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Power Supplies:  DC to DC / Switch Mode and DC to DC Converters   Page 1
Boost,    Buck,    Buck-Boost,    Switchmode

Power Supplies -- Main Page           Converters -- Main Page
DC to DC:  #'s     A     B-C     D-F     G-K     L     M-O     P-R     S      T-Z
Last Updated on: Thursday, April 07, 2016 01:01 PM


Circuits Designed by Dave Johnson, P.E. :
  • 0.5V Negative Supply
    Although not very efficient, this simple circuit, consisting of two LEDs and a photo diode, generates a negative voltage with a current level of a couple milliamps.  It is ideal for supplying a negative rail to low power “rail to rail” op Amp circuits, which need to have a true zero volts output.  (added 12/04)


Links to electronic circuits, electronic schematics, designs for engineers, hobbyists, students & inventors:
.4 watt 100% Radio Shack DC-DC Converter -  This DC-DC converter ("inverter") needs nothing but unmodified Radio Shack parts. You don't need to build or wind any coils or transformers…....
‘Always on’ for PCs -  Many enthusiasts will be using their PCs as data loggers, controllers or as web servers. In these cases it is important that….must register on this site.... [Published in Elecktor July/August 2010]
+/-5V Power Supply Operation with TC7106A/7107A TC7106A/7107A -  Microchip Application Note Published 12-Nov-02....[App Note - ]
+30V Power Supply with +5V -  I made  power supply which makes about +30V with +5V power supply. Direct current is changed into  alternating current by  oscillator which used  schmitt trigger inverter which has  hysteresis....[Designed by Seiichi Inoue]
+5V Power Supply Circuit -  This circuit is a small +5V power supply, which is useful when experimenting with digital electronics. Small inexpensive wall....[Tomi Engdahl's design]

