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Using LM386 as low-power positive and negative regulated power supply circuit diagram

Published:2011/10/20 20:42:00 Author:Rebekka | Keyword: low-power, positive , negative , regulated power supply

Using LM386 as low-power positive and negative regulated power supply circuit diagram
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Output 15OV/100mA regulator circuit diagram

Published:2011/10/20 22:34:00 Author:Rebekka | Keyword: regulator circuit

Output 15OV/100mA regulator circuit diagram
The figure shows the output 150V/100mA regulator circuit. VT3 is the over-current protection circuit, when the output is in short circuit, VT3 protection circuit starts to work. The current in VT2 is controlled at 12OmA. At this time, it adds all the input voltage to the VT2 input voltage drain - source, the production loss is about 2OW. (View)

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Photocoupler high voltage regulator circuit diagram

Published:2011/9/26 1:34:00 Author:Rebekka | Keyword: photocoupler, high voltage regulator

Photocoupler high voltage regulator circuit diagram
It is the series regulator circuit, and the amplifier tubes need to use relatively high-voltage transistor, if it uses the good insulation characteristics of optical coupler between input and output, it will realize high-pressure control. In the (a) and (b) figures, they are the high-voltage regulator circuit with using optocoupler. In Figure (a), when the output voltage rises for some reason, the BG5 bias increases, light-emitting diode's forward current increases, so that the phototransistor collector junction voltage decreases. (View)

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12V simple regulator circuit diagram 3

Published:2011/9/26 21:17:00 Author:Rebekka | Keyword: simple regulator

12V simple regulator circuit diagram 3
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5V fixed voltage power supply circuit diagram with doubler rectifier

Published:2011/8/22 22:31:00 Author:Rebekka | Keyword: doubler rectifier , 5V , fixed voltage , power supply

5V fixed voltage power supply circuit diagram with doubler rectifier
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Constant current source circuit diagram ( with online calculator )

Published:2011/9/2 1:51:00 Author:Ecco | Keyword: Constant current source , online calculator

Constant current source circuit diagram ( with online calculator )
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Numerical control constant current source circuit diagram

Published:2011/9/2 1:58:00 Author:Ecco | Keyword: Numerical control , constant current source

Numerical control constant current source circuit diagram
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the absolutely useful switch power supply:the Kaige 4C7108 power supply(A4)

Published:2011/8/20 2:22:00 Author: | Keyword: absolutely useful , switch power supply

the absolutely useful switch power supply:the Kaige 4C7108 power supply(A4)

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Voltage Regulator Circuit Composed Of Zener Diodes

Published:2011/8/23 23:40:00 Author:Robert | Keyword: Voltage, Regulator, Zener, Diode

The picture shows the voltage regulator circuit composed of zener diodes. And, the picture (a) shows the circuit with output of 6V/50mA. Now it introduces the determining method of the each components in the circuit. The input voltage U is 10V~16V, and at this time the output voltage Uo=Uz-UBE. The transistor VT1's UBE is fixed which is about 0.65V. So the VS's stable voltage is Uz=6V+0.65V=6.65V. It could use the RD6.8EB1 zener diode.The picture shows the voltage regulator circuit composed of zener diodes.(a)The circuit with output of 6V/50mA. (b)The circuit which using LEDs to replace the zener diodes. (c)The circuit which using the resistance for voltage dividing. (d) The voltage regulator circuit which has the best performance. (View)

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Voltage Regulator Circuit With Auxiliary Power

Published:2011/8/23 23:40:00 Author:Robert | Keyword: Voltage, Regulator, Auxiliary, Power

Voltage Regulator Circuit With Auxiliary Power
The circuit shown in picture (b) can not stabilize well for the transient voltage. Because this transient voltage could be through the resistance R4 and add to the output port through the amplification of the adjustment tube. Also in the circuit shown in picture (b), the amplifier's power, which is the input voltage U1, is also not stabilized. So it could add the R4 directly to the power input port and make the amplifier's power stable, which is shown in picture (a). But in order to make the zener diode VS2 work normally in the circuit, it must make the adjustment tube VT1's tube voltage drop UCE larger than the VS2's working voltage. This would increase the VT1's power consumption. (View)

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Voltage Regulator Power Luoya Method Circuit

