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Converters Voltage
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Last Updated:  Thursday November 30, 2017 07:38:56 AM

Circuits Designed by Dave Johnson, P.E.

Generate 0.5v Negative SupplyA while back someone needed a simple way to generate a negative 0.5v supply from a conventional transformer type AC to DC power supply.  The circuit below uses a couple schottky diodes and a filter capacitor to perform the feat . . . Hobby Circuit designed by David A. Johnson P.E.-July, 2011

High DC Current IndicatorA while back, someone requested a simple method to indicate when 20 to 50 amps of DC current was flowing through a wire.  The circuit below works well and is about as simple as you can get.  A sensitive reed relay . . . Hobby Circuit designed by David A. Johnson P.E.-April, 2005




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

Generate 0.5v Negative Supply -  A while back someone needed a simple way to generate a negative 0.5v supply from a conventional transformer type AC to DC power supply.  The circuit below uses a couple schottky diodes and a filter capacitor to perform the feat . . . Hobby Circuit designed by David A. Johnson P.E.-July, 2011

Generating Negative 5 Volts from 9 Volt Battery -  A 555 timer can be used to generate a squarewave to produce a negative voltage relative to the negative battery terminal.  When the timer output at pin 3 goes positive, the series 22 uF capacitor charges through the diode (D1) to about 8 volts.  F __ Designed by Bill Bowden

Get buck-boost performance from a boost regulator -  07/11/02 EDN-Design Ideas The SEPIC(single-ended, primary-inductance-converter] topology is generally a good choice for voltage regulators that must produce an on output voltage that falls in the middle of the input-voltage range, such as a 5V output from a 2.7 to 6V input, __ Circuit Design by Tom Gross, Linear Technology Corp, Milpitas, CA

Get power out of PC parallel port -  An article which includes circuits, shares how to us a parallel port to connect to a very wide selection of devices like software protection dongles, removable disks, modems, network adapters, printer sharing units, parallel port extenders, soundcards, electronic telecard readers and many circuits.   __ Designed by Tomi Engdahl

Heavy-duty power supply regulates either voltage, current, or power -  05/05/75  EDN Technical Article:     By combining switching and series-pass techniques, this high-voltage supply's designer achieved 0.01% regulation at power levels to 100W.  __ Circuit Design by Jim Williams, EDN's most revered contributor, passed away in June 2011 after a stroke.  He was 63.

Hex Inverter Makes Low Cost Switching Regulator -  05/23/96 EDN-Design Ideas Simple and low-cost circuit converts5V to12V__ Circuit Design by Dimitry Goder, Switch Power Inc, San Jose, CA

High DC Current Indicator -  A while back, someone requested a simple method to indicate when 20 to 50 amps of DC current was flowing through a wire.  The circuit below works well and is about as simple as you can get.  A sensitive reed relay . . . Hobby Circuit designed by David A. Johnson P.E.-April, 2005

High Efficiency Linear Regulators -  AN32 Presents circuit techniques permitting high efficiency to be obtained with linear regulation.  Particular attention is given to the problem of maintaining high efficiency with widely varying inputs, outputs and loading.  Appendix sections review component characteristics and measurement methods.  __ Linear Technology/Analog Devices

High Efficiency Step-Down Switching Regulator -  DN73 Design Notes___ Linear Technology/Analog Devices

High Voltage Breakdown Tester -  (Not for beginners!)   The following circuit is used to determine the breakdown voltage of electronic components without causing permanent damage.  The circuit quickly ramps the high voltage up from zero and stops when the leakage current reaches a preset amount up to 100 uA.  When power is applied the two-transistor flasher circuit drives the complimentary-symmetry output stage with a square pulse at about 3 or 4 kHz (set by the 0.02 uF capacitor).  The output stage is connected to the speaker winding of an audio transformer from an old tube radio and the transformer steps the voltage up to about 250 VRMS .   __ Contact: Charles Wenzel of Wenzel Associates, Inc.