+9 Volt*and*  9 Volt from One Battery! -   MAX1044 is a charge pump converter it uses a capacitor as a "bucket" to pump charge from one place to anor. It can be used to generate negative voltage easily. (added 4/02)
±12V supply accepts 9 to 30V inputs -  12/04/97 EDN-Design Ideas....For applications that require symmetric supply voltages from a wide input range, the switch-mode supply in Figure 1 delivers more than 3.6W at �12V and operates from inputs of 9 to 30V. Over this input range, efficiency.… [Design Idea by Ron Young, Maxim Integrated Products, Sunnyvale, CA]
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0 to 300 Volt Adjustable Power Supply -  This is a simple circuit that can provide an adjustable voltage source of0 to330 Volts.  supply is short-circuit proof: current is limited to about100mA. (added 6/06)
0.2V Supply Voltage Nanopower Inverter Circuit -  Circuit Ideas for Designers Application Notes Advanced Linear Devices, Inc....[App Note - ]
0.2V Supply Voltage Nanopower Two-Inputs NOR & NAND gates -  Circuit Ideas for Designers Application Notes Advanced Linear Devices, Inc....[App Note - ]
0.2V Supply Voltage N-Channel Transmission Gate -  Circuit Ideas for Designers Application Notes Advanced Linear Devices, Inc....[App Note - ]
0.5v Negative Supply -  Although not very efficient, this simple circuit, consisting of two LEDs and a photo diode, generates a negative voltage with a current level of a couple milliamps.  It is ideal for supplying a negative rail to low power “rail to rail” op Amp circuits, which need to have a true zero volts output. …. [Designed by David A. Johnson]
1.3V Power Supply -  This is a replacement power source for 1.3V mercury cells or other small batteries. It has many uses and I use this circuit in my computer to power a front panel multi adapter which has a digital thermometer… [Aaron Cake's design]
10 Hints for using your power supply to decrease test time -  Agilent Application Note  (added 6/06)
10 Practical Tips You Need to Know About Power Products 5965-8239E -  Learn ten simple ways to improve your testing capabilities with your power supplies and electronic loads. Aligent Application Note  (App Note - added 2/06)
10-15w watt 100% Radio Shack DC-DC Converter -  This DC-DC converter ("inverter") needs nothing but unmodified Radio Shack parts. You don't need to build or wind any coils or transformers.…....
10A High Performance Point-of-Load DC/DC µModule -  DN385  Design Notes (Linear Technology)  (App Note - added 1/06)
1119 Simple Regulator Provides ±12 Volt from 5 Volt Source -  National Semiconductor Application Note 31 Aug2001 (App Note - added 7/02)
12 Volt 30 Amp Power Supply (Andy Collinson) -  uses a single 7812 IC voltage regulator and multiple outboard pass transistors, this power supply can deliver output load currents of up to30 Amps.... [Circuit Design by Andy Collison]
12 Volt Alarm Power Supply -  A 12 Volt power suppiled designed for Ron's Modular Burglar Alarm. However, being a popular supply voltage this circuit will have many other uses as well….(circuit / schematic design added 6/06)
12 Volt DC Power Supply  -  This is a simple low-cost 50W off-line switching power supply, which can be used for home projects or to learn operation of flyback converters. It can work over a universal AC line input range 90-264 VAC and provides a 12VDC output at more then 4A load. Line and load regulation is better then 0.5%. (added 11/07)
12 Volt Power Supply -  Please operate caution when building this power supply. It is run on standard 117 ac current and under  right circumstances 117 ac can kill you. Use a plastic enclosure if possible to decrease chances of short-circuiting. Don't use  power supply if it's wet, and never run it without  specified fuse.  (added 6/06)
12V 30A PSU -  uses a single 7812 IC voltage regulator and multiple outboard pass transistors, this power supply can deliver output load currents of up to30 Amps (added 10/09)
12V to +/- 30V DC to DC Converter  -  This is a DC to DC converter for car power Amplifier. 12V input generates +30V and -30V output for preamp or power Amplifiers. Circuit uses SG3525 IC, Mosfets and switching power supply…
12V to 28V DC-DC Converter with LM2585 -  This boost regulator is for those times when you have a 28v relay, but want to use it with a 12v source. The circuit is built around the National Semiconductor LM2585, and uses the energy stored in an inductor to boost the 12v to 28. Output voltage can be varied by adjusting the ratio of resistor values on the feedback pin. ….(design added 11/08)
12V to 9V Car Converter -  Car Converter for12 Volt to 9V …. [Tony van Roon's circuit]
12V to 9V with a LM317 -  This little circuit uses a LM317 variable voltage regulator to adjust the input voltage down to +9 volt, or whatever else you need. Just a solid basic circuit without bells and whistles.
You can do with a 10uF capacitor for C1 if your battery is close to this circuit. If it is located more than 3 feet increase the value to 100uF or above…. [Tony van Roon's circuit]
13.8 Volt, 20 Ampere linear power supply -  A semi-traditional power supply for communication equipment, using negative-rail regulation with grounded pass transistors in a configuration that gives some unique advantages. [Manfred Mornhinweg]
15V/ 28V 4A Transmitter Power Supply -  Power supply used for professional FM broadcasting transmitter. ….(electronic schematic added 11/08)
1A Variable Regulated Power Supply -  A 'must-have' for the experimenter.  (electronic design 05/09) [from Peter Parker's website]
1-transistor FM Transmitter -  A truly minimalist circuit. Performance is relatively poor and stability is a problem. Q1 modulates  signal and acts as an oscillator. L1 and C5 determine  frequency. Decrease C5 for a higher frequency and vice-versa. You won't get a long range transmission with this one....
