Rongge

Description    This dual polarity power supply is easy to build, requires few parts, and is adjustable from 0-15 volts. It is great for powering op amp circuits, as well as other circuits that require a dual supply voltage. Circuit diagram Parts C1, C2 2200uF 35V Electrolytic Capacitor C3, C4, C5, C7 1uF 35V Electrolytic Capacitor C6, C8 100uF 35V Electrolytic Capacitor R1, R4 5K Pot R2, R3 240 Ohm 1/4 W Resistor BR1 2A 30V Bridge Rectifier U1 LM317 Adjustable Positive Regulator U2 LM337 Adjustable Negative Regulator T1 30V Center Tapped 2 Amp Transformer S1 SPST 2 Amp Switch MISC Heatsinks For U1 And U2, Line Cord, Case, Knobs For Pots, Wire Notes Since this project operates from 120 (or 220, or 240, etc.) volts AC, it MUST be built inside a case. U1 and U2 get quite hot and will require heatsinks. A fan is usually not needed. You can, of course, add a volt and amp meter. U1 and U2 can only go down to a minimum of +-1.2V. If you need to go lower, you can add two 1N4003 diodes...

Power supply circuit to generate output below were variations between 1.3V DC to 12.2V DC with 1A current. In addition, the power supply circuit is also equipped with over-current protection or shield against belebih flow. Power supply circuit is very simple, but the quality is quite good, made her basiskan regulator IC LM723 is a pretty legendary. Description: R2 to set the output voltage. The maximum current is determined by R3, over-current protection circuit inside the LM723 to detect the voltage on R3, if it reaches 0.65 V, the voltage output will be off her. So the current through R3 can not exceed 0.65 / R3 although output short-circuit in his. C3 and C4 are ceramic capacitors, as much as possible directly soldered to the PCB, this is because the LM723 is prone to oscillation that is not cool. LM723 works with 9.5V input voltage to 40 V DC and the LM723 can generate its own current of 150mA when the output voltage is not more than 6-7V under input voltage. Specifications: Output...

Desktop computer power supply - ATX type Delta Circuit diagram Click on the schematic to magnify

The objective of the circuit is to create a power supply that would produce an output of 0 V to 15 V at 1 A current. Terminology 2N3055 – a complementary Silicon Epitaxial-Base planar NPN transistor mounted in Jedec TO-3 metal case for use as power transistor Bridge Diode – also known as bridge rectifier which has four diodes arranged in a bridge configuration where the output voltage has the same polarity with either polarity of the input voltage Circuit Explanation The construction of this power supply circuit is very simple in such a way that the components used are easy to be located while the cost is very cheap. With the biggest provided current at 1 A, the output voltage is adjusted for minimal ripple effect and stabilized in the range of 0 V to 15 V DC. This is made possible by the standard transformer output of 1.5 A with a primary winding voltage of 220 V and secondary voltage of 18 V. The current is being limited by the Zener diode D1 with a rating of 18 V and 1.5 W. The li...

This is the Simple UPS Power Supply Circuit Diagram. This circuit is a simple form of the commercial UPS, the circuit provides a constant regulated 5 Volt output and an unregulated 12 Volt supply. In the event of electrical supply line failure the battery takes over, with no spikes on the regulated supply. Notes: This circuit can be adapted for other regulated and unregulated voltages by using different regulators and batteries. For a 15 Volt regulated supply use two 12 Volt batteries in series and a 7815 regulator. There is a lot of flexibility in this circuit. TR1 has a primary matched to the local electrical supply which is 240 Volts in the UK. The secondary winding should be rated at least 12 Volts at 2 amp, but can be higher, for example 15 Volts. FS1 is a slow blow type and protects against short circuits on the output, or indeed a faulty cell in a rechargeable battery. LED 1 will light ONLY when the electricity supply is present, with a power failure the LED will go out and outp...

This is a simple 0-50V 2A Bench Power Supply Circuit Diagram. I use the lm10 IC because it has a reference voltage and that’s useful for dc power supply. With two ICs can take different output voltage and amperage. This circuit is protected from short circuit.P2 is for controlling the current at the range of 0-2A. Stabilize the output voltage with R4 on negative pin on op-amp and with R2 & P1 on positive pin.  0-50V 2A Bench Power Supply Circuit Diagram  Op-amp output controls T1 that not let ripple of voltage.T1 increase or decrease ampere of R6 and control the voltage of T5 & T4. Pin 1 is the reference voltage and reference voltage is losing some voltage on R1 that has 100uA . This current passes through P1 too. Vlose p1=100uA*Rp1 This lose voltage regulate output voltage rate of output current is compare between reference voltage of P3 and lose voltage on R11.T3 is protecting short circuit with R11. For reduce out put voltage to 0v should parallel one resistor 470 o...

