides, it characterizes high wave limiting, good channel separation, high input impedance and few external elements. Etc. It is specially fit for stereo players, stereo recorders and so on.   (View)

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The dual-pipe energy saving lamp circuit

Published:2011/6/3 9:15:00 Author:Seven | Keyword: dual-pipe, energy saving lamp

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The little device circuit of looking for cable break

Published:2011/6/1 21:47:00 Author:Seven | Keyword: device, cable break

4060 and other parts consist a oscillator of 20KHZ, while the resistance capacitor of 100k and 200PF can change this frequency. Either Q3,Q4 and Q5 of IC can drive the LED or the electric buzzer, so that they can provide with necessary notices. This circuit is fixed in a metal case. When testing, we should hold the cable with one hand, and hold the tester with the other hand, besides, we should touch each pin with the probe in sequence, if the pin is linked, the separated capacitor will reduce the audio frequency. After that, we will do the same test to the other terminal.   (View)

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