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Index 202

The absolutely available switch power supply: Hitachi A1PM8C power supply

Published:2011/6/10 1:14:00 Author:Seven | Keyword: power supply, power supply

Oscillating process:After full-wave rectification, the 220V AC voltage is converted into a DC voltage of 300V on C906, and then the voltage is imposed on 3-pin of IC901 after it has run through the L1 coil of T901, in the meantime, the 220V is being half-wave rectified, then it is added to the 2-pin of IC901 by R942, R903 and R904, and the internal switch pipe of IC901 is starting to be conducting, besides, the current in L1 of T901 is rising, a positive feedback voltage in sensed in the coil L2, and this voltage is imposed on the 2-pin of IC901 by Q901, D905 and L907, so that the internal switch of IC901 is saturating quickly.During the time of saturating, on the one hand, L2 coil is charging C905 by R906 and R907. (View)

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The absolutely available switch power supply: Kaige 4C7108 power supply

Published:2011/6/10 1:15:00 Author:Seven | Keyword: power supply, Kaige

The 5-pin is the power supply pin of TDA8380. The external C530, which is linked by the 10-pin, and the internal circuit, they both form a sawtooth wave oscillator. 6-pin links with an external R522, and the set parameter current provides charging/discharging current of C530, so the oscillator frequency of TDA8380 is decided by R500 and C530, the frequency of this machine is 34KHZ. The forward/backward motivating current, which is output by 1-pin and 15-pin of TDA8380, is delivered to the B pole of switch pipe Q502, so that Q502 is in the working state. It's to stop Q502 quickly to use backward motivation. (View)

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The absolutely available switch power supply: Jinxing D2902 power supply

Published:2011/6/10 1:15:00 Author:Seven | Keyword: power supply, Jinxing

The oscillating process of switch circuitsThe 9-pin of STR-S6708 the power supply lead, and only when 9-pin is normally supplying power, does the thick film work normally.The VD908 is directly rectified on 220V AC current, and then it is limited by R903 and R917, and filtered by C909. After that, it becomes a DC current of about 8V and is imposed on 9-pin of IC901, so IC901 starts to work, and the switch power supply begins oscillate. Though the energy of the voltage, which is rectified by VD908, is low and can't keep IC901 normally working, when the power supply starts to oscillate, the V2-pin of switch transformer T901 is launching a voltage. (View)

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The absolutely available switch power supply: Jinxing C7458 power supply

Published:2011/6/10 1:16:00 Author:Seven | Keyword: power supply, Jinxing

C7428 power supply is designed with wide voltage, which can adapt to the grid voltage of 110v-245v, and it is like the Toshiba 2500XH. The shift circuit of the gridTo adapt to the grid voltage of 110v-245v, the circuit is designed to be able to shift double rectification/bridge rectification. When the voltage is lower than 145v, it shifts into double rectification; when the voltage is higher than 145v, it shifts into the bridge rectification. After the voltage, which is input by the grid, is low-pass filtered, it is firstly rectified by V801 and V802 and C808 gets a recognizing voltage, then the voltage is imposed on the 2-pin and 5-pin of STR81145. (View)

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The Samsung 75DFhe755DF display diagram

Published:2011/6/10 1:07:00 Author:Seven | Keyword: display diagram

The Samsung 75DFhe755DF display diagram
(View)

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The digital controlled constant flow source

Published:2011/6/10 1:04:00 Author:Seven | Keyword: constant flow source

This is a digital controlled constant flow source of battery charging, which is designed by me. D/A converter outputs a voltage to the same polarity of the downside, the current in the circuit is I=Uad, it is fixed with sampling resistance, and two PORTs are used to connect the + and - poles. The upside transporting circuitry is connected as a amplifier circuit of 1/4 times, which is used to test the voltage of the battery. In the figure, 3dd13 and 3dd15 are the adjusting pipes. Please give me some suggestions. (View)

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the hand-made MP3 player circuit and its data

Published:2011/6/10 1:18:00 Author:Seven | Keyword: hand-made, MP3 player

the hand-made MP3 player circuit and its data
(View)

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The radio circuit of the frequency LCD display (2)

Published:2011/6/10 1:08:00 Author:Seven | Keyword: radio circuit, frequency LCD display

The radio circuit of the frequency LCD display (2)
(View)

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The chat transfer device of collinear phones (1)

Published:2011/6/10 1:04:00 Author:Seven | Keyword: chat transfer, collinear phones

The chat transfer device of collinear phones (1)
(View)

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The chat transfer device of collinear phones (2)

Published:2011/6/10 1:10:00 Author:Seven | Keyword: chat transfer, collinear phones

The chat transfer device of collinear phones (2)
(View)

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The circuit of a new type of electric mouse killer

Published:2011/6/10 1:27:00 Author:Seven | Keyword: electric mouse killer

It is said that mice are sensitive to magnetic field, which is why common high-voltage girds have bad effects on killing mice. The mice killer in the text has no high voltage ordinarily, so it won't cause the warning of mice, however, once mice touched the grid, the grid would generates a high voltage and kill the mice quickly. See as the figure, 1B is a separating and boost transformer. As the grid takes the earth as a pole, to prevent the mains protector from mistaking actions, the transformer is separated from the mains circuit. (View)

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The portable phone wire distributor

Published:2011/6/10 1:19:00 Author:Seven | Keyword: phone wire, distributor

The portable phone wire distributor
MCK100 (View)

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The principle diagram of IC reader/writer

Published:2011/6/10 1:11:00 Author:Seven | Keyword: principle diagram, IC reader/writer

This is a IC card and its reader/writer circuit, in which the reader/writer consists of a MPU, key board, display, supervision circuit and so on. The IC card is X76F100Y of XICOR. 2.1 the IC and its connectorX76F100 is a secure series FLASH E2PROM of 128*8 bit, of which either of the reader code and encoder code is 64 bit. The package pin of the smart card is as shown in Figure 2. The chip is packaged on a card, and the card is inserted into the connector of the IC reader, then the reader/writer and fulfills functions of encodeing, checking, saving,withdrawing and so on. (View)

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