power supply circuit

Multi-Control Four Switch Circuit

Published:2011/4/21 20:19:00 Author:Robert | Keyword: Multi-Control, Four Switch

Multi-ControlFour Switch Circuit is shown below:   (View)

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INA103 Adjustable Offset Voltage Circuit

Published:2011/4/21 8:01:00 Author:Robert | Keyword: Adjustable Offset Voltage

INA103 Adjustable Offset Voltage Circuit is shown below:   (View)

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Microcomputer system power supply monitoring integrated chip MAX690A／692A

Published:2011/4/21 4:34:00 Author:Nicole | Keyword: Microcomputer system, integrated chip, power supply monitoring

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Circuit example of regulated power supply adding overvoltage protection

Published:2011/4/21 4:04:00 Author:Nicole | Keyword: regulated power supply, overvoltage protection

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Regulated power supply circuit without transformer

Published:2011/4/21 4:27:00 Author:Nicole | Keyword: regulated power supply, transformer

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Walkman external power circuit without AC noise

Published:2011/4/21 4:28:00 Author:Nicole | Keyword: Walkman, external power, AC noise

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Pocket switch power supply charger circuit

Published:2011/4/21 3:56:00 Author:Nicole | Keyword: switch power supply, charger

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Common regulated power supply

Published:2011/4/21 4:37:00 Author:Nicole | Keyword: regulated power supply

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Common mobile phone battery charger circuit BQ2057

Published:2011/4/21 4:39:00 Author:Nicole | Keyword: mobile phone battery, charger

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Common mobile phone battery charger circuit(BQ2057)

Published:2011/4/21 4:40:00 Author:Nicole | Keyword: mobile phone battery, charger

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The most simple and practical switching power supply circuit diagram

Published:2011/3/30 22:12:00 Author:Ecco | Keyword: most simple, most practical, switching

Simple switching supply circuit diagram with a triode:   (View)

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High and stabilized voltage circuit diagram with photocoupler

Published:2011/3/30 22:48:00 Author:Ecco | Keyword: photocoupler, High voltage , stabilized voltage

The circuitry is shown as chart. The drive tube need to adopt a transistor which can bear higher pressure(the drive tube is 3DG27). When output voltage enlarges, the bias of V55 raises, the forwarddirection current of the light-emitted diode in B5 will rise, and the voltage in the electrode of photosensitive tube minishes, the bias of regulator tube decreases while the internal resistance increses, then make the output voltage stable.   (View)

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Ni-Cd storage battery with 6v12v／2A automatical charging equipment

Published:2011/4/21 1:20:00 Author:Nicole | Keyword: Ni-Cd storage battery, charging equipment

This automatical charging equipment can ensure the storage battery has a good process of charging, it also can prevent overload. It has three charging methods: standard charging, sustainable(microflow )charging and fast charging, they have differences in charging current and cuting the process of charging.   (View)

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TOSHIBA AG series rear-projection TV supply circuit diagram

Published:2011/3/30 23:22:00 Author:Ecco | Keyword: rear-projection TV

TOSHIBA AG series rear-projection TV supply circuit diagram is as below:   (View)

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Photoelectricity logic circuit

Published:2011/4/13 9:18:00 Author:Nicole | Keyword: photoelectricity logic circuit

Q1, Q2 phototransistor is illuminated about 1076.4 lx(100feet one candle), Q3 output is zero. When a or two phototransistors is no illumination, Q3 output is positive or 1. This circuit can be used as electro-optical logic exciter of power device.   (View)

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6.5V reference power supply circuit

Published:2011/4/14 6:46:00 Author:may | Keyword: 6.5V, reference power supply

This circuit can make DC voltage UV always stay at about 6.5V and has no reference to time and environmental temperature. Its main technical data: Steady output voltage: UN=6.5±5% V Output load current: IL=0~0.3mA Input voltage (supply voltage) : U1=19~54V Input current Ii (stable current Ia) : Ii＝Ia≈2mA Output resistor: dUN/dIN=r0=20Ω, maximum 50Ω Voltage-regulation coefficient: dUN/dUI=a=3×10-6, maximum 3×10-5 When the range of environmental temperature is 0~70℃, the average temperature coefficient of reference voltage: SAV=-100~+140μV/grd, typical value +67μV/grd Long term stability after working 100 hours: <1mV/1000 work hour Environmental temperature: θu=0~70℃   (View)

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100v／10mA regulated voltage power supply circuit

Published:2011/4/20 1:17:00 Author:muriel | Keyword: 100v, 10mA, regulated voltage power supply circuit

Thecircuit has two functions that areno-load protection and shorttime short-circuit protection. If you want to allow short-circuit fora long time, it must increase the PCM of theresistance R1 and R2, such as R1=1.2KΩ, 20W; R2=220Ω, 4W. The main technical data: output voltage:U2=100V output current:I2=10mA input voltage:U1=120V~180V Radiator thermal resistance:Rthk=20grd/W output voltage variable quantity: When input voltage U1=120V~180V and nominal load, ΔU2=1V When input voltage U1=120V~180V andno-load, ΔU2=1.5V When output current I2=0mA~10mA (U1=constant), ΔU2=1.5V ambient temperature θu=0°C~60°C, ΔU2=150mV/grd   (View)

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Frequency modulation type switching stabilized voltage supply 2

Published:2011/4/19 4:02:00 Author:May | Keyword: Frequency modulation, switching, stabilized voltage supply

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Reference voltage source using complementary transistors

Published:2011/4/14 6:44:00 Author:may | Keyword: Reference voltage source, complementary transistors

The characteristic of this circuit is shown in the following table ( RL=68kΩ) reference voltage source adopts BJT adopts complementray transistor voltage-regulation coefficient △U2/U1 ( enviromental termeprature θu=20 ℃) 1.2×10-4 4×10-5 variation of voltage reference △U2[when △U1/U1=(20±10)% and θu=20℃] 520μV 180μV variation of voltage reference when the temperature rise from 20℃ to 100℃ 9.6mV 10.8mV output resistor <15Ω input rated voltage U1 22V 22V   (View)

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Reference voltage source using operational amplifier

Published:2011/4/14 4:38:00 Author:may | Keyword: Reference voltage source, operational amplifier

The features of this circuit: 1 operational amplifier will not cause drift, voltage regulator tube have thecharacteristic of temperature compensation 2 the output voltage of pin 3 is very low, so, output current must higher than 10mA, it has no influence to voltage regulator performance and drift characteristic 3 choosing appropriately among R1、R2 and R4 can make the output voltage has a wider range (U3>U2) .   (View)

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