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

Last Updated:  Thursday December 07, 2017 02:04:11 PM

Circuits Designed by Dave Johnson, P.E.

Laptop Power SupplyConcept Only.  I have a big screen HP laptop computer.  The large brick size AC to DC power supply is rated at 19.2v and 9.5 amps, which is about 180 watts.  Id like to be able to use the thing in my car.  I looked into a 12v car adapter for it but never really found one that I liked. . . . Hobby Circuit designed by Dave Johnson P.E.-July, 2009

Light to Frequency ConverterThis circuit uses a CMOS version of the classic 555 timer, to form a light intensity to frequency converter.  A small PIN photo diode is used as the light detector.  The pulses produced are short, so in some applications you may want to stretch them or . . . Hobby Circuit designed by David A. Johnson P.E.-May, 2008

LM317 adjustable voltage regulator used in Battery Eliminator CircuitIf you use a 1.5v or a 3v battery powered MP3 player for long periods of time, you may get tired of constantly changing batteries.  Some older players do not work will NiMH
rechargeable batteries so changing out batteries can get expensive.  The circuit be . . . Hobby Circuit designed by David A. Johnson P.E.-June, 2005


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

L200 Power Supply -  Power supply with variable voltage and fixed current regulation made using the ubiquitous L200C regulator.   __ Designed by Andy Collison

Laptop Power Supply -  Concept Only.  I have a big screen HP laptop computer.  The large brick size AC to DC power supply is rated at 19.2v and 9.5 amps, which is about 180 watts.  Id like to be able to use the thing in my car.  I looked into a 12v car adapter for it but never really found one that I liked. . . . Hobby Circuit designed by Dave Johnson P.E.-July, 2009

Latching Regulator Prevents Deep Discharge -  03/16/95 EDN-Design Ideas To avoid a deep discharge that can shorten or destroy a rechargeable battery's life, you need to remove the load at the point of complete discharge.  Because a battery's terminal voltage recovers after load removal, you can't simply disconnect the load when the voltage dips below a threshold and reconnect it when the voltage returns above that threshold__ Circuit Design by Doug Vargha, Maxim Integrated Products, Sunnyvale, CA

LDO Buck/Boost 2 Sync Buck Sync Boost Reference Design -  LDO, Buck/Boost, 2 Sync.  Buck, Sync.  Boost with Vin 2.7-4.2 V LiION or 4.5-6.5 V adapter.  Multiple output voltages of 1.5 V, 2.5 V, 3.3  V and 8 V.  The total output power is 5.5 W.   __

LDO Provides Smart Power Monitoring -  10/24/96 EDN-Design Ideas Modern low-dropout (LDO) voltage regulators for battery-powered or other micropower applications offer a variety of monitoring and diagnostic functions, such as low-battery and out-of-regulation signals.  Dedicated LED indicators for these diagnostic functions, plus a typical power-on indicator, consume relatively large amounts of power.  This design integrates several power-monitoring/diagnostic functions into one bicolor LED, thus conserving power and extending battery life.  __ Circuit Design by Alexander Belousov, Consultant, Rego Park, NY

Leakage-energy recuperating winding self-supplies a DC-DC converter -  EDN-Design Ideas 07/05/2013    Use a bifilar winding as a snubber to clamp ringing and power the PWM controller IC__ Circuit Design by Todor Arsenov

Light Bulb Voltage Regulator  -  The LVR2 and LVR3 work by Pulse Width Modulating the battery voltage and applying that to the light bulb.  In simplier terms it turns the light on and off so fast that the bulb appears to burn smoothly.  The LVR adjusts the time on versus the time off precisely, so that can the bulb maintains the same brghtness even as the battery voltage drops, until the battery voltage is the same as the bulb voltage.  At that point the LVR is on 100% of the time and the bulb grows dimmer with further battery drop. __ Designed by Willie Hunt

Light to Frequency Converter -  This circuit uses a CMOS version of the classic 555 timer, to form a light intensity to frequency converter.  A small PIN photo diode is used as the light detector.  The pulses produced are short, so in some applications you may want to stretch them or . . . Hobby Circuit designed by David A. Johnson P.E.-May, 2008