This is the simple circuit diagram of Dual Voltage Power Supply . It is used for Misc. application. This circuit is called regulated power supply. For this reason the main component of this circuit is Regulator IC. It also needs few components to built. The regulator 7812 is the positive voltage regulator and 7912 is the negative voltage regulator.  You can also use 7809 for 9 volt positive power supply and 7909 for negative voltage power supply. It regulates voltage from 24Volt to 12 Volt (DC). The transformer input is 110Volt to 220Volt (AC) and the output must be between 12Volt to 24Volt (AC) and current must be 500mA. In this circuit some capacitors are used as a filter for removing repole.

A common problem when an AC mains adapter is used to power a USB device is that the voltage does not match the nominal 5 V specified by the USB standard. The circuit shown here accepts an input voltage in the range of 4-9 V and converts it into a 6-V output voltage, which is then stabilized to a clean 5-V level by a series regulator. The combined boost/buck converter used here operates on the SEPIC principle. That principle is quite similar to the operating principle of the Cuk converter, but without the disadvantage of a negative output voltage.   Circuit diagram :   Stable USB Power Supply Circuit Diagram   The circuit is built around a MAX668, which is intended to be used as a controller for boost converters. The difference between a SEPIC converter and a standard boost (step-up) converter is that the former type has an additional capacitor (in this case C2) and a second inductor (in this case, the secondary winding of transformer L1). If C2 is replaced by a wire bridge and ...

This design uses 4 diodes in a bridge to produce a fixed voltage power supply capable of supplying 35mA. All diodes (every type of diode) are zener diodes. They all break down at a particular voltage. The fact is, a power diode breaks down at 100v or 400v and its zener characteristic is not useful. The current is limited by the value of the X2 capacitors and this is 7mA for each 100n when in full-wave (as per this circuit). We have 1u capacitance. Theoretically the circuit will supply 70mA but we found it will only deliver 35mA before the output drops. The capacitors should comply with X1 or X2 class. The 10R is a safety-fuse resistor. The problem with this power supply is the "live" nature of the negative rail. When the power supply is connected as shown, the negative rail is 0.7v above neutral. If the mains is reversed, the negative rail is 340v (peak) above neutral and this will kill you as the current will flow through the diode and be lethal. You need to touch the negati...

The Uninterrupted Power Supply in an IC . Cymbet Corporation announced the availability of the EnerChip™ CC CBC3105 smart solid state battery. The CBC3105 combines the award winning EnerChip battery with integrated input power conversion, battery management and regulated output capabilities. The Cymbet EnerChip™ CC is a smart rechargeable solid state battery Uninterrupted Power Supply (UPS in a Chip™) that provides power backup to microelectronic devices when main power fails. The EnerChip CC provides power supply monitoring and switches over to the internal solid state backup battery when the supply drops below a set threshold. The EnerChip CC product family can provide anywhere from several hours to several weeks of backup time.  Simple Uninterrupted Power Supply in an IC Circuit Diagram   The CBC3105 is an ideal solution for design engineers who need a compact device to back-up a Real Time Clock or Microcontroller during power failure where coin cell batteries or super ...

A novel supply voltage monitor which uses a LED to show the status of a power supply. This simple and slightly odd circuit can clearly show the level of the supply voltage (in a larger device): as long as the indicator has good 12 volts at its input, LED1 gives steady, uninterrupted (for the naked eye) yellow light. If the input voltage falls below 11 V, LED1 will start to blink and the blinking will just get slower and slower if the voltage drops further - giving very clear and intuitive representation of the supply's status. The blinking will stop and LED1 will finally go out at a little below 9 volts. On the other hand, if the input voltage rises to 13 V, LED2 will start to glow, getting at almost full power at 14 V. The characteristic voltages can be adjusted primarily by adjusting the values of R1 and R4. The base-emitter diode of T2 basically just stands in for a zener diode. Supply Voltage Indicator Circuit diagram: Supply Voltage Indicator Circuit Diagram The emitter-colle...

This is a Simple 12 Volt / 2 A Switching Power Supply Circuit Diagram. The circuit 12 volt / 2 A switching power supply in the above scheme is not too complicated. At the output of this block provides a stable 12 V and maximum current 2A. Power supply units are quite compact and is suitable for debugging schemes, as well as a permanent resource for stationary devices, including power for the logic electronics for the home-made ​​CNC machine tools. 12 Volt / 2 A Switching Power Supply Circuit Diagram      Transformer is available in the free market and avoids the hassle of having to self-winding. The diode bridge BR 1 of any given voltage and current of 2A. All other elements in the high part of the circuit are designed by the same voltage, taking into account the mains. The scheme of 12 volt / 2 A switching power supply operates from the high voltage network, to be observed when mounting accuracy and caution when using. It is desirable to block the finished board to “pa...

This Electronic Project 10A power supply circuit s based on the ISL8200M IC which require few external components and is very easy to build but is capable to offer a high power making it useful in current-sharing DC DC power supply module for those power hungry Datacom\Telecom\Servers. 10A Power Supply IC with ISL8200M: This power supply circuit accept a wide input voltage from 3 volts up to 20 volts at 10 A . The output voltage range can be set using a simple rsistor from 0.6 volts up to 6 volts . If we need more current is very easy to obtain using th ISL200M paralleling up to 6 modules , so the maximum output current can be in that case 60A .