Published:2011/8/23 23:40:00 Author:Robert | Keyword: Voltage, Regulator, Power, Luoya, Method

Voltage Regulator Power Luoya Method Circuit
The picture shows the Luoya method circuit which is suitable for the 220V input. The picture (b) is suitable for 380V input. For example in the circuit shown in picture (a), the R1 is starting resistance. When the input voltage is connected, as the special difference of VT1 and VT2, if the VT1 is conducted firstly, the transformer T1 would process the field excitation and the VT1 would be conducted rapidly. If T1 is in the magnetic saturation mode, the VT1 would change to be disconnected. So the T1 would generate the opposing electromotive force which would be through the transformer's feedback winding to make VT2's base electrode get the positive bias voltage, so that it would be conducted. This repeated actions would make the transformer T1 magnetic flux have the continuous oscillation. (View)

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Voltage Regulated Power Chopper Method Circuit

Published:2011/8/23 23:40:00 Author:Robert | Keyword: Voltage, Regulated, Power, Chopper, Method

Voltage Regulated Power Chopper Method Circuit
1. Chopper method.The picture shows the chopper method circuit. This is a non-isolated conversion method whose conversion efficiency is beyond 85%. This method contains the buck type, boost type, and polarity inversion type.The picture (a) shows the buck type circuit. When the transistor VT1 is conducted, the U1 would be through VT1 to add onto the choke L1 and capacitance C1, thus it would provides the load power. When the VT1 is disconnected, the energy stored in L1 would be through the freewheeling diode VD1 to supply the load.The picture (b) shows the boost type circuit. When the transistor VT1 is connected, the choke L1 would store energy. (View)

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DC Voltage Regulator Power Circuit With Output Of 30V/0.2A

Published:2011/8/23 23:40:00 Author:Robert | Keyword: DC, Voltage, Power, Regulator, Output

The picture shows the DC voltage regulator power circuit with output of 30V/0.2A. In the circuit it connects the zener diode VS2 to the upside, thus it could make the differencial amplifier VT1 and VT2's collector and base electrode be in low-voltage mode when their output voltage is high. At this time in order to make the VT1 and VT2 still have adequate working point, it could make the differencial amplifier emitter electrode resistance R5's value be bigger. The differencial amplifier's output port is lead out from the VT2's collector electrode. This would make the circuit keep the negative feedback and have the voltage regulation function. (View)

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Voltage Regulator Circuit With Output Of 34V/500mA

Published:2011/8/23 23:40:00 Author:Robert | Keyword: Voltage, Regulator, Output

The picture shows the voltage regulator circuit with output of 34V/500mA. This circuit's maximum output voltage is determined by the operational amplifier A1's power voltage. When A1 uses the NJM5532 operational amplifier, its power voltage would be ±22V. So the maximum output voltage could be 44V. If there is some surplus capacity, the maximum output voltage could be about 40V. The VS3 is a zener diode. Its stable voltage could be selected to be about a half of the power voltage (18V). The R7, R8 and RP1 make up the voltage-divider circuit for the output voltage. And it selects the resistance value according to the principle that the divided voltage would be equal to the VS3's stable voltage. (View)

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DC Regulator Power Circuit With Short Circuit Protection

Published:2011/8/23 23:40:00 Author:Robert | Keyword: DC, Regulator, Power, Short Circuit, Protection

DC Regulator Power Circuit With Short Circuit Protection
The picture shows the DC regulator power with short circuit protection. The circuit uses the bistable circuit, which composed of VT7 and VT8, as the protection circuit. The R1 is the detecting resistance for the short circuit signal or over load signal. Its resistance value is very small. When it is working normally, there is low voltage drop on the R1, the VT8 is conducted and VT7 is disconnected, The VT3 is also disconnected. The protection circuit would not have action. When there is short circuit or overload, the R1's voltage would increase rapidly to make the VT8's base voltage increased to be disconnected. The VT8's collector voltage reduces and it would add onto the VT7's base electrode through the R15 and R16's voltage divider to make the VT7 conducted. So the VT7's collector voltage would increase to make the VD3 conducted. This would add the short circuit signal or overload signal to the VT3's base electrode to make its voltage increase to be disconnected. Thus it would protect the adjustment tube. (View)