Variable Power Supply With Digital Control Project

Here we present a variable power supply with digital control that is simple and easy to construct. I am in an OJT (On the Job Training Scheme). 2 or AURDINO nightly. Power Supply Electronic Kits & Modules. The High Voltage Power Supply Unit (HV PSU) The HV PSU measures 165mm x 105mm x 60mm and weighs 650g. Programmable DC Power Supplies DC power supplies provide a regulated DC output to power a component, a module, or a device. 7 Use a transistor to control the DC voltage output of the variable supply unit. 9V DC wall transformer (CUI) 3. Note that all these links are external and we cannot provide support on the circuits or offer any guarantees to their accuracy. Arduino controlled bench power supply. Thus the digital clock was constructed and results were obtained. Use this link for more information on Power Supplies in our Learning Center. The second variable supply is not shown in detail on the schematic because it is a carbon copy of the first one. Digital On/Off control for low standby power Power supply sequencing and hot-swap control Programmable soft-start profile Power supply history logging and fault management Output voltage margining Current fold back control Load sharing and balancing Regulation reference adjustment Compensation network control and adjustment. This model is then employed in the Introduction: Simulink Control page in order to demonstrate how to employ Simulink to design and simulate the control for a system. SITOP power supply highlights An efficient power supply is a basic requirement for operating any plant, no matter the industry or need. To process the digital inputs, a D/A converter will be used, while a combination of a speed sensor and F/V converter will be used to sense and convert the speed into an appropriate voltage. A bench power supply is an extremely handy bit of kit to have around for electronics hobbyists, but they can be expensive when purchased from the market.



Now here is a very simple circuit of short circuit protected regulated power supply utilizing. DC can only be used for power - but it's great for when you want to connect your Arduino and leave it plugged in for a long term project. Digital DC Power Supply Variable Adjustable Lab. My question is, how can I regulate the current? I would like to use this power supply for other things from time to time like charging batteries, and electrolytic rust removal, so a selectable current is important. Variable Bench Power Sup ply With LCD and Monitor Display 153. A cooling thermostat would cut on above 71° and off at 68°. dc variable power supply for sale - 4992 dc variable power supply wholesalers Online Uninterruptible Power Supply With DSP Digital Control from Wholesalers Buy cheap (YK-AD3KW)0-30V,0-100A Variable Power Products Name:High-current switch-mode DC. A diode (D4) to power a 14V LED panel light is attached to one of these supplies to indicate DC power on/off. If you are planning to build a 0 to 12 volt DC power supply unit for your work bench, this article may specifically help you. You should work on a surface where you don't mind if solder drops or scratches are made with tools and component leads. ELECTRONIC CIRCUIT DESIGN-I INTERNATIONAL ISLAMIC UNIVERSITY, ISLAMABAD DEPARTMENT OF ELECTRONICENGINEERINGFACULTY OF ENGINEERING AND TECHNOLOGYIntroduction: Our project is the power supply of the trainer. Using the switch-mode power supply (SMPS) of your personal computer,. Includes extensive computer-aided circuit simulation and power supply control. 2Vdc to 33Vdc. A current-limiting circuit is often needed to protect the most expensive parts of the circuit from transients such as current spikes, which occur when a power supply is driving a large capacitive.



PWM is a technique where the duty cycle of the semiconductor switch is manipulated to control power. DALI control gear – immediate dimming: HOT(3/7) › DALI arc power levels range from 1-254 › BCCU dim levels range from 1-4095 › Dimlevel[] is a look-up table (LUT) which converts DALI arc power level to its equivalent BCCU dim level – LUT is automatically generated by DALICG02 APP when BCCU apps exist in project. I'm interested in building a variable bench power supply for powering my small electronics projects. It is a vitally important part that delivers power to components that comprise the computer system. Here we present a variable power supply with digital control that is simple and easy to construct. The AC input power can be single phase or three phases. With technical support groups available worldwide, Chroma can provide automated test systems and the fabrication of test fixtures simultaneously at multiple locations across the globe. To find the right high-power supply for your needs, get your Power Products Selection Guide. Power For Your Electronics Projects تحويل بورسبلاي الكومبيوتر الى مجهزقدرة How to convert ATX power supply to Bench Jual Power Supply Variable. This means it has six variable resistors (potentiometers) built in for individual electronic control. 5mV and offer various protections like : shortcircuit protection and overload protection. Random circuits. Variable Voltage Power Controls - 120 or 240 Volt Solid State. The only time you lose features is if you are using an MTH AC power supply (with bell and whistle buttons) without using the TIU and remote and switch to a DC power supply when not using the TIU and remote(as Joe said just running the trains on straight track power with no digital control via the TIU and remote) then you will not be able to. Power Supplies and Control Schematics and Tutorials - +/-12V -> +/-5V Power unit, +12V/-12V Power supply unit, +30V DC-DC converter, +30V power supply with +5V, +5V Switching regulator (1), +9V *and* -9V from one battery, 12 Vdc - 120 Vac Inverter Schematic, 12 volt battery monitor, 12 Volt DC Load Control and Battery Protection, 12 volt power supply, 12B Battery condition indicator, 12V 30A.