High Voltage Buck Regualtors provide High Current Low Profile Power Solutions for FireWire Peripherals -  DN287 Design Notes___ Linear Technology/Analog Devices

High Voltage Generator for Low Current Applications -  Scroll to this one -- Here is a simple circuit for generating over 100 volts from a 12 volt source for powering low current devices and experiments.  The two transistors may be 2N4401 and 2N4403 or similar for lower power applications or higher power devices for heavier loads.  If more power is desired then lower the two 10 ohm emitter resistors to 3.3  ohms.  When driving power transistors, more drive may be achieved by adding two more gates and resistors in parallel with the two output gates shown.  Notice that the two driver gates are simply in parallel with 220 ohm current limit resistors in series with their outputs.   __ Contact: Charles Wenzel of Wenzel Associates, Inc.

High-current supply uses standard three-terminal regulator -  07/22/04 EDN-Design Ideas Voltage-regulator design for high output currents can be a critical and difficult task.  Although voltage regulators with 1A maximum output current are simple to design, thanks to 78xx three-terminal voltage regulators, at output currents higher than 1A output, problems arise.  For high output currents, voltage regulators usually use parallel-connected power transistors__ Circuit Design by I Hakki Cavdar, Karadeniz Technical University, Trabzon, Turkey

High-voltage, low-noise DC/DC converters -  08/07/08  EDN Technical Article: You can make a 1-kV dc/dc converter with only 100 V of noise.  __ Circuit Design by Jim Williams, EDN's most revered contributor, passed away in June 2011 after a stroke.  He was 63.

Hot Swap & Buffer I2C Buses -  DN263 Design Notes___ Linear Technology/Analog Devices

Hot Swap Meets Infiniband Specification -  DN265 Design Notes___ Linear Technology/Analog Devices

Hot Swapping the PCI Bus -  DN155 Design Notes___ Linear Technology/Analog Devices

Hot-Swap Controller Handles Dual Polarity -  12/11/03 EDN-Design Ideas Some applications require a hot-swap controller, a circuit-breaker function, or both for dual-polarity, dc-input power-supply rails.  In some hot-swap cases, the requirement is based only on inrush-current considerations.  Control of__ Circuit Design by Dan Meeks, Texas Instruments, Manchester, NH

Hot-swap structure offers improved redundancy -  01/09/03 EDN-Design Ideas For redundancy purposes, a number of power supplies, using ORing diodes, can work into the same load.  During maintenance, when you can remove any power supply, the minimum possible power perturbation at the load is desirable.  To compensate for the voltage drop across the ORing diodes, you must connect the power-supply feedback lines after the diodes, at the load__ Circuit Design by Samuel Kerem, Corvus Corp, Columbia, MD

How to Design a Simple Circuit Isolated Flyback Converter-LT3573 -  Isolated power supplies are needed in a wide variety of applications.  Galvanic isolation is achieved by isolating two or more circuits using a transformer or optocoupler, and is desirable for many reasons: safety, noise immunity, circuit protection, etc.  Traditionally, isolated power supplies use an optocoupler to transfer___ Linear Technology/Analog Devices App Note, Mike Negrete-Design Engineer-Power Products Mar 15th 2009

HV flyback converter improves efficiency -  11/05/13  EDN-Design Ideas This Design Idea significantly improves conversion efficiency of externally driven flyback converter-based capacitor charging units intended for flash-lamp-pumped, pulsed solid-state laser sources.  In a flash-pumped pulsed solid state laser source, an energy storage capacitor is charged to a high voltage, dependant upon the amount of energy it is intended to deliver to the flash lamp when made to discharge.  __ Circuit Design by anil maini , Varsha Agrawal & Nakul Maini

Hysteretic regulators provide high performance at low-cost -  2-Sep-04 EDN-Design Ideas Hysteretic voltage regulators offer the potential advantages of simplicity, fast response, 100%-duty-cycle operation, high efficiency at light loading, and low cost.  They need no loop-compensation components to add delays; thus, response time to a load change is less than one switching cycle.  What's the catch? You must be able to accept a switching frequency that is not precisely controlled and__ Circuit Design by Wayne Rewinkel, National Semiconductor, Phoenix, AZ

