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Variable Power Supplies, PAGE 1
Power Supplies -- Main Page
Variable Power Supplies:   # - F       G - -S         T - Z
Last Updated on: Tuesday, April 01, 2014 04:29 AM

Links to electronic circuits, electronic schematics, designs for engineers, hobbyists, students & inventors:
1A Variable Regulated Power Supply -  A 'must-have' for the experimenter.  (electronic design 05/09) [from Peter Parker's website]
231 Volt Dimmer -  Find out how to put together a simple but efficient PWM dimmer circuit for LEDs…. [REUK - Renewable Energy UK website]
3V supply delivers 12V p-p to piezo speaker -  16-Oct-03 Issue of EDN  Low-profile piezoelectric speakers can provide quality sound for portable electronic devices, but they require voltage swings greater than 8V p-p across the... [Design Idea by Royce Higashi and Tony Doy, Maxim Integrated Products, Sunnyvale, CA]
5V power supply teams low dropout regulator, charge pump -  8-Jan-04 Issue of EDN  Auxiliary power of 3.3V is replacing the 5V auxiliary power that "silver boxes" supply in most computer systems, but some circuits still require a 5V supply. Such systems impose the messy task of creating a central 5V auxiliary supply from the 3.3V auxiliary supply.... [Design Idea by Jim Christensen, Maxim Integrated Products, Sunnyvale, CA]

5V powersupply -  This circuit will regulate voltage to 5V input range is 6V..12V. The diode prevents the circuit being damaged when the input is connected the wrong way around. The resistor and LED are optionial, they are for power on indication....

Add gain to an absolute-value amplifier -  22-Aug-02 Issue of EDN  The absolute-value amplifier is a basic building block in test-and-measurement and signal-processing applications. The addition of a DPP (digitally programmable potentiometer] adds another dimension, G (gain], to this key circuit. Because the gain is programmable, you can use the circuit as an absolute-value amplifier (G&1] or an absolute-value attenuator (G>1].... [Design Idea by Chuck Wojslaw, Catalyst Semiconductor, Sunnyvale, CA]
ADE7758 Phase Dropout Detection for VAR Calculation -  AN-750 Analog Devices Application Notes....[App Note]
Adjustable Low-voltage Power Supply -  If you want to check the behaviour of an electronic circuit at low voltages, an adjustable power supply as shown here may be helpful. Powered from a 3 to 16 volts source (DC for sure), it will provide a stable output voltage in the 0 to 1.5 V range.….must register on this site.... [Published in Elecktor July/August 2010]
Adjustable power supply -  Schematic only, no circuit description
Adjustable Power Supply (Aaron Cake) -  well filtered variable1.2-30 volts at5 amps using LM338K (added 5/02)
Adjustable Power Supply using LM317 -  voltage regulator for1.2V to35-Volt output voltages and up to1A load  (added 11/05)
Adjustable Power Supply with Charger -  This power supply has adjustable and charger output. The charger circuit can be use for cellular phone. The adjustable output serves as multipurpose power supply. It can handle a 1 ampere current. The 317 must have a heat sink…. [Circuit designed by Milardo de Guzman]
Adjustable Step Up Voltage Regulator -  Find out more about a step up voltage regulator used to output a voltage higher than the input voltage…. [REUK - Renewable Energy UK website]
Adjustable Voltage Motor Controller -  One of the nice things about flying electric is you can test run your motor in the house, workshop, or in the yard and the neighbors won't complain. The problem is how to control the speed of the motor. One way is to use the plane, radio, and speed control with the motor in it. That's no fun!....(electronic circuit added 4/05)
Cascoded stack yields multiple Voltages -  03/16/00 EDN-Design Ideas  EDN is migrating links. This link is not verified.  Search the "title" + "EDN" for new link.
Circuit adds foldback current protection -  21-Jul-05 Issue of EDN  Enhance three-terminal regulator with foldback oversight.... [Design Idea by Rafael García-Gil and JM Espí, Electronic Engineering Department, University of Valencia, Spain; Edited by Brad Thompson and Fran Granville]
Constant Current Battery Charger -  A simple method of charging a battery from a higher voltage battery is shown in the circuit below to the left. Only one resistor is needed to set the desired charging current and is calculated by dividing the difference in battery voltages by the charge current. So, for example if 4 high capacity (4000 mA hour) ni-cads are to be charged at 300 mA from a 12 volt battery, the resistor need,.... [Bill Bowden's website]
Discrete LDO Voltage Regulator - Do you need a simple LDO voltage regulator, but an IC version that meets your needs is not available?  Make your own using this circuit.  The circuit in the drawing is the actual circuit that I built and used successfully to power a shortwave radio which I have since sold (with the power supply)...[Designed by Andrew R. Morris]
Dual Power Supply (albert kreuzer) -  Some brands of electrolytics have a small inductance which will cause the regulator ICs to oscillate. Use tantalum caps for C5/C6 to be sure (but also most normal electrolytics will work)….(electronic circuit added 4/05)
Dual power supply delivers 8A with no heat sinks -  03/30/00 EDN-Design Ideas....The circuit in Figure 1 is a high-current dual supply that provides 5 and 3.3V at currents as high as 8A. The circuit uses a fixed-frequency, two-output, current-mode synchronous-buck- controller....PFD contains several circuits, scroll to find this one.... [Design Idea by John Seago, Linear Technology Corp, Milpitas, CA]
Dual Regulated Power Supply-PSU -  In this circuit, the 7815 regulatates the positive supply, and the 7915 regulates the negative supply. The transformer should have a primary rating of 240/220 volts for europe, or 120 volts for North America. The centre tapped secondary coil should be rated about 18 volts at 1 amp or higher,allowing for losses in the regulator. An application for this type of circuit would be for a small regulated bench power supply.... [Circuit by Andy Collison]
Dual-voltage regulator meets USB-power needs -  19-Aug-04 Issue of EDN This Design Idea stems from the limited availability of IC voltage regulators that can meet key USB-power specs, coupled with the need for turn-on sequencing and rise-time control at each output. As always, for PC-related designs, minimum cost is a primary motivation. USB specs require all loads to limit inrush current to less than 100 mA plus 50 µC of charge when powered on.... [Design Idea by Wayne Rewinkel, National Semiconductor, Phoenix, AZ]
Easy Power Supply -  Electroinic circuit design…. [from Harry Lythall's website]

Variable Power Supplies:   # - F       G - -S         T - Z

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