It started with idea to build decent device that includes BOTH hardware and software features that can be found in professional equipment. to support the microcontroller. SinCos is a microprocessor controlled power supply for turntables with a synchronous motor. Build own Digital Power supply start with Hiland 0-28V 0. These tracks never require more then 15 volts so this power supply is ideal. This article describes a rather nice solution for building a current- and voltage- controlled benchtop power supply using a DC supply in the range of 20-30 volts and some additional down-regulation circuitry, with current and voltage control provided by an AVR microcontroller in a feedback loop. The project digital DC motor speed controller illustrates the use of digital inputs to control the speed of a dc motor. 5V by using potential divider circuit, since our Arduino can only read voltages from 0-5. Electronics hobbyist or who is interested in electronics design their own power supply unit using common variable IC regulator LM317 with selective rotary switch for output they need. of electrical devices. Browse our Computer Products, Electronic Components, Electronic Kits & Projects, and more. 5 to 15V Regulated Power Supply. The idea is to use the PWM outputs of the Arduino to control the voltage output of a power supply. By using this Arduino Variable timer relay we can control high voltage electrical appliances or electronic devices. This is a bench power supply with regulated DC outputs -12V, -15V, +5V, +12V, +15V, and variable and one +35VDC unregulated output. It adjusts from about 3v to 24v: and has the added feature that you can limit the maximum output current. Variable DC power supplies are AC to DC power supplies with a variable DC output. On an average everything should cost about 50 dollars not including shipping charges.



Increase the voltage to 14. Simply multiply that variable by the products wattage spec and then add an additional 10-15% on top of that in order to not overdrive the power supply. Aligned Energy is seeking to be on the front lines of this movement, with new investors and a series of projects to add capacity in major data center markets. We posted 20 various types of power supply circuit and counting. Build own Digital Power supply start with Hiland 0-28V 0. Here we present a variable power supply with digital control that is simple and easy to construct. Power Supply Design. com like short proof variable power supply, stabilized power supply with short circuit indicator, Universal digital power supply, variable switching power supply etc. 0 to 24 Volt 4Adjustable Power Supply #1: 0-24V4A adjustable power supply, text in Finnish. All DME pumps are designed to operate at 100-240 V AC, 50/60 Hz while the standard models for North America are supplied with a power cable and mains plug that connect to a standard 120 V, 60 Hz power supply. Hardware: Arduino Uno, Power supply (5v), 100uF capacitor (2 pieces), button (2 pieces), 1KΩ resistor (3 pieces), 16*2 characters LCD, 2N2222 transistor. 00 POWER SUPPLY AC/DC–VARIABLE Rugged general purpose supply offer-ing either AC or DC variable outputs of 0-25V @ 0-5 amps. A power supply unit (PSU) is the component that supplies a computer with the right amount of electrical power. 30Volts at up to 10Amps, I have decided it was time for an upgrade. Variacs | Variable and adjustable voltage transformers. Variable Power Supply with Digital Control.



IMPORTANT! This power supply is not intended for powering sensitive electronics such as surveilance cameras. The other one I am using to create a portable power station for my desk. With the advent of current regulated power supplies, remote setting of the output voltage and current became more desirable. 0 and later engines; for each locomotive, nearly two dozen functions are available at the touch of a single, clearly-labeled button. A bench power supply is a really practical tool when it comes to circuits. Now it lives on my desk, ready to power most small projects I'm working on. Here we present a variable power supply with digital control that is simple and easy to construct. This general purpose power supply can e used for supply output voltages from 1 to 35V. The 317 is a monolithic integrated circuit with adjustable 3-terminal positive-voltage regulator designed to supply more than 1. This project is about a stereo audio amplifier using two LM386 ICs with digital volume control for both. You don't need the high wattage resistor or the battery or solar panel or the relay!. The only establishing needed would be to calibrate the meter. This variable power supply with digital control circuit is built around an adjustable 3 terminal positive voltage regulator among other components. The installing contractor needs only to connect the line power supply to the VFD. There are easier ways to get a simple power supply like this one (re-using a wall-wart, for instance). ABOUT SCR CONTROLLED VARIABLE DC POWER SUPPLIES. As I am not an industrial level expert so this project is just about a digital DC power supply of small range(5V-12V).



