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Voltage Regulator Circuits

Voltage Regulators:  #'s - A       B - D       E - K       L - Q       P - S      
T - Z


Last Updated: 11/30/2017 07:17 AM

Circuits Designed by Dave Johnson, P.E. :

Servo Pulse to Voltage Converter -  A while back a Discover Circuits visitor needed a way to convert servo pulses from a radio controlled device into a voltage.  The drawing below, illustrates the pulse train of the received signal.  The time between pulses is a fixed 20ms while the pulse widths vary from a low of 1ms to a high of 2ms . . . Hobby Circuit designed by David Johnson P.E.-August, 2005

Simple Circuit Negative Supply Circuit -  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 A. Johnson P.E.-July, 2006

Capacitance Proximity Switch
Draws very low power - Ideal for battery-powered applications
6 Models Available - Call 806-368-7747

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

Simple Circuit VCOM adjustment uses any logic-supply voltage -  09/30/04 EDN Design Ideas:  All TFT [thin-film-transistor] LCD panels require at least one appropriately tuned VCOM signal to provide a reference point for the panel’s backplane.  The exact value of VCOM  varies   Page includes several designs.  Scroll to find this one __ Circuit Design by Peter Khairolomour and Alan Li, Analog Devices, San Jose, CA

Simple Power Supply Fits Into Small Spaces -  11/13/03 EDN Design Ideas:  The demand for negative-voltage power supplies is increasing with the popularity of applications for portable devices.  it can be expensive and relatively complicated to generate a negative supply from a positive input source, especially when the design requires both positive and negative outputs __ Circuit Design by Raymond Zheng, Linear Technology, Milpitas, CA

Simples sort out the highest voltage -  11/09/06  EDN Design Ideas:  Greatest-of-three voltage detector drives indicators and external display __ Circuit Design by Ezio Rizzo, Nova SNC, Genoa, Italy, and Vincenzo Pronzato, Felmi SRL, Genoa, Italy

Single Cell Operation -  AN15 1.5V powered circuits for complex linear functions are detailed.  Designs include a V/F converter, a 10-bit A/D, sample-hold amplifiers, a switching regulator and other circuits.  Also included is a section of component considerations for 1.5V powered linear circuits.  __ Linear Technology/Analog Devices

Single Phase Step-Down DC/DC Controller with Digital Power System Management & Input Current Sense -  The digital power supply market has achieved rapid progress in the recent years.  Easy configuration, accurate telemetry, convenient fault analysis and reliability are the trends for the modern digital power supply, which are all provided by Linear’s new digital power controller, the LTC3883.  The LTC3883 is a single phase __ Linear Technology/Analog Devices App Note, Yi Sun-Applications Engineer Oct 4th 2012

Single-Pulse Voltage Multiplier -  09/18/03  EDN Design Ideas:  it is sometimes necessary for a microcontroller to generate a pulse whose voltage is higher than the power-supply voltage of the microcontroller.  The circuit in Figure 1 allows you to generate 14V pulses from a 5V power supply.  An  __ Circuit Design by Richard Cappels, Mesa, AZ

Six Output DC/DC μModule Regulator from 3V to 72V Input -  The LTM8008 is a 72ViN, μModule SEPIC  converter with six post regulators.  The SEPIC  controller’s fixed frequency, current-mode architecture results in stable operation over a wide range of supply and output voltages and features soft-start and frequency foldback functions to limit inductor current during start-up and output short-circuit.  The LTM8008 also includes six high performance, fixed output LDOs for post-regulation__ Linear Technology/Analog Devices App Note, Dec 22, 2010

Small Variable power Supply -  Features: 1.3-12.2 V, 1 A, over-current protection.  This is a simple but reliable device based one of the oldest integrated voltage regulators of them all - the LM723.   __ Designed by Aaron Cake

Smart ripple canceller offers near-zero dropout -  03/10/14 EDN Design Ideas:  Eliminate linear power supply ripple losslessly!  Ripple cancellars, also known as ripple-eaters, gyrators, or electronic filters, are useful when a supply needs to be clean but the absolute supply voltage is unimportant.  A typical application of these circuits is in class-A power amplifiers.  Compared to a linear regulator, they waste less power since they adapt themselves to the input voltage.   __ Circuit Design by Louis Vlemincq

Soft Start power Supply -  Two soft start power supplies.  The output voltage slowly increases to the desired output.   __ Designed by Miroslav Adzic

Soft-Start Regulator Starts at 0V -  6-Jun-96 EDN Design Ideas:  The circuit in Figure 1b overcomes these disadvantages.  Unlike simpler approaches, this circuit starts up at an output of 0V.  This circuit doesn't add any reactive components to the feedback circuit, which prevents any impact on stability and transient response __ Circuit Design by Gerald Kmetz

Solar Cell Phone Charger -  This little gadget uses a small 3 volt solar cell to charge a 6 volt NIC ad battery pack which, in turn, may be used to charge many models of cell phones and other portable devices with the addition of a suitable low-dropout voltage regulator.  The circuit "scavenges" energy from the solar cell by keeping it loaded near 1.5 volts (maximum energy transfer value) and trickle charges the internal battery pack with current pulses.  The simple circuit isn't the most efficient possible but it manages a respectable 70% at 100 mA from the cell and 30% when the cell is providing only 25 mA which is actually pretty good without going to a lot more trouble or using more exotic components. __  Contact:  Charles Wenzel of Wenzel Associates, Inc.

