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0-28V 6-8A Power Supply (LM317, 2N3055) This is an easy to make power supply which has stable, clean and regulator 0-28V 6/8 Amp output voltage.  By using two 2N3055 transistors we become more than 2 times the amount of amps then the power supply delivers, making it real though to brake ;).  Although you could use this design to deliver 20 amps   (with almost no modifications and with a proper transformer and a huge heat sink with a fan) , I did not needed such much power.  Make sure you mount them on a huge heat sink, as the 2N3055 transistors can get very hot at full load.  

0-30 VDC Stabilized Power Supply with Current Control 0.002-3 A Copyright of this circuit belongs to smart kit electronics.  In this page we will use this circuit to discuss for improvements and we will introduce some changes based on original schematic.  This is a high quality power supply with a continuously variable stabilised output adjustable at any value between 0 and 30VDC.  The circuit also incorporates an electronic output current limiter that effectively controls the output current from.   __ Designed by www.smartkit.gr

0-30V 20A High Power Supply with LM339 This is High current and Adjustable Volt 0 to 30V 20A.  It easy circuit and nice circuit, Because use IC LM338 and IC 741.  Volt Output adj by VR1-1K. IC LM338 to hold heat-sink.  Transformer is 20A up.  

12 VDC: 120 VAC Inverter Schematic This Inverter takes 12 volt DC and steps it up to 120 volt a.  c.  The wattage depends on which transistors you use for Q1 and Q2, as well as the "Amp Rating" of the transformer you use for T1.  This inverter can be constructed to supply anywhere from 1 to 1000   (1 KW) watts__ Global Village Institute for Appropriate Technology

12 Volt 20 Amp Power Supply A 12 Volt high current 20 Amp power supply.  The output voltage is variable from 12.2 Volt to 14.4V so can be set for any device requiring voltage and current in that range.  This PSU uses an LM723 as the regulator, 4 parallel connected outboard pass transistors and has current limiting above 25 amps __ Designed by Andy Collison

12 Volt DC to 120 Volt AC Inverter This Inverter takes 12 volt DC and steps it up to 120 volt a.  c.  The wattage depends on which transistors you use for Q1 and Q2, as well as the "Amp Rating" of the transformer you use for T1.  This inverter can be constructed to supply anywhere from 1 to 1000   (1 KW) watts __ Designed by Aaron Cake

12 volt Inverter-Very Basic type This circuit will provide a fairly stable "Square Wave" Output Voltage.  Frequency of operation is Mainly determined by the 220 uF Feedback Caps.  Currently about 60 Hz.  Various "off the shelf" transformers can be used. __ Designed by G.L. Chemelec

12-240V Inverter This vibrator inverter provides 240VAC at 60W from a 12V battery __ Contact: blehack @ yahoo dot com

12kv Power Supply If you need about 12, 000 volts DC for an ion generator this circuit might be the ticket.  It draws power from the 120vac power line but it uses a small 6KV camera flash trigger coil.  The output signal is isolated from the power line. . . Circuit by David Johnson P.E.-March, 1999

12V Fluorescent Inverter This is a low-cost project for 20 or 40 watt fluorescent tubes.  However the most efficient is to use a 40 watt tube   (or two 20 watt tubes in series).  It's a circuit you can put together from junk box components or build from a kit.  It's very simple to build and requires no printed circuit board __ Contact: Collin Mitchell

12VDC to 120VAC Inverter This Inverter takes 12 volt DC and steps it up to 120 volt a.  c.  The wattage depends on which transistors you use for Q1 and Q2, as well as the "Amp Rating" of the transformer you use for T1.  This inverter can be constructed to supply anywhere from 1 to 1000   (1 KW) watts __ Designed by Aaron Cake

2 Amp Power Supply This handy power supply has an output of 0v to 12v at 700mA with a transformer that is rated at 1-amp   (such as M-2155) or 1.4amp for a transformer that is rated at 2-amp   (such as M-2156).  Your local electronics shop or model railway supply will have these __ Contact: Collin Mitchell

300ma DC-to-AC Converter This circuit was used to provide battery backup to a device that had an AC   (output) wall transformer.  Due toquasi-sine-wave output and imprecise 60Hz output frequency, some devices might not work properly.  Peak output isDC input voltage minus about 20  __ Designed by Andrew R. Morris

40A Power Supply Unit Capable of running at full power at 100% duty cycle.  