Improve On BIAS for GAAS FETs -  12/06/01  EDN-Design Ideas It's important to properly sequence the bias applied to an RF/microwave GaAs FET or a MMIC (monolithic-microwave-IC] amplifier.  These devices are extremely sensitive to drain and gate voltage levels as well as to the order in which t__ Circuit Design by Tom Roberts, Anritsu Co, Morgan Hill, CA

Improve transient Dynamics -  06/24/99 EDN-Design Ideas Designing low-voltage, high-current converters with fast dynamic performance places stringent demands on a system designer.  However, a simple technique reduces the peak voltage deviation and decreases the response time for a tran__ Circuit Design by Robert Sheehan, Linear Technology Corp, Milpitas, CA

Inductor Selection for Lt 1070 Switching Regulators -  DN8 Design Notes___ Linear Technology/Analog Devices

Inductorless converter provides high efficiency -  02/17/00 EDN-Design Ideas Two common methods exist for generating a regulated dc output voltage that is lower than the input voltage.  The first approach is to use a low-dropout (LDO) regulator.  LDO regulators are small, easy to use, and inexpensive, but a__ Circuit Design by Sam Nork

Input Attenuator for the Digital Audio Millivoltmeter -  If you'd like to be able to use our Digital Audio Millivoltmeter to measure AC voltages up to 140V RMS, this add-on project is the answer.  It's a simple switched input divider which lets you add 40dB, 20dB or 0dB of attenuation ahead of the meter at the touch of a knob.___ SiliconChip

Interfacing 5 Volt CMOS to 12 Volt loads -  The circuit above is designed to be used with the bi-directional lamp sequencer shown above on this same page.  Two additional transistors are used to increase the current from the 74HCT138 decoder to control 12 volt 25 watt lamps.  A 6.8 volt/1 watt zener diode is used in series with the ground connection of all the CMOS ICs (74HC14, CD4516 and 74HC138s) so that the total voltage across the CMOS devices will be about 5.2 volts and the outputs will move from +12 to about +7 when selected.  The 2N2905/PNP transistor stage is connected as an emitter follower which provides a high impedance to the __ Designed by Bill Bowden

Isolated Converters Have Buck Simplicity & Performance -  DN377 Design Notes___ Linear Technology/Analog Devices

Isolated DC/DC Conversion with the LT1425 -  DN158 Design Notes___ Linear Technology/Analog Devices

Isolated Flyback Converter Regulates Without an Optocoupler -  DN260 Design Notes___ Linear Technology/Analog Devices

Isolated Signal Trims DC/DC Converter -  09/01/95 EDN-Design Ideas Adding a single resistor and optoisolator to the standard dc/dc converter trim in Fig 1a results in an isolated trim configuration (Fig 1b).  In Fig 1a, VOUT equals VTRIMxVNOM/2.5V.  In this example, VNOM is 15V, and VTRIM is 0 to 2.5V.  This configuration is acceptable for most applications, except those in which the trim signal must be totally isolated from the converter.  For Fig 1b, many types of analog optoisolators are available, but the VTL2C2 provIdeas the necessary characteristics.  __ Circuit Design by Dennis Eichenberg, Parma Heights, OH

Isolated Supply Powers DVM Module -  02/07/08  EDN-Design Ideas A simple, low-cost, isolated flyback power supply energizes a DVM module__ Circuit Design by Richard Dunipace, Fairchild Semiconductor, Irving, TX

Isolated T1 current loop to voltage power supplies -  Designed to operate on a standard 60 mA current loop circuit (T1 current loop) this power supply provides an isolated and regulated 5 VDC at 140 mA. __ Designed by Steve Hageman

Isolated telecomm converter handles 25W -  09/01/97 EDN-Design Ideas Telecomm applications in the central office require an isolated5V supply derived from 48V, this gives out5V at5A from an input voltage of 36 to 72V__ Circuit Design by Ron Young, Maxim Integrated Products, Sunnyvale, CA

Isolated-20 Watt, OEM DC/DC converter (with Telecom input voltage range) -  12 Watt, Single output, Isolated, Modular power supply designed for flexible OEM manufacturing.  The supply may be built for +2.5 to +15 volt outputs with inputs of 9-18, 18-36 or 36-72 VDC. __ Designed by Steve Hageman

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


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