A Digital DC Power Supply (programmable bench power supply unit), hardware version 3. Here we present a variable power supply with digital control that is simple and easy to construct. dc variable power supply for sale - 4992 dc variable power supply wholesalers Online Uninterruptible Power Supply With DSP Digital Control from Wholesalers Buy cheap (YK-AD3KW)0-30V,0-100A Variable Power Products Name:High-current switch-mode DC. Power supply kits. It just makes life simpler and testing ideas much quicker. Get it now on Amazon. This is invaluable when (for example) you power-up a project for the first time or soak-test a piece of equipment. projects for students. The former solutions are in general open source with limited feature set and. Make a simple oscillator 6. The switch mode power supply is the core of your control cabinet - and Murrelektronik's regulated power supply units are the perfect regulators. They can also be used to provide control voltages for variable-gain amplifiers. learn how to design a 5v dc power supply, 9 v dc power supply or 12 v dc power supply with block diagram & circuit diagram of dc power supply. I was given a task to make a Arduino controlled voltage variable power supply whose outputs can be switched between several preset values using pushbutton control. TRIAC Dimming: Triode for alternating current (TRIAC) dimming is used to control high-voltage dimmable power supplies such as Magnitude Dimmable Power Supplies. 5A current so can builds to easy with PCB layout, adjustable voltage VR1,VR2.



• Pre-installed rack ears and 1U rack size for convenient rack mounting. Increasing citizen engagement in a decentralized and participatory system of governance, coupled with digital decision tools, such as e-government fostering more transparency, spell greater accountability for politicians and managers of critical infrastructure providers. The Tenma 72-10480 is an affordable single output DC power supply unit offering an adjustable 0-30V voltage output, alongside a 0-3A current output. Electronic Circuit Schematics. To indicate the time duration and status 16×2 LCD display is included in this design, once the program uploaded to the Arduino then it can work independent with some external battery power source. I have built many circuits in my life, but this is actually the first time I've built a power supply circuit from scratch. Power Supply Electronic Kits & Modules. 0-60V Dual Variable power supply circuit using LM317&LM337 Hobby Electronic Projects Power supply momenameJanuary 2, 201332 Dual output power supply, LM317, LM337, Variable DC Power Supply If you want Dual Variable power supply circuit that covers most applications. Digital control for power supply of a transmitter with variable reference Abstract: RF power amplifiers can save much energy if they are supplied with a variable voltage as described in the state of the art. The News, Circuits and Designs cover Instrumentation, Test and Measurement, Power Electronics, Industrial Automation, Embedded Microcontroller. Aligned Energy is seeking to be on the front lines of this movement, with new investors and a series of projects to add capacity in major data center markets. There is LCD display in this circuit which will show the actual value of power supply output. Based on lm 317 + lm358. Here we present a variable power supply with digital control that is simple and easy to construct. We design various type of power supply circuit like regulated power supply, digital control power supply, universal power supply etc. Whatever adjustable power supply styles you want, can be easily bought here. Here, the innovative group of Dreamlover Technology design and verified a universal power supply circuit with the facility of digital control. AC/DC Power Supplies have both AC and DC outputs for connection to different loads. ELECTRONIC CIRCUIT DESIGN-I INTERNATIONAL ISLAMIC UNIVERSITY, ISLAMABAD DEPARTMENT OF ELECTRONICENGINEERINGFACULTY OF ENGINEERING AND TECHNOLOGYIntroduction: Our project is the power supply of the trainer.