500W Low cost 12V to 220V inverter Using this circuit you can convert the 12V dc in to the 220V Ac.  In this circuit 4047 is use to generate the square wave of 50hz and amplify the current and then amplify the voltage by using the step transformer.   __ Designed by Ashad Mustufa

555 DC-AC Inverter This DC-to-AC inverter schematic produces an AC output at line frequency and voltage.  The 555 is configured as a low-frequency oscillator, tunable over the frequency range of 50 to 60 Hz by Frequency potentiometer R4.  The 555 feeds its output   (amplified by Q1 and Q2) to the input of transformer T1, a reverse-connected filament __ Designed by Tony van Roon  VA3AVR

6 to 12 Volt Converter This circuit can provide up to 800mA of12V power from a 6 Volt supply.  The circuit is simple, about 75% efficient and quite useful __ Designed by Aaron Cake

A 12 volt Inverter-Very Basic type This circuit will provide a fairly stable "Square Wave" Output Voltage.  Frequency of operation is Mainly determined by the 220 uF Feedback Caps.  Currently about 60 Hz.  Various "off the shelf" transformers can be used. __ Designed by G.L. Chemelec

AC to DC Power Supply, Non-Isolated Off-Line This compact efficient circuit can provide up to 100ma of a regulated 5 volts from an AC power source ranging from 20vac to 120vac . . . Hobby Circuit designed by David Johnson P.E.-July, 2006

Bidirectional Power Inverter 08/02/01  EDN-Design Ideas If you want to swap charge in either direction between unevenly loaded positive and negative battery buses, you need an inverting dc transformer.  One implementation is the symmetrical flyback converter shown in Figure 1.  The circuit Design by Tom Napier, North Wales, PA

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characteristics of CMOS Logic Inverter Amplifiers This chart shows some of the measured characteristics of three different unbuffered CMOS logic gates, used as voltage amplifiers . . . Hobby Circuit designed by Dave Johnson P.E.-February, 2002

Circuit converts 5V to –10V 26-May-05 EDN-Design Ideas Switched-capacitor circuit doubles, inverts dc source__ Circuit Design by Ken Yang, Maxim Integrated Products Inc, Sunnyvale, CA

Circuit converts DAC's outputs from single-ended to differential Mode 8-Jun-06 EDN-Design Ideas This design suits low-end ac applications or high-precision level-setting applications that rely on a single-ended current-output DAC__ Circuit Design by Liam Riordan, Analog Devices, Limerick, Ireland

Circuit makes Simple Circuit high-voltage inverter 27-May-04 EDN-Design Ideas A simple high-voltage MOSFET inverter solves the problem of driving a high-side MOSFET, using a low-voltage transistor, Q1, and a special arrangement involving D6(Figure 1).  This inverter is much faster than those that optocouplers drive, so dead-time problems are minimal.  The inverter has the usual blocking diodes D4 and D6, and the parallel diodes D5 and D8__ Circuit Design by Francesc Casanellas, Aiguafreda, Spain

Circuit Makes Universal VCSEL Driver 10-Jul-03 EDN-Design Ideas VCSELs (vertical-cavity surface-emitting lasers] are commercially available infrared semiconductor lasers with λ≅850 nm.  Short-cavity-length, high-quality Bragg mirrors impart properties to VCSELs that differ from those that earlier__ Circuit Design by Andrzej Wolczko, Institute of Electronics AGH, Krakow, Poland

Classic Plus & Minus DC Power Supply This is a classic example of a regulated DC power supply that produces both a positive 15v and a negative 15v from a 20vac wall adapter. . . Circuit by Dave Johnson P.E.-October, 2005

CMOS inverters convert RF to digital signal 01/05/06 EDN-Design Ideas Hex-inverter-based design suits frequencies up to180 MHz__ Circuit Design by Francis Rodes

CMOS Logic Inverter Amplifier characteristics This chart shows some of the measured characteristics of three different unbuffered CMOS logic gates, used as voltage amplifiers. . . Circuit by David Johnson P.E.-February, 2002

Convert 5V to –10V 05/26/05  EDN-Design Ideas witched-capacitor circuit doubles, inverts dc source__ Circuit Design by Ken Yang, Maxim Integrated Products Inc, Sunnyvale, CA

Convert DAC's outputs from single-ended to differential Mode 06/08/06  EDN-Design Ideas This design suits low-end ac applications or high-precision level-setting applications that rely on a single-ended current-output DAC__ Circuit Design by Liam Riordan, Analog Devices, Limerick, Ireland

DAC Fine-Tunes Reference Output 08/25/11  EDN-Design Ideas Adding a DAC and op amp makes a precision adjustable reference.  Data converters must have a stable reference voltage to accurately measure or generate analog signals.  Such references offer many guaranteed levels of precision and stability.  Their variety of output-voltage levels is much smaller, which manufacturers specify as standard values, such as 2.048, 2.500, or 4.096V.  You sometimes need to dynamically calibrate the reference, fine-tune its output value, or generate a slightly different value.  For instance, when you measure a voltage with a resistive divider, you could adjust the reference voltage to compensate for an error in the divider__ Circuit Design by Fons Janssen, Maxim Integrated Products, Bilthoven, Netherlands

