Circuit Diagram

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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Computer Mainboard Circuit 440BX_39

Published:2011/6/26 21:23:00 Author:zj | Keyword: Computer Mainboard, 440BX_39

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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

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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Computer Mainboard Circuit 440GX_23

Published:2011/6/26 20:45:00 Author:zj | Keyword: Computer Mainboard, 440GX_23

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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

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Computer Mainboard Circuit 440GX_22

Published:2011/6/26 20:50:00 Author:zj | Keyword: Computer Mainboard, 440GX_22

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Computer Mainboard Circuit 440GX_21

Published:2011/6/26 20:51:00 Author:zj | Keyword: Computer Mainboard, 440GX_21

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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

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Computer Mainboard Circuit 440GX_20

Published:2011/6/26 20:52:00 Author:zj | Keyword: Computer Mainboard, 440GX_20

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Computer Mainboard Circuit 440GX_19

Published:2011/6/26 20:55:00 Author:zj | Keyword: Computer Mainboard Circuit 440GX_19

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Computer Mainboard Circuit 440GX_18

Published:2011/6/26 20:56:00 Author:zj | Keyword: Computer Mainboard, 440GX_18

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The practical precise adjustable power supply

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

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Computer Mainboard Circuit 440GX_17

Published:2011/6/26 20:57:00 Author:zj | Keyword: Computer Mainboard, 440GX_17

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Computer Mainboard Circuit 440GX_16

Published:2011/6/26 20:57:00 Author:zj | Keyword: Computer Mainboard, 440GX_16

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Adjusting W317 stabilizer from zero

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

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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Computer Mainboard Circuit 440GX_15

Published:2011/6/26 21:01:00 Author:zj | Keyword: Computer Mainboard, 440GX_15

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Computer Mainboard Circuit 440GX_14

Published:2011/6/26 21:02:00 Author:zj | Keyword: Computer Mainboard, 440GX_14

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Computer Mainboard Circuit 440GX_13

Published:2011/6/26 21:03:00 Author:zj | Keyword: Computer Mainboard, 440GX_13

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The medical call receiver circuit with lighting signals

Published:2011/6/15 21:11:00 Author:Borg | Keyword: call receiver, lighting signals

In the figure is a receiver that can avoid leaving out the sound of asking for help, in the daytime, only the receiver works and the lights automatically cut off. At night, the receiver and the lights can be sent out with the request of the patients. When the calling key is pressed, the primary stage of transformer X1 is also connected with the AC power supply at the same time, and after being rectified and filtered, the power supply of the second stage outputs a DC voltage which is delivered to the collecting electrode of VT1 by R1. If it is the daytime, due to the rays, LDR1 is in a low resistance, VT1 is conducting, and the collecting electrode is reduced to the earth connection.   (View)

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Computer Mainboard Circuit 440GX_12

Published:2011/6/26 21:05:00 Author:zj | Keyword: Computer Mainboard, 440GX_12

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