Behlman manufactures a broad line of AC Power supplies and Frequency converters with available power from 1,000 VA to 120,000 VA in both single-phase and three-phase output. This dual polarity power supply is easy to build, requires few parts, and is adjustable from 0-15 volts. 0 as well as the USB-C variation by providing different ports such that the different USB standard cords can be used to power devices. 2 - The PWM output is referenced to PIC supply voltage If this is a school project I think the idea is to use the precision and the temperature stability of LM317 to build a digital controlled voltage source , both ideas have the same lack , if you multiply (first case) or add (the second case) an imprecise value to a precise value you will. Power Monitoring and Control. Potentiometer R2 sets the output voltage to the desired value by adjusting the reference input. Input up to 20V AC from a transformer or power pack. Such a time-consuming work. The National datasheets for the LM317 regulator series shows such an application, however the output voltage is set for both the positive and negative regulators using a ganged dual pot. Which you can adjust output voltage in a wide range between 0V to 50V, and a current at least 3A. • All connections to the inverter, especially the supply and control connections, may carry a lot of interference and must be fitted with suitable protection components. Introduction:- The most frequently used device in electronic workshops and laboratories is a universal power supply that Variable Power supply with digital control. Free discharge fan performance, motor power versus airflow 80 60 40 20 0 0 20 40 fan and m otor power, % airflow, % 60 80 100 100 1-speed motor 2-speed motor variable-speed motor Supply fan capacity control methods in a multiple-zone VAV system have. Power Supply Electronic Kits & Modules. A power supply can be considered truly complete only if it has facilities for a continuously variable voltage, short, current, and over load protection and the output is perfectly regulated and stabilized.



Spec: Powerful Piezo Driver and Large Bell Diameter For Projection Range Up To One Mile 2 Modes Talk And Siren For Indoor/Outdoor Use Variable Volume Control Ergonomic Pistol Grip And Light Weight Chasis USB Input to Play Your Music And Recordings Power Output 50 Watts Powered By 8 X C Batteries, Not Included Dc 12v 2. This general purpose power supply can e used for supply output voltages from 1 to 35V. You don't need the high wattage resistor or the battery or solar panel or the relay!. I just bought my first 0-18V 5A power supply last month and I am already searching for one with higher voltage of 50V and up. Variable Bench Power Sup ply With LCD and Monitor Display 153. They are the start mechanism that sets an electrical process in motion. A dedicated GSM modem with SIM card is required for each energy meter. Building your own power supply is fun and using it throughout your constructional projects is the reward of your achievement. Here is a simple and economical 10A variable power supply with 1. This method of power factor control is only practical for lightly loaded machines. Variable Voltage Power Supplies from our Electronic Kits & Modules range for industrial, professional, educational and hobby applications. The voltage output is varied by using the potentiometer VR1. 0-60V Dual Variable power supply circuit using LM317&LM337 Hobby Electronic Projects Power supply momenameJanuary 2, 201332 Dual output power supply, LM317, LM337, Variable DC Power Supply If you want Dual Variable power supply circuit that covers most applications. A proper electronically stabilized bench power supply unit is an important but also expensive device. However, because of some of the special features of an ATX, we can use it as a “smart” supply that’s even better.



With heavily loaded machines the power factor is normally reasonably high and the effect of voltage control is not significant. The LM317 is one of the most popular voltage regulators on the market, and for good reason. Along with ATmega328P, it consists other components such as crystal oscillator, serial communication, voltage regulator, etc. 5Amp please check the. This product also includes the ability to perform AC leakage testing and has a convenient adjustable power supply for soldering irons. With single phase AC input, the DC output ripple is very high (50%). Resistor network comprising of R1 and R2 connected in association to the pin1 (adj) is used to set the output. This means that with the power supply positioned within sight of a TV the gain can be adjusted easily for optimum picture quality. 0 to 30 Volt Lab Supply. Understand what to look for when selecting your LED power supply Understanding your LED lighting application is a good start, but determining the ideal power supply also requires a little more insight into the operation of LEDs before we can narrow down the choices available. Available in a wide range, these speed governors are perfectly configurable in order to meet any application's requirements. Critical production processes can only be maintained if a constant power supply of the necessary quality is available for the automation system. Choosing the right power supply for your application requires a good understanding of power supply specifications. BP17³ Preamplifier. 5-V reference and 5-V output span. 5 to 37 Volt regulated output with currents up to 30 Amps. AC-DC and DC-DC Programmable Power Supplies. ? Why DSP for Power Supplies?. Hardware: Arduino Uno, Power supply (5v), 100uF capacitor (2 pieces), button (2 pieces), 1KΩ resistor (3 pieces), 16*2 characters LCD, 2N2222 transistor. Based on lm 317 + lm358.