DC/AC inverter (1) This is the circuit which outputs 100 V of the alternating current from the input of 12 V of the direct current.  It is convenient to use the equipment which works in the alternating current using the battery (DC12V) of the car. __ Designed by Seiichi Inoue

DC/AC inverter (2) On this page, I will explain DC/AC invertor with center-tapless transformer.  As for the DC/AC invertor with center-tap transformer, refer to "DC/AC invertor (1) ".  The invertor that I made this time uses power MOS FET as swtching device.  I assum that this unit is used with the battery of car.  So, the input voltage is +12V DC.  The output voltage is AC 100V. __ Designed by Seiichi Inoue

Fluorescent Inverter This is a low-cost project for 20 or 40 watt fluorescent tubes.  However the most efficient is to use a 40 watt tube   (or two 20 watt tubes in series).  It's a circuit you can put together from junk box components or build from a kit.  It's very simple to build and requires no printed circuit board __ Contact: Collin Mitchell

Fluorescent Lamp Inverter This inverter is very easy to construct, reliable, and even powerful enough to light up a 15W florescent tube (if you cool your transistor well).  The only hard-to-find piece of this baby is the so-called yellow inverter transformer.  It's a miniature high frequency transformer that has a 25mm x 20mm x 5mm ferrite core, 30 turns of primary, 15 turns of feedback, and 250 turns of secondary all concentric, wound on plastic frame than wrapped with a 'yellow' adhesive tape.  If you can't find it in your local electronic shops then search for old portable rechargeble florescent lanterns since they have at least one yellow inverter.  Of course you can wind a handmade transformer which would do the same but it is a very difficult task when you don't have an original to inspire and it will still need an appropriate ferrite core. __

High-Quality Stereo Digital-to-Analog Converter, Part 3 The final article this month shows you how to assemble the various modules for the Stereo DAC into a low-profile steel case.  We also tell you how to get the remote control working and how to customise the configuration.___ SiliconChip

High-Quality Stereo Digital-To-Analog Converter, Pt.1 Are you listening to CDs via your DVD player? Does your DVD player have average sound quality or worse, cause buzz and hum problems when hooked up to your hifi system? Either way, you need this high-quality Stereo Digital-To-Analog Converter (DAC) to get first class sound and zero hum.___ SiliconChip

High-Quality Stereo Digital-To-Analog Converter, Pt.2 Last month, we introduced our new high-quality Stereo Digital-To-Analog Converter (DAC) and described the circuit.  This month, we show you how to build the various modules and make the header cables.___ SiliconChip

High-Voltage Inverter 05/27/04  EDN-Design Ideas A simple high-voltage MOSFET inverter solves the problem of driving a high-side MOSFET, using a low-voltage transistor, Q1, and a special arrangement involving D6 (Figure 1).  This inverter is much faster than those that optocoupler__ Circuit Design by Francesc Casanellas, Aiguafreda, Spain

Inverter generates a negative supply in a battery circuit for split power supply circuits. __ Contact: P. Townshend EduTek Ltd

Inverter 12 volt unit Mos-Fet Design A Very Reliable, Efficient and Practical Design.  Do Not ask how to Build this for Power ratings over 1000 watts, That is NOT Practical. __ Designed by G.L. Chemelec

Inverters to power fluorescent lamps from Low voltage DC This is a collection of non-intelligent (at least for now) inverter circuits for operating fluorescent or other similar devices from low voltage DC power sources.  These designsmostly obtained by reverse engineering commercial camping lanterns, power inverters, and the likeare all very basic circuits which use simple oscillators, easy to obtain or construct transformers, and common power semiconductors. __ Designed by © © 1997 Samuel M. Goldwasser

Isolated Miniature AC/DC Power Supply This circuit uses a novel approach to produce a fully isolated and regulated 5 volts @30ma from the 120vac power line.  It uses two tiny SCRs that alternately discharge two capacitors through a miniature high frequency transformer . . . Hobby Circuit designed by David A. Johnson P.E.-June, 2000

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Make a Universal VCSEL Driver 10-Jul-03 EDN-Design Ideas VCSELs (vertical-cavity surface-emitting lasers] are commercially available infrared semiconductor lasers with λ≅850 nm.  Short-cavity-length, high-quality Bragg mirrors impart properties to VCSELs that differ from those that earlier__ Circuit Design by Andrzej Wolczko, Institute of Electronics AGH, Krakow, PolandJuly 10, 2003

