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Converters Voltage
Power Supplies -- Main Page           Converters -- Main Page

Voltage Converters:  #'s - B      C - K      L - Q      R - Z

Last Updated:  Tuesday October 24, 2017 02:54:41 PM

Circuits Designed by Dave Johnson, P.E.

Miniature Pushbutton On/Off SwitchIn many battery powered devices, you would like to turn the circuit on and off by pressing a small pushbutton switch.  One press turns the device on and second press turns it back off.  The flip/flop circuit below uses a minimum number of parts to perform . . . Hobby Circuit designed by Dave Johnson P.E.-October, 2005

Negative 0.5 Volt SupplyThis simple circuit consists of two LEDs and a photo diode.  It 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.  Note:  This circuit is not particularly efficient . . . Hobby Circuit designed by David Johnson P.E.-July, 2006

Nine-Volt Battery EliminatorIf you use 9v battery powered devices for long periods of time, you may get tired of constantly changing batteries.  The circuit below can be wired into any 9v battery powered device, drawing power from an external AC to DC power adapter.  I designed the circuit. . . Circuit by David A. Johnson P.E.-December, 2009


Links to electronic circuits, electronic schematics, designs for engineers, hobbyists, students & inventors:

 

 

Making Voltage Doublers & Multipliers -  Find out how to construct an AC voltage doubler circuit.  Extend it to a tripler circuit and more.   __ Designed by REUK-Renewable Energy UK website

Measure Small Current in DC Servo Motor -  12/06/01 EDN-Design Ideas The simple Circuit design in Figure 1 lets you measure all components of a current flowing in a dc servo motor.  The rectified output of the circuit uses ground as a reference, so you can measure the output by using a single-ended A/D converter.  The current-sense resistor, R1, has a value of 0.1Ω __ Circuit Design by Shyam Tiwari

Method provides fast, glitch-free isolation of I2C & SMBus signals -  24-Jun-04 EDN-Design Ideas I2C is a popular serial protocol for power controllers, ADCs and DACs, EEPROMs, and other devices.  In certain data-acquisition and power-control situations, you must isolate the I2C master from one orslave devices for noise, grounding, or safety issues.  Also, although 128 peripherals may connect to the bus, at some point, differences in ground potential and excessive bus capacitance__ Circuit Design by Mark Thoren, Linear Technology Corp, Milpitas, CA

Method provides overpower protection for quasiresonant supplies -  28-Oct-04 EDN-Design Ideas The main characteristic of quasiresonant switch-mode power supplies is that they exhibit a varying frequency when the input voltage changes.  For a flyback power supply, the power delivered to the output obeys the following equation  POUT=1/2(LP×IP 2×FSWη], where LP is the primary inductance, IP is the peak primary current, FSW is the switching frequency, and η is the e__ Circuit Design by Nicolas Cyr, On Semiconductor, Toulouse, France

Microcontroller Delivers Voltage-multiplied DC Power -  05/11/06 EDN-Design Ideas Use the microcontroller's comparator and PWM blocks to form a simple inductor-based boost converter__ Circuit Design by Aaron Lager, Masterwork Electronics, Santa Rosa, CA

Microcontroller, JFET form low-cost, two-digit millivoltmeter -  06/22/06 EDN-Design Ideas Software subroutines replace hardware A/D converter__ Circuit Design by Noureddine Benabadji, University of Sciences and Technology, Oran, Algeria

Micropower Isolated Flyback Converter with Input Voltage Range from 6V to 100V -  EDN-Design Ideas 03/30/2014     A tiny, integrated flyback converter requires minimal support components__ Circuit Design by LTC Design Note 509

Micropower Regulator with Comparator & Shutdown -  Switching Regulator___ Linear Technology/Analog Devices

Miniature Pushbutton On/Off Switch -  In many battery powered devices, you would like to turn the circuit on and off by pressing a small pushbutton switch.  One press turns the device on and second press turns it back off.  The flip/flop circuit below uses a minimum number of parts to perform . . . Hobby Circuit designed by Dave Johnson P.E.-October, 2005

Monolithic Step-Down Regulator Withstands the Rigors of Automotive Environments & Consumes Only 100µA of Quiescent Current -  DN378 Design Notes __ Linear Technology/Analog Devices

Monolithic Switching Regulator with 100µV Output Noise -  AN70 Linear Technology This publication details circuitry and applications considerations for the LT1533 low noise switching regulator.  Eleven DC/DC converter circuits are presented, some offering <100µV output noise in a 100MHz bandwidth.  Tutorial sections detail low noise DC/DC design, measurement, probing and layout techniques, and magnetics selection.  __ Linear Technology/Analog Devices

Monolithic Synchronous Regulator Drives 4A Loads with FeW External Components -  DN328 Design Notes___ Linear Technology/Analog Devices

Monolithic Synchronous Step-Down Regulators Pack 600mA Current Rating in a ThinSOT Package -  DN300 Design Notes___ Linear Technology/Analog Devices

MOSFET shunt regulator substitutes for series regulator -  25-Nov-04 EDN-Design Ideas You would normally use a series linear regulator or a DC/DC converter to obtain 3V dc from a higher supply.  However, when breadboarding a concept, you may be able to use a shunt regulator, especially if a series regulator of the correct voltage is unavailable.  The MOSFET in Figure 1 can replace a zener diode in a shunt regulator and provide lower output impedance than a zener diode__ Circuit Design by Stuart R Michaels, SRM Consulting