Electronic Circuit Schematics. 5 to 24V is mapped to 0-4. Input up to 20V AC from a transformer or power pack. 6 Use a variable resistor or potentiometer to create a variable voltage divider. Complete List Of Electronics Projects AF Amplifier With Digital Volume Control Based On TDA8551 Variable Dc Power Supply Pulse and Frequency. The only time you lose features is if you are using an MTH AC power supply (with bell and whistle buttons) without using the TIU and remote and switch to a DC power supply when not using the TIU and remote(as Joe said just running the trains on straight track power with no digital control via the TIU and remote) then you will not be able to. DC Power Supply Variable 60V 5A, 3-Digital LED Display, Precision Adjustable Regulated Switching Power Supply Digital with Alligator Leads US Power Cord for Repair, Lab Equipment, Research and DIY etc. 01 Hi, I'm looking to build my own DC Digital power supply. Motor leads, control power for auxiliaries, and communication lines are all factory wired. I understand there is a lot of content about this subject there isn't much detail on Arduino controlled PSUs. But the term digital power or digital power supply really refers to a power supply in which digital technology is used within the feedback loop and for control of the supply. Hence, only the particular range. Nearly all Panasonic microwave ovens now use an Inverter, and are always labelled with “Inverter” on the front. A power supply unit (PSU) is the component that supplies a computer with the right amount of electrical power. SwitchMode Power Supply Circuit 0-30 V 0-20 A. Digital control fundamentals. These lamps may be purchased at any automotive supply store and most Walmarts. Variable gain amplifiers (VGAs) adjust audio gain based on control voltage for amplitude modulation, level compression, and synthesizers.



If you're in the business of building projects and testing circuits regularly, acquiring a variable DC bench power supply is highly recommended. You may use the VAV as a standalone controller or connected to the Metasys® network through a Network Control Module (NCM) or Companion™ system. Advanced control possible (non-linear, multi-variable) Can perform multiple loops and "other" functions High bandwidth High resolution Easy to understand / use "relatively' low cost ?? + Analog Controller Digital Controller Power Elec. 05-Apr-2019- 0-24v 3A Variable DC Power Supply using LM338 Arduino Motor Control Arduino Projects Electronics Projects Diy Electronics Tattoo Power Supply Energy. Shop for benchtop power supplies including everything from economy linear DC power supplies to multi-output programmable power supplies. But the term digital power or digital power supply really refers to a power supply in which digital technology is used within the feedback loop and for control of the supply. Software: Atmel studio 6. This will allow you to set the voltage to a specific value depending on. Our focus is to provide consistant, constant output voltages for your system - independent of how much input voltage fluctuates. We offer a large selection of variable voltage and current regulated DC Power Supplies, which are also called bench power supplies, Lab Power Supplies, DC variable. Choosing the right power supply for your application requires a good understanding of how they are specified. Presented here is a circuit for 30V 10A variable bench power supply that offers variable voltage and current adjustment. The systems can be used to test PC/Servo/Telecom power supplies, adapters, chargers, backlight inverters, LED power drivers, UPS's, PV Inverters, and EV chargers. It just makes life simpler and testing ideas much quicker. SwitchMode Power Supply Circuit 0-30 V 0-20 A. Simple thyristor control of the supply voltage will be sufficient to provide the necessary voltage control to implement this scheme. Control method There are three basic methods to control a variable frequency drive: speed control to control the motor speed mainly with the analog voltage, position control to control the motor rotation amount with simple limit switches, a high accuracy encoder or others and torque control to control the current flowing into a motor for a constant torque value. At MACOM we design, manufacture, and support a family of Variable Gain Amplifiers (VGAs) for RF, microwave, and millimeter wave applications. e variable power supply circuit using lm317 the place you indicate 28v as input , how can i modified it to 12volt. How to wire digital dual display volt- and ammeter.