Make Simple Circuit High-Voltage Inverter 27-May-04 EDN-Design Ideas A simple high-voltage MOSFET inverter solves the problem of driving a high-side MOSFET, using a low-voltage transistor, Q1, and a special arrangement involving D6(Figure 1).  This inverter is much faster than those that optocouplers drive, so dead-time problems are minimal.  The inverter has the usual blocking diodes D4 and D6, and the parallel diodes D5 and D8__ Circuit Design by Francesc Casanellas, Aiguafreda, Spain

Micro Inverter A simple low-power inverter circuit is described here, which converts 12V DC into 230V AC.  It can be used to power very light loads like night lamps and cordless telephones,but can...___ Electronics Projects for You

Miniature Isolated AC/DC Power Supply This circuit uses a novel approach to produce a fully isolated and regulated 5 volts @30ma from the 120vac power line.  It uses two tiny SCRs that alternately discharge two capacitors through a miniature high frequency transformer.  The voltage spikes produce. . . Circuit by David A. Johnson P.E.-June, 2000

MOSFET, Inverter 12 volt unit A Very Reliable, Efficient and Practical Design.  Do Not ask how to Build this for Power ratings over 1000 watts, That is NOT Practical. __ Designed by G.L. Chemelec

Non-Isolated Off-Line AC to DC Power Supply This compact efficient circuit can provide up to 100ma of a regulated 5 volts from an AC power source ranging from 20vac to 120vac. . . Circuit by David Johnson P.E.-July, 2006

Plus & Minus DC Power Supply This is a classic example of a regulated DC power supply that produces both a positive 15v and a negative 15v from a 20vac wall adapter . . . Hobby Circuit designed by David Johnson P.E.-October, 2005

Power inverter is bidirectional 08/02/01  EDN-Design Ideas If you want to swap charge in either direction between unevenly loaded positive and negative battery buses, you need an inverting dc transformer.  One implementation is the symmetrical flyback converter shown in Figure 1.  The circuit__ Circuit Design by Tom Napier, North Wales, PA

Simple  Low-Power Inverter Here is a simple low-power inverter that converts 12V DC into 230-250V AC.  It can be used to power very light loads like window chargers and night lamps, or simply give...___ Electronics Projects for You

Simple Circuit but Powerful DC to AC Converter This circuit is very simple less than 12 component, to build DC to AC converter.  The principle of this circuit is generating 50/60Hz frequency by IC CD4047 and the output complement pin 10 and 11 of IC CD4047 to drive MOSFET IRFZ 44 so induction __

Simple Circuit converts 5V to –10V 26-May-05 EDN-Design Ideas Switched-capacitor circuit doubles, inverts dc source__ Circuit Design by Ken Yang, Maxim Integrated Products Inc, Sunnyvale, CA

Simple Circuit High-Voltage Inverter 05/27/04  EDN-Design Ideas A simple high-voltage MOSFET inverter solves the problem of driving a high-side MOSFET, using a low-voltage transistor, Q1, and a special arrangement involving D6 (Figure 1).  This inverter is much faster than those that optocoupler__ Circuit Design by Francesc Casanellas, Aiguafreda, Spain

Simple Circuit Inverter This circuit will provide a fairly stable "Square Wave" Output Voltage.  Frequency of operation is Mainly determined by the 220 uF Feedback Caps.  Currently about 60 Hz.  Various "off the shelf" transformers can be used. __ Designed by G.L. Chemelec

Universal VCSEL Driver 10-Jul-03 EDN-Design Ideas VCSELs (vertical-cavity surface-emitting lasers] are commercially available infrared semiconductor lasers with λ≅850 nm.  Short-cavity-length, high-quality Bragg mirrors impart properties to VCSELs that differ from those that earlier__ Circuit Design by Andrzej Wolczko, Institute of Electronics AGH, Krakow, Poland

Very Basic 12 volt Inverter This circuit will provide a fairly stable "Square Wave" Output Voltage.  Frequency of operation is Mainly determined by the 220 uF Feedback Caps.  Currently about 60 Hz.  Various "off the shelf" transformers can be used. __ Designed by G.L. Chemelec

Voltage Inverter This circuit inverts the polarity of the input.  output is limited to less that 200mA. __ Designed by Andy Wilson

Voltage Inverter using 555 Timer Simple and inexpensive circuit can produce a dual (positive and negative) voltage from a single supply input, extremely useful for powering OpAmp and other circuits that require a dual voltage from a single battery. __ Designed by Aaron Cake

DC to AC Circuits:   #B       CN        MZ