power supply circuit

QUAD_POWER_SUPPLY

Published:2009/6/24 2:01:00 Author:May

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EXPERIMENTER’s_POWER_SUPPLY

Published:2009/6/24 2:00:00 Author:May

Passive linear IC regulators are used to make up a supply delivering +12, +9, +5, -5, -9, and -12 Vdc. T1 and T2 are 12-V, 3-A transformers.   (View)

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PULSE_WIDTH_MODULATED_LASER_SUPPLY

Published:2009/6/24 1:57:00 Author:May

IC1 initially provides drive for Q1 and HV transformer T1, and it rectifies D4 through D19. When the laser tube ignites, Q2 is triggered; this activates relay RL1, reducing the duty cycle. R13 controls the duty cycle of the pulses through the laser tube.   (View)

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__HIGH_VOLTAGE_TRIPLEN

Published:2009/6/24 1:53:00 Author:May

This tripler is useful for low-current and high-voltage applications.The capacitors can be 0.001-μF,3- to 6-kV discs,and the diode's 3-kV units,or three each IN4007 in series.   (View)

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KIRLIAN_DEVICE_SUPPLY

Published:2009/6/24 1:50:00 Author:May

This device is essentially a high-voltage variable-frequency ac supply.A CD4049 IC multivibrator circuit drives a darlington connected transistor pair,which drives TR2,an HV transformer.   (View)

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ac_OPERATED_HE_NE_POWER_SUPPLY

Published:2009/6/24 1:43:00 Author:May

T1 is a 120-V to 1000-V step-up 60-Hz transformer. C1, C2, C3, C4 and D2 through D5 form a voltage quadruplet. The initial voltage is 4 to 5 kV, which drops when the laser tube fires.   (View)

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NIGHT_VISION_SCOPE_POWER_SUPPLY

Published:2009/6/24 1:38:00 Author:May

This high-voltage power supply has an inverter around Q1 that supplies 150-V pulses to the converter of SCR1 and C2. The output of T2 is a 4.5-kV pulse that is multiplied by the voltage-tripler network (right) to produce 13.5 kV. T1 is a 3-kΩ to 500-Ω CT transistor audio transformer, T2 is a flash tube trigger transformer with a 6-kV secondary.   (View)

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FLUORESCENT_LAMP_12_V_SUPPLY

Published:2009/6/24 1:34:00 Author:Jessie

This high-voltage power supply can operate fluorescent tubes from a 12-V source, even if the tube has a defective filament. It essentially is an oscillator that excites a home-made autotransformer. T1 is wound on a ferrite rod 5/16 diameter by 1 7/8 long, in layers. S2 is an optional lamp filament switch.   (View)

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5_A_CONSTANT_VOLTAGE_SUPPLY

Published:2009/6/23 4:51:00 Author:May

This constant-voltage supply has a variable output.It can supply more than 5 A, and has two switchable current limits.   (View)

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TELEPRINTER_LOOP_SUPPLY

Published:2009/6/23 4:50:00 Author:May

A circuit to power a teleprinter, using transistors as current-controlling devices. The power supply used provides a constant current in a loop, normally 60mA or 20 mA, depending on the machine.   (View)

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Flyback Synchronous Rectifier Control Circuit of Adapter

Published:2011/7/13 7:51:00 Author:Michel | Keyword: Synchronous, Rectifier Control Circuit

With the development of consumer electronics, energy consumption rate in global electricity of its external power supply(adopter) is dramatically increasing which has been seen as a great energy consumption user.Take America as example, adapters consumes 300 billion degrees electricity per year and it is 11% of the entire country electricity.Today energy conservation and emission reduction is pervasive,at present all governments' regulations are more and more strict to exteral power supply.The United States energy star makes more strict regulations to the average efficiency for external power supply. Figure 1 shows the power efficency when the output voltage is lagrger than 6V.   (View)

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JUNKED_TRANSISTOR_REGULATORS

Published:2009/6/23 4:49:00 Author:Jessie

Old transistors can make excellent regulators. Simply use one as a Zener to control the base cur-rent to another transistor (Fig. 68-35A). If the pass transistor cannot supply enough current, you can use two pass transistors in its place (Fig. 68-35B).   (View)

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12_Vdc_REGULATED_SUPPLY

Published:2009/6/23 4:48:00 Author:Jessie

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5_V_LOGlC_REGULATOR_WITH_ELECTRONIC_SHUTDOWN

Published:2009/6/23 4:47:00 Author:Jessie

The circuit will shut down to 1.2 V under fault conditions.   (View)

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SIMPLE_dc_ac_INVERTER

Published:2009/6/23 4:46:00 Author:Jessie

This dc-to-ac inverter is based on the popular 555. A 555 oscillator circuit drives a buffer amplifier consisting of Q1, Q2, and Q3. The circuit operates at 150 to l60 Hz. T1 can be a 6.3-V or l2.6-V ffia-ment transformer as applicable. The frequency canbe changed by changing the values of R1 and/or C1.   (View)

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OP_AMP_AUDIO_MIXER

Published:2009/6/23 4:13:00 Author:May

This circuit will mix several audio signals to a common output.RF can be made 1 MΩ for 10 ×(20dB) or 100kΩ for unity gain.   (View)

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FAST_33_V_ADJUSTABLE_REGULATOR

Published:2009/6/23 4:12:00 Author:May

The adjustable version of the LT1585 makes it relatively easy to accommodate multiple microprocessor power-supply voltage specifications. To retain the tight tolerance of the LT1585 internal reference, a 0.5% resistor adjustment is recommended. R1 is sized to carry approximately 10 mA idling current (≤124 Ω), angl R2 is calculated from:   (View)

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The Numerical Control DC Regulated Power Supply Circuit 6

Published:2011/7/22 21:55:00 Author:Michel | Keyword: Numerical Control, DC Regulated Power Supply

The control DC regulated power supply circuit introduced in the example uses light touch buttons and digital integrated circuit to control the output low voltage of voltage regulation circuit.Its output voltage range is 1.5-30V.The circuit uses 20 reversible gears stepping control(stepping value is 1.5V).The low voltage gear is 1.5-15V(zero to ninth gear) and high voltage gear is 16.5-30V(tenth to ninth gear) and the output votage gear is indicated by LED digital display. Circuit's Work PrincipleThis control DC regulated power supply circuit is composed of voltage regulation circuit,control circuit and gear indication circuit and it is showed as the picture 5-25. Voltage regulation circuit consists of mains switch,S1,gear selector switch,S2a ,FU1-FU3,mains transformer,T, rectifier diode ,VD10,capacitor,C1-C7,voltage regulator IC,IC4 and resistor,RO.   (View)

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BUFFERED_REFERENCE_SUPPLY

Published:2009/6/23 4:45:00 Author:Jessie

This buffered reference (for 1.23 V or ntore) uses a supply voltage of greater than 3 V.   (View)

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dc_dc_CONVERTER

Published:2009/6/23 4:45:00 Author:Jessie

This low-power converter will supply about 100 mW of dc to a load and it is useful to isolate or derive dc voltages. It operates at around 200 kHz. L1 is wound on a 22-mm diameter x 13-mm high pot core with #32 magnet wire. The primary is 80 turns and the secondary is 80 turns (for 12-V nom-inal output). The two windings should be insulated for the expected voltage difference between in-put and output in insulation applications.   (View)

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