Kepco, an ISO 9001:2015 company, has been designing and manufacturing electronic power supplies, both modular and instrument type, since 1946. Engineering Projects For You; 1001+ Electronics Projects For You; SCR-Controlled EHT Power Supply. The only time you lose features is if you are using an MTH AC power supply (with bell and whistle buttons) without using the TIU and remote and switch to a DC power supply when not using the TIU and remote(as Joe said just running the trains on straight track power with no digital control via the TIU and remote) then you will not be able to. We offer an extensive range range of fixed, variable, dual polarity, symmetrical, DC-DC, positive and negative power supply and battery charger projects for industrial, professional, educational and hobby applications. How’s that if we combine universal power supply and a digital control technology. Variable Voltage Power Supply Circuit. the power supply unit. We tested the supply and controller so that you can grab your old laptop wall wart (output voltage between 14 and 20V), connect it to the supply's V. When the speed control of three phase induction motor is done by adding resistance in rotor circuit, some part of power called, the slip power is lost as I 2 R losses. of electrical devices. The micro:bit has 25 external connections on the edge connector of the board, which we refer to as ‘pins’. Volteq has three decades of design and manufacturing know-how in adjustable power supplies. Thyristor is used as a switch to control flow of power. These lamps may be purchased at any automotive supply store and most Walmarts. To some the term digital power supply may loosely refer to a power supply that uses switching technology, i. I was dreaming to make such a project where I can regulate the voltage using push button.



[Sylvain's] creation can regulate 0-25 volts while sourcing 0-5 amps. When the speed control of three phase induction motor is done by adding resistance in rotor circuit, some part of power called, the slip power is lost as I 2 R losses. Digital potentiometer definition. Power Supply. Uses industry popular LM317 in TO3 package for delivering variable output voltage. Build own Digital Power supply start with Hiland 0-28V 0. While this is true for low-power designs, most high-power analog designs will still need to use external gate drivers. I was given a task to make a Arduino controlled voltage variable power supply whose outputs can be switched between several preset values using pushbutton control. The potentiometer does not control the gain of the amplifier itself, but it creates a voltage divider network at the input, which in fact controls the fraction of the audio signal that is fed to the amplifier. Intelligent Power Supply Design Solutions 3 Whole Product Solution Power Supply Design Integration Levels Microchip delivers everything a power conversion design engineer needs: low-risk product development, lower total system cost, faster time to market, outstanding technical support and dependable delivery and quality. Power supply and power control circuit diagrams / circuit schematics. As shown in schematics the variable voltage of 1. The Tenma 72-10480 is an affordable single output DC power supply unit offering an adjustable 0-30V voltage output, alongside a 0-3A current output. The project digital DC motor speed controller illustrates the use of digital inputs to control the speed of a dc motor. This variable voltage is connected to pin A0 using. This is a high quality power supply with a continuously variable stabilised output adjustable at any value between 0 and 30VDC. Mastech has three decades of design and manufacturing know-how in variable voltage regulated DC power supplies. AC power control with thyristor using pic microcontroller is designed to control AC power flow across load. This is 0-24VDC digital PIC power supply circuit. Huge savings for variable voltage bench power supplies, fast shipping, and friendly service.



The circuit design was intended to create an adjustable power supply over a range of 1. Variacs | Variable and adjustable voltage transformers. The VCC pin outputs 200mA and could therefore conceivably power ten. 270 MINI ELECTRONICS PROJECT WITH CIRCUIT DIAGRAM. Assembled Hamuro Programmable 1-30V Laboratory Power Supply Laboratory Power Supply Requirement Power supply for electronic circuit experiments need some special features. Spec: Powerful Piezo Driver and Large Bell Diameter For Projection Range Up To One Mile 2 Modes Talk And Siren For Indoor/Outdoor Use Variable Volume Control Ergonomic Pistol Grip And Light Weight Chasis USB Input to Play Your Music And Recordings Power Output 50 Watts Powered By 8 X C Batteries, Not Included Dc 12v 2. It endeavors to provide the products that you want, offering the best bang for your buck. Build own Digital Power supply start with Hiland 0-28V 0. 16VA520T10 10A, Variable AC Voltage 129. Hardware: Arduino Uno, Power supply (5v), 100uF capacitor (2 pieces), button (2 pieces), 1KΩ resistor (3 pieces), 16*2 characters LCD, 2N2222 transistor. If a circuit has no power a circuit would not be able to perform its desired function. 7 Use a transistor to control the DC voltage output of the variable supply unit. The control system can control and monitor the power supply output voltage and current from virtually anywhere there is an Ethernet connection. 0-60V Dual Variable power supply circuit using LM317&LM337 Hobby Electronic Projects Power supply momenameJanuary 2, 201332 Dual output power supply, LM317, LM337, Variable DC Power Supply If you want Dual Variable power supply circuit that covers most applications. 5 to 15V Regulated Power Supply. They supply positive polarity (+Vcc) as well as negative polarity (-Vcc, not connected to ground!) and grou. Variable Power Supply With Digital Control Project.