MOSFET switch provides efficient AC/DC conversion -  02/17/00 EDN-Design Ideas Occasionally, you have access to a transformer for powering a dc circuit, but its output voltage is much higher than that required for the dc voltage.  The full-wave-rectified and filtered output of an ac input voltage V X , is V DC =1.414V X-2V F , where V F is the forward drop in the rectifier (approximately 0.7V).   __ Circuit Design by Spehro Pephany, Trexon Inc, Toronto, ON, Canada

MOSFET UPS Regulator's Output Current -  02/01/96 EDN-Design Ideas Use a current mirror and a power MOSFET to increase the output-current capability of an IC-voltage regulator.   __ Circuit Design by Robert Buono, Universal Sonics Mahwah, NJ

Motor Accu Ladder -  Article is in Dutch __ Designed by Jan Hammer

Negative 0.5 Volt Supply -  This simple circuit consists of two LEDs and a photo diode.  It 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.  Note:  This circuit is not particularly efficient . . . Hobby Circuit designed by David Johnson P.E.-July, 2006

Negative Regulator Has &0.4V Dropout Voltage -  11/07/96  EDN-Design Ideas Figure 1 shows a negative low-dropout (LDO) regulator capable of providing output voltages from –2 to –16V, with load currents greater than –3A.  LDO regulators, which can maintain output regulation with less than 1V of I/O span, are popular because of the__ Circuit Design by Chester Simpson, National Semiconductor, Santa Clara, CA

Negative Supply from single positive Supply -  Opamps are very useful.  But one of their major drawbacks is the requirement of a dual supply.  This seriously limits their applications in fields where a dual supply is not affordable or not practicable.  This circuit solves the problem to a certain extent.  It provides a negative voltage from a single positive supply.  This negative voltage together with the positive supply __

Negative Voltage -  A negative supply can be produced by a "Charge-Pump" circuit created with a 555, diodes and capacitors as shown in the following circuit.  The output will deliver about 50mA.  __ 555-Timer

Negative Voltage Generator -  takes in +12V and outputs around -11V __ Designed by pharkus @ hotmail.com

Negative Voltage Load Switch -  The good thing about this design is that i can make use of the system i/o voltage to control the on/off and this is the whole idea.  However, there are many many type of load switches that turn of negative voltages.   __ Designed by Nicholas Choong

Network linearizes DC/DC converter's current-limit characteristics -  10/13/05 EDN-Design Ideas Thermistor adds to efficiency, eliminates sense resistor__ Circuit Design by John Guy and Lance Yang, Maxim Integrated Products Inc, Sunnyvale, CA

New High Efficiency Monolithic Synchronous Step-Down Regulator works with Single or Dual Li-ION Batteries -  DN201 Design Notes___ Linear Technology/Analog Devices

New Micropower Low Dropout Regulators Ease Battery Supply Designs -  DN121 Design Notes___ Linear Technology/Analog Devices

New Voltage References Are Smaller & More Precise -  DN145 Design Notes___ Linear Technology/Analog Devices

NiMH
Battery Charger Reference Design
-  This manual describes a reference design for a NiMH
battery charger that uses the Motorola MC68H (R) C908JK3E MCU.  The MC68H (R) C908JK3E includes a 10-channel Analog-to-Digital Converter (ADC) and a 2-channel Timer Module which can be programmed __ Designed by Freescale

Nine-Volt Battery Eliminator -  If you use 9v battery powered devices for long periods of time, you may get tired of constantly changing batteries.  The circuit below can be wired into any 9v battery powered device, drawing power from an external AC to DC power adapter.  I designed the circuit. . . Circuit by David A. Johnson P.E.-December, 2009

Nine-Volt Stabilized Power Supply -  Schematic only __ Designed by Tony van Roon  VA3AVR

No Design Switching Regulator 5V 5A Buck Step Down Regulator -  DN48 Design Notes___ Linear Technology/Analog Devices

No Design Switiching Regulator 5V Buck/Boost Positive to Negative Regulator -  DN49 Design Notes___ Linear Technology/Analog Devices

Obtain Higher Voltage From a Buck Regulator -  29-May-03 EDN-Design Ideas Several semiconductor vendors'current-mode buck controllers have input-voltage ranges of 30 to 36V but have output-voltage ranges from the reference voltage to approximately 6V.  This output-voltage constraint arises from the common-mode-voltage limitation of the current-sense amplifier.  In real-world applications, the power-supply designer must be able to generate high output voltage for printe__ Circuit Design by Ajmal Godil, Micrel Semiconductor, San Diego, CA

Op Amp makes precise 9V-battery splitter -  07/17/97 EDN-Design Ideas Alkaline 9V batteries are ideal for many portable, handheld applications, this circuit generates a bipolar supply of5V and ­2.3 to ­4V using a precision5V reference and one op amp as a supply splitter__ Circuit Design by Steve Hageman, Hewlett-Packard, Santa Rosa, CA

Optimize output-voltage accuracy of adjustable low-dropout regulator -  EDN-Design Ideas --09/01/98    Optimize output-voltage accuracy of adjustable low-dropout regulatorsAn adjustable LDO is a good choice when you need a nonstandard voltage, but getting the highest accuracy from one requires a few circuit tricks.  --Low-dropout regulators (LDOs) have become common in portable electronic equipment.  Their small size, high noise rejection, and low cost make them an attractive solution to a range of system problems—from active power-supply decoupling to local voltage regulation and control.  Although LDO suppliers offer several fixed output-voltage settings, some applications require settings that you can't get in an off-the-shelf produ__ Circuit Design by Paul Paglia, Telcom Semiconductor

Output Adjustable Flyback Converter -  A high voltage step-up DC power supply using adjustable flyback conversion.   __ Designed by Simon Oh

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Voltage Converters:  #'s - B      C - K      L - Q      R - Z

 


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