24V 12V DC DC Converter -  Find out how you can use a 24V battery (bank) to power 12V devices…. [REUK - Renewable Energy UK website]
2-Step Power Conversion: Portable Power for the Future -  Design Solutions 8  Design Notes (Linear Technology)  (App Note - added 1/06)
3 Phase Voltage Multiplier -  The Cockcroft-Walton turbine voltage multiplier…. [REUK - Renewable Energy UK website]
3.3V converter delivers 3W from Li-ion battery -  11/05/98 EDN-Design Ideas....Lithium-ion batteries are rapidly gaining popularity in portable applications because of their superior energy density, low self-discharge rate, and high cell voltage. When you use one Li-ion battery to power a 3.... [Design Idea by David Salerno, Unitrode Corp, Merrimack, NH]
3.3V Lithium Cell Supply Requires One Inductor -  08/05/99 EDN-Design Ideas....Because of  growing popularity of lithium-ion (Li-ion]batteries and 3.3V power supplies, portable-equipment designers must often create a 3.3V supply that a single Li-ion cell can power.... [Design Idea by Matt Schindler and Jay Scolio, Maxim Integrated Products, Sunnyvale, CA]
3A Point-of-Load Power Supplies-MP1570-DN0004 -  Monolithic Power Systems, Inc Design Note (added 6/06)
3-Phase LTC3733 Provides High Performance Power Solutions for AMD Opteron & Athlon 64 Processors -  DN326  Design Notes (Linear Technology) (App Note - added 1/06)
48kw Resonant Converter for X-Ray Machines Uses High Speed Power Modules With Integral Liquid Cooling -  This paper describes an innovative method for the removal of heat from the four IGBT power modules equipping a 48kW ZVS-mode resonant power converter for CT X-ray machines.  Application Note Microsemi APT9904  ( app note added 4/08)
5 input supply powers 3.3V Portables -  04/13/95 EDN-Design Ideas....The single-ended primary-inductance converter in Fig 1 accepts input voltages ranging from 3 to more than 6V and produces a regulated 3.3V, 200-mA output. The converter accepts an input voltage from three sources  a 5V dc wall cube, a three-cell AA battery, and a lithium backup battery.... [Design Idea by Len Sherman, Maxim Integrated Products, Sunnyvale, CA]
5 Volt Power Supply -  (electronic circuit added 9/03)
5 Volt Supply Derives Power from Three Wire RS232C Port -  10/26/95 EDN-Design Ideas The circuit in Fig 1  produces a semiregulated 5V output from an RS-232C port. Unlike a PC-mouse supply or comparable circuits that rely on the DTR and RTS modem-control signals, this circuit operates with a three-wire port, GND, RX, and TX, and obtains power only from the TX line. Except at high duty cycles, the TX line (RCV-232 on the circuit side) remains.... [Design Idea by John Wettroth, Maxim Integrated Products, Sunnyvale, CA]
5+ to 15- Volts DC Converter -  National Semiconductor Application Note  (App Note - added 2/06)
5-to-1.8V Converter Works Without Magnetics -  To derive 1.8V from 5V, you might think of using a switch-mode regulator. Switchers are highly efficient but require inductors. Linear regulators are simple, but would have only 40% efficiency.  This circuit is more than 70% efficient (Figure 2a), sources as much as 100 mA, and uses no inductor....[Maxim Application Note 673]
5V to 3.3V Circuit Collection -  DN91  Design Notes (Linear Technology) (App Note - added 2/06)
5V to 3.3V Regulator with Fail-Safe Switchover -  DN82  Design Notes (Linear Technology) (App Note - added 2/06)
5V/1A Power Supply -  ….(Circuit design added 03/08)
6 to 12 Volt Converter (Aaron Cake) -  This circuit can provide up to 100%mA of12V power from a 6V supply. The circuit is simple, about 75% efficient and quite useful.....
6 x 6 Loop Antenna -  This new loop antenna is his best design yet and I am proud to be the first to present his work. It uses one, six foot square, six turn loop, and is aperiodic in nature, covering the frequency range 50KHz, 5000KHz.... [Design by Graham Maynard]
600 Volt Power Supply -  simple 600 Volt DC power supply. Convert 230V AC to 300V and 600V DC..(added 6/06)
60-mA current-source feeds telecomm lines -  12/18/97 EDN-Design Ideas An isolated 60-mA current source provides 120V of compliance for use in telecommunication interfaces (Figure 1). Constant-current line feed provides dc power for downstream circuitry independent of line length and provides inherent short-circuit protection. The key to isolated.... [Design Idea by Kurk Mathews, Linear Technology Corp, Milpitas, CA]
60V 3A Step-Down DC/DC Converter has Low Dropout & 100µA Quiescent Current -  DN352  Design Notes (Linear Technology)....[App Note - ]
60V Step-Down DC/DC Converter has Only 100µA Quiescent Current -  DN1007)  Design Notes (Linear Technology)  (App Note - added 1/06)
66000 Modular Power System -  Agilent Application Note....[App Note - ]
8 Switcher Powers High-Performance µPs -  04/13/95 EDN-Design Ideas....The circuit in Fig 1  delivers 8A for driving as many as two of today's high-performance, high-speed µPs. You can also optimize the design for lower current by changing a few components. Most systems use a low-current 12V bias supply and a poorly regulated high-current 5V to power the logic. However,.... [Design Idea by Chester Simpson, National Semiconductor, Santa Clara, CA]
9 Volt 2 Amp Power Supply -  A simple 9 Volt 2 Amp supply using a single IC regulator. (added 6/03)
9-V Stabilized Power Supply -  Circuit only, no description is included…. [Tony van Roon's circuit]
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DC to DC:  #'s     A     B-C     D-F     G-K     L     M-O     P-R     S      T-Z


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