Light to Frequency Converter -  Fout = 1.4kHz per microampere of photo diode current, IPD.  The LTC6990 is a precision silicon oscillator with a programmable frequency range of 488Hz to 2MHz.  It can be used as a fixed-frequency or voltage-controlled oscillator (VCO).  The LTC6990 is part of the TimerBlox family of versatile silicon timing devices.  A single___ Linear Technology/Analog Devices App Note, Jun 16th 2010

Line Power Supply -  This circuit provides a regulated output without a power transformer.  It is similar to common circuits, except that a zener diode is replaced with an SCR.    This is far more robust against line voltages surges than a zener diode version, plus there is no h __ Designed by Andrew R. Morris

Linear Regulator Converts 3.3 to 2.9V -  03/16/95 EDN-Design Ideas A linear regulator is often a better choice for developing supply voltages below 3.3 V than a switching regulator.  At low output voltages and moderate currents, the linear regulator is less expensive and requires less pc-board are__ Circuit Design by Matt Schindler, Maxim Integrated Products, Sunnyvale, CA

Linear regulator=low-cost DC/DC converter 03/16/95 EDN-Design Ideas A linear regulator is often a better choice for developing supply voltages below 3.3 V than a switching regulator.  At low output voltages and moderate currents, the linear regulator is less expensive and requires less pc-board are__ Circuit Design by Susanne Nell, Breitenfurt, Austria

LM317 adjustable voltage regulator used in Battery Eliminator Circuit -  If you use a 1.5v or a 3v battery powered MP3 player for long periods of time, you may get tired of constantly changing batteries.  Some older players do not work will NiMH
rechargeable batteries so changing out batteries can get expensive.  The circuit be . . . Hobby Circuit designed by David A. Johnson P.E.-June, 2005

Logic PSU with OverVoltage Protection -  A simple 5 Volt regulated PSU featuring overvoltage protection. __ Designed by Andy Collison

Low Current, High Voltage Power Supply -  A high voltage power supply is a very useful source which can be effectively used in many applications like biasing of gas-discharge tubes and radiation detectors etc.  Such a power supply...___ Electronics Projects for You

Low Dropout 550kHz DC/DC Controller Operates from Inputs as Low as 2V -  DN208 Design Notes___ Linear Technology/Analog Devices

Low Noise Varactor Biasing with Switching Regulator -  AN85 Telecommunication, satellite links and set-top boxes all require tuning a high frequency oscillation.  The actual tuning element, a varactor diode, requires high voltage bias for operation.  The high voltage bias must be free of noise to prevent unwanted oscillator outputs___ Linear Technology/Analog Devices

Low Voltage , High Current Time Delay -  In this circuit a LM339 quad voltage comparator is used to generate a time delay and control a high current output at low voltage.  Approximatey 5 amps of current can be obtained using a couple fresh alkaline D batteries.  Three of the comparators are wired in parallel to drive a medium power PNP transistor (2N2905 or similar) which in turn drives a high current NPN transistor (TIP35 or similar).  The 4th comparator is used to generate a time delay after the normally closed switch is opened __ Designed by Bill Bowden

Low Voltage High Current Time Delay -  In this circuit a LM339 quad voltage comparator is used to generate a time delay and control a high current output at low voltage.  Approximatey 5 amps of current can be obtained using a couple fresh alkaline D batteries.  Three of the comparators are wired in parallel to drive a medium power PNP transistor (2N2905 or similar) which in turn drives a high current NPN transistor (TIP35 or similar).  The 4th comparator is used to generate a time delay after the normally closed switch is opened __ Designed by Bill Bowden

Low Voltage Hot Swap Controller Ignores Backplane Noise & Surges -  DN319 Design Notes___ Linear Technology/Analog Devices

Low-Battery Detector Preregulates Input Voltage -  08/15/96 EDN-Design Ideas The circuit in Figure 1 uses the comparator and voltage reference of a low-battery detector to preregulate the input voltage.  The circuit provIdeas an additional regulated voltage output at VOUT1 and significantly reduces the linear regulator's (VOUT2's) power dissipation.  The two outputs (12V at 50 mA and 5V at 100 mA) are independent.__ Circuit Design by Khy Vijeh, Analog Devices Inc, Santa Clara, CA

Low-cost switcher converts 5 to 24V -  02/16/98 EDN-Design Ideas (File contains several circuits, scroll to find this one)__ Circuit Design by Paul C Florian, Plano, TX

