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Index 201

The linear stabilizer circuit of selectable output voltage composed of MIC5158

Published:2011/6/14 11:42:00 Author:Borg | Keyword: linear stabilizer circuit, output voltage

The linear stabilizer circuit of selectable output voltage composed of MIC5158
The simple constant current source circuit, in which MIC5158 is the controller, is shown in the figure. The output current of this circuit is mainly decided by the 35mV reference power supply voltage in MIC5158 and the external current limiting resistor Rs, their relation is I0=35mV/Rs. (View)

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The self-adapted adjustable stable power supply composed of LM317

Published:2011/6/14 20:23:00 Author:Borg | Keyword: self-adapted, stable power supply

In the figure is the self-adapted adjustable stable power supply composed of LM317. This power supply has LM317 as the power supply steady element, according to the voltage value, it self-shifts the circuit input voltage, by which it reduces the difference between the input voltage and output voltage, so the power consumption of the power supply is reduced. In the circuit, VT2, VD5, VW, R5, R6, C10 and the relay K compose the self-adapted shift circuit, when the output voltage V0 is lower thant 14V, VW is blocked because of the breakdown voltage is too low, and there is no current in it, VT2 is blocked, K is still, and the connector K-1 is closed, the second-stage AC current of 14V is linked to the stable circuit. (View)

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The voltage stable power supply used in microprocessor drive

Published:2011/6/14 21:58:00 Author:Borg | Keyword: power supply, microprocessor drive

The voltage stable power supply used in microprocessor drive
Figure (a) is the microprocessor circuit which consists of LT1587-3.45. Figure (b) is the adjustable output voltage stable power supply which consists of LT1585. Figure (C) is the microcomputer which consists of LT1584 and LT1431. The output circuits of LT1584,LT1585 and LT1587 are 7A,4.6A and 3A, which are suitable for the stabilizer which drives the microprocessor, and they characterizes high-speed passing reaction, the loading adjustment ratio is 0.5%, there are the protection circuits in them. The basic application circuit is very easy, when stabilizing the output voltage, just connect a capacitor on the input terminal and output terminal respectively. (View)

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The special power supply circuit(7905,7805 and 7812)

Published:2011/6/15 0:08:00 Author:Borg | Keyword: power supply

The special power supply circuit(7905,7805 and 7812)
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The temperature compensation positive/passive symmetric stable power supply (7812、F007C)

Published:2011/6/15 1:54:00 Author:Borg | Keyword: temperature compensation, stable power supply

The temperature compensation positive/passive symmetric stable power supply (7812、F007C)
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The practical precise adjustable power supply

Published:2011/6/15 2:00:00 Author:Borg | Keyword: adjustable power supply

The practical precise adjustable power supply
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Adjusting W317 stabilizer from zero

Published:2011/6/15 23:19:00 Author:Borg | Keyword: stabilizer

Adjusting W317 stabilizer from zero
One of the differences between this circuit and W317 basic application circuit is that there is a team of passive voltage affiliated power supply in the circuit. The voltage on the stabilizer pipe DW positive pole to the earth is -1.25v, the lower terminal of the voltage adjusting potentiometer is not connected with the earth but with the positive pole of the pipe, the output voltage of the stable power supply is still got from the part between the output pole and earth of the 3-terminal stabilizer. So when the resistance of W is regulated to 0, the 1.25v voltage on R1 offsets the -1.25v voltage on DW, which makes the output voltage be 0v. (View)

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The 1.25v~37v adjustable power supply composed of LM317

Published:2011/6/15 22:54:00 Author:Borg | Keyword: adjustable power supply

In the figure is the 1.25v~37v adjustable power supply circuit, which is a typical application cirucit of the adjustable 3-terminal stabilizer, it characterizes good functions, stable working, small size and simple installation, its maximum output current is 1.5A and its output voltage ranges from 1.25V to 37V. The circuit is suitable for experiment power supply.In the figure, C3 is used to filter to wave on RP, so that the stability of the power supply voltage is raised. Due to some reasons, when the output terminal and input terminal of LM317 are short, C2 will break the chip by releasing power in LM317, and VD6 can provide a discharging circuit for C2. (View)

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The +5V stable power supply with functions of current expanding and over-voltage protection(7805)

Published:2011/6/14 23:57:00 Author:Borg | Keyword: power supply, current expanding, over-voltage protection

The +5V stable power supply with functions of current expanding and over-voltage protection(7805)
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The serial port dynamic state scanning display circuit

Published:2011/6/26 22:33:00 Author:Borg | Keyword: serial port, dynamic state, display

The serial port dynamic state scanning display circuit

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The +5V and +12V circuit formed by 2 cells

Published:2011/6/27 22:23:00 Author:Borg | Keyword: +5V, +12V, cells

The +5V and +12V circuit formed by 2 cells
Generally, the portable electronic products powered by battery is working in a low voltage, which can reduce the number of the cells and the size of the product. Conventionally, the working voltage is 3~5V, to assure of the stability and precision, the power supply is expected to be stable. If 5V working voltage is adopted by the circuit, another higher working voltage is needed, which baffles the designer. The text is introducing a circuit composed of 2 step-up modules to solve this problem. (View)