L296 is a high current switching regulator that can provide up to 4 ampere current and its output voltage range is from 5.1v to 50v. For more information concern its datasheet. Power supply current can be adjust by changing the value of P1 pot. P2 and P3 pots are used to vary the output voltage. C7-C10 capacitors are used for input voltage filtering whereas C2-C6 are for output voltage filtering purpose.  Output voltage can be taken across X1-1 and X1-2 terminals or either X1-2 and X1-3 terminals. Note that the maximum input voltage of L296 is 50v so we have to step down ac voltage by using 50v 4amp or appropriate transformer. Don't forget to use heat sink for L296. Schematic: Final Assembly:   Components Required: R1,R3,       10kΩ  Resistor R2,            15kΩ  Resistor R4,            3.2kΩ Resistor R5(R6),     0.1Ω ...

This is a very simple dual USB power supply controller using the isl6185 USB power controller family. Dual USB power supply electronic project that provides fully independent overcurrent (OC) fault protection for two or more USB ports. Dual USB Power Supply Controller Circuit Diagram: This product family consists of sixteen individual functional product variants and three package options and is operation rated for a nominal +2.5V to +5V range and specified over the full commercial and industrial temperature ranges. Each ISL6185 type incorporates in a single package two 71mΩ P-channel MOSFET power switches for power control and features internal current monitoring, accurate current limiting and current limited delay to turn-off for system supply protection along with control and communication I/O. The ISL6185 family offers product variants with specified continuous output current levels of 0.6A, 1.1A, 1.5A or 1.8A. Due to all integrated features this power supply circuit is very easy to...

Each one of the devices must counter the amateur electronics store , an adjustable voltage direct current power source. I gave the circuit diagram below 1 volt and 40 -volt power supply, the output can be adjusted arasınada as miliamperle 5 amp maximum current is adjustable from 50 . 1-40 V, 50 mA - 5A Regulated Power Supply Circuit Diagram  In this way could be used for voltage source can also be used as a constant current source . Adjustable current limiting , since it is clear that the short-circuit protected . In this phase, on my testing of other circuits , and calibrations can be used successfully in conjunction with a digital voltmeter . Circuit held four transistors . Network isolation transformer , 220V primary and secondary of the power of 35 to 40 volts and 100 VA transformer should be . KBPC601 as a diode bridge ( 6A - 100V ) is sufficient. 4 6- amps instead of the bridge diode aperajlı or higher can also be used . Half- bridge diode and 2N3005 power transitörü do KBPC6...

Quickly find a reliable and cost effective a simple regulated 12 Volt power supply  Notes: This circuit above uses a 13 volt zener diode, D2 which provides the voltage regulation. Approximately 0.7 Volts are dropped across the transistors b-e junction, leaving a higher current 12.3 Volt output supply. This circuit can supply loads of up to 500 mA. This circuit is also known as an amplified zen-er circuit .  

There will be instances where the currents from each supply will be unequal. Where this is the case, the resistor divider is not sufficient, and the +ve and -ve voltages will be unequal. By using a cheap opamp (such as a uA741), a DC imbalance between supplies of up to about 15mA will not cause a problem. However, we can do better with a dual opamp (which will cost the same or less anyway), and increase the capability for up to about 30mA of difference between the two supplies. Circuit diagram: Dual Opamp Buffered Power Supply Circuit Diagram Author: http://sound.westhost.com/project43.htm

If you have ever worked with lasers, you know how fun and interesting it can be, you also know how expensive it can be. The high voltage power supplies for the laser tubes are often more expensive then the tubes themselves. This supply can be built with commmon parts, most of which you probably already have in your junk box. The secret is the transformer used. It is a common 9V 1A unit, connected backwards for step up.    Please note that some people may have trouble with this supply. This is due to the slight difference in transformers. For more information on LASER power supplies Schematic Parts Part Total Qty. Description Substitutions R1 1 10 Ohm 10W Or Greater Resistor R2 1 Ballast Resistor, See "Notes" D1, D2, D3 3 1N4007 Silicon Diode C1, C2, C3 3 0.1 uF 2000V Capacitor T1 1 9V 1A Transformer S1 1 115V 2A SPST Switch MISC 1 Case, Wire, Binding Posts (for output), Line Cord Notes 1. T1 is an ordinary 9V 1A transformer connecte...

The switching regulator power supply used LM2575-5.0 on this schematic. You can make the stable voltage by using the 3 terminal regulator like LM317. However, because the output electric current and the inputted electric current are the same approximately, the difference between the input electric power (The input voltage x The input electric current) and the output power (The output voltage x The output current) is consumed as the heat with the regulator. Because it is, the efficiency isn�t good. Data sheet for LM2575 SIMPLE SWITCHER 1A Step-Down Voltage Regulator http://www.national.com/pf/LM/LM2575.htm