Low-Dropout 12V Regulator LM324 -  Most regulator circuits require at least 3 to 5 volts between input and output to operate reliably.  This regulator features a P-Channel MOS-FET pass element that will allow for a very low drop out voltage.  In my particular application reliable operation was noted down to nearly 0.1volt between input and output at nearly 0.8 amperes of load current.  Useful applications include automotive and battery applications were regulation is desired and available input-output differential __ Designed by Robert A. Jones

Lower DC/DC converter ripple by using optimum capacitor hookup -  31-Oct-02 EDN-Design Ideas Low-ripple-voltage positive-to-negative DC/DC converters find use in many of today's high- frequency and noise-sensitive disk drives, battery-powered devices, portable computers, and automotive applications.  Like a positive buck converter, a positive-to-negative converter can have low output-ripple voltage if you place the bulk input capacitor between VIN and VOUT rather than between VIN and gr__ Circuit Design by Keith Szolusha, Linear Technology Corp, Milpitas, CA

Low-Power Voltage Doubler -  All miniature electronic devices operate off batteries.  Some of them need higher than the standard battery voltages to operate efficiently.  If the battery of that specific voltage is unavailable, we are...___ Electronics Projects for You

LT1074/LT1076 Design Manual -  AN44 Linear Technology This note discusses the use of the LT107) 4 and LT107) 6 high efficiency switching regulators.  These regulators are specifically designed for ease of use.  This App Note is intended to eliminate the most common errors that customers make when using switching regulators___ Linear Technology/Analog Devices

LT1120A-Micropower Regulator with Comparator & Shutdown -  Switching Regulator___ Linear Technology/Analog Devices

LT1339 Design Manual -  AN73 Linear Technology This App Note contains detailed design information to allow the reader to craft switching regulators using the LT1339 high power synchronous DC/DC converter.  The note provides expanded pin descriptions for the LT1339 as well as easy-to-use graphical tools___ Linear Technology/Analog Devices

LT1370: a 500kHz 6a Monolithic Boost Converter -  DN183 Design Notes___ Linear Technology/Analog Devices

LT1534 UltraLow Noise Switching Regulator Controls EMI -  DN178 Design Notes __ Linear Technology/Analog Devices

LT1580 Fast Response Low Dropout Regulator Achieves 0.4 Dropout at 4 Amps -  DN119 Design Notes __ Linear Technology/Analog Devices

LT1777 High Voltage Low Noise Buck Switching Regulator -  DN212 Design Notes___ Linear Technology/Analog Devices

LT3465-1.2MHz White LED Step-Up Converters with Built-In Schottky in ThinSOT -  LT3465 Switching Regulator___ Linear Technology/Analog Devices

LT3465A-2.4MHz White LED Step-Up Converters with Built-In Schottky in ThinSOT -  Switching Regulator___ Linear Technology/Analog Devices

LT3757 Boost, Flyback, SEPIC & Inverting Controller-Video Product Brief -  The LT3757 is a wide input range, current mode, DC/DC controller which is capable of generating either positive or negative output voltages.  It can be configured as either a boost, flyback, SEPIC or inverting controller.  The LT3757 drives a low side external N-channel power MOSFET from an internal regulated 7.2V supply.  The___ Linear Technology/Analog Devices App Note, Kevin B. Scott-Strategic Marketing Engineer Jun 4th 2010

LTC Design Note 509: 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 componentsCircuit Design 

LTC1267 Dual Switching Regulator Controller Operates from High Input Voltages -  DN114 Design Notes___ Linear Technology/Analog Devices

LTC1436-PLL Low Noise Switching Regulator Helps Control EMI -  DN141 Design Notes___ Linear Technology/Analog Devices

LTC1474/LTC1475 High Efficiency Switching Regulators DraW Only 10A Supply Current -  DN162 Design Notes___ Linear Technology/Analog Devices

LTC1645 Dual Channel Hot Swap Controller/Power Sequencer -  DN217 Design Notes___ Linear Technology/Analog Devices

LTC1646: Power Supply Isolation Controller Simplifies Hot Swapping the CompactPCI Bus for 5V-/3.3V-Only Applications -  DN253 Design Notes___ Linear Technology/Analog Devices

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


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