Solar Panel Regulator -  This handy solar panel regulator measures the voltage across your battery or the charging current and will disconnect the panel to stop overcharging.  it works with 12V or 24V systems and has a 3.5-digit liquid crystal display.__ SiliconChip

Solar Panel Shunt Regulator -  Schematic __ Designed by Manfred Mornhinweg

Solar Powered Converter Extends Battery Life in Low Power 3V Primary Battery Applications -  The LTC3129 is a high efficiency, 200mA buck-boost DC/DC converter with a wide ViN and VOUT range.  it includes an accurate RUN pin threshold to allow predictable regulator turn-on and a maximum power point control (MPPC) capability that ensures maximum power extraction from non-ideal power sources such as photovoltaic panels.  __ Linear Technology/Analog Devices App Note, Feb 15th 2013

Solar Powered Converter with MPPC Charges Storage Capacitor -  The LTC3129 is a high efficiency, 200mA buck-boost DC/DC converter with a wide ViN and VOUT range.  it includes an accurate RUN pin threshold to allow predictable regulator turn-on and a maximum power point control (MPPC) capability that ensures maximum power extraction from non-ideal power sources such as photovoltaic panels.  __ Linear Technology/Analog Devices App Note, Feb 15th 2013

SOT-23 Switching Regulator with Integrated 1A Switch Delivers High Current Outputs in a Small Footprint -  DN232 Design Notes__ Linear Technology/Analog Devices

Speed Regulator for Rotary Tool -  microcontroller-based DC motor speed regulator brings control for delicate work.   __ Designed by Andrew Morris' Gadget Freak-Case #226

Split Supply Generator -  Occasionally a designer needs a dual power supply to power a circuit that is operating with signals near or at ground but the only available supply is a single polarity, usually positive.  Many excellent IC solutions are available but a suitable solution for many projects may be constructed from "junk box" parts.  The simple circuit below will generate about 9 volts and -4 volts from a single 5 volt supply with sufficient current to power a simple op-amp circuit.  The positive voltage drops to about 7 volts when supplying 7 mA and the negative voltage drops to about 3.5 volts when supplying 3.5 mA (1k loads).  Although this isn't exactly a +- 15 volt supply, this is plenty of voltage and current for many op-amp circuits and will allow the output of most op-amps to swing below zero volts and will allow most op-amp inputs to measure voltages below zero volts.  This circuit uses the CD4049 which is a high current version of the CD4069 which will also work with somewhat lower current capability.   __  Contact:  Charles Wenzel of Wenzel Associates, Inc.

Stabilised power unit -  I made the stabilised power unit which used the switching regulator.  AC100 V is used for the input of the power unit.  The output voltage can be changed from 5 V to 30 V.  The output current can pour a maximum of 4 A.  I made this power unit as the power unit of the electronic circuits making for the experiment __ Designed by Seiichi Inoue

Step-Down Switching Regulators -  AN35 Discusses the LT107) 4, an easily applied step-down regulator IC .  Basic concepts and circuits are described along with more sophisticated applications.  Six appended sections cover LT107) 4 circuitry detail, inductor and discrete component selection, current measuring techniques, efficiency considerations and other topics (appnote 2/06) __ Linear Technology/Analog Devices

Stereo-amplifier IC's outputs drive multiple loads -  11/21/05  EDN Design Ideas:  Reference provide as constant bias voltage regardless of supply-voltage variations __ Circuit Design by Jean-Jacques Avenel, Maxim Integrated Products, Lesigny, France

Super Power Supply Voltage & Current Regulated -  With Suitable Output Transistors, This Supply Can handle almost any Voltage or Current.  This the Discontinued MC1466L integrated Circuit, But Now you can make it using Descrete Parts.  Transistors, Caps and Resistors.  Although not Really Difficult, I don't believe this Project is Suitable for the Beginner.   __ Designed by G.L. Chemelec

Supply Delivers Pin-Programmable Multiple References -  1-May-03 EDN Design Ideas:  in the circuit of Figure 1, the REF01, IC 1, is a buried-zener-diode-based, precision 10V reference that features minimal noise and drift over temperature.  The circuit provide as not only the 10V output of the REF01, but also a 5V output that a REF02 reference would deliver.  in addition, the circuit provide as -5V, -10V, and an unbalanced dual reference, the sum of whose voltages is precisely 10V __ Circuit Design by V Manoharan, Kochi, India

Supply Savess From Lax Predecessor -  11/23/94 EDN Design Ideas:  The lab supply in Fig 1 automatically sets its output voltage to zero whenever you switch it on.  Thus, the lab supply can't fry your circuit if the previous user left the voltage turned up too high.  The circuit supplies 1 to 25V dc because it uses an LM317 regulator.  When you turn on the supply, the bridge develops __ Circuit Design by Tian Jin-gin, Taiyuan Semiconductor Factory, Taiyuan, Shanxi, China

Switch Mode DC Supply -  The switching power supply, shown in the schematic, provides 12 volts, at10 amps, maximum, using a discrete transistor regulator with an op-amp functioning as a comparator in the feedback circuit.  The supply was constructed in1984 and is variable frequency, as opposed to the pulse width modulator (PWM) controllers used today __ Designed by Michael Ellis

Switched-Capacitor IC & Reference Form Elegant –48 to +10V Converter -  04/24/03  EDN Design Ideas:  A system designer must almost always face a trade-off in choosing the right part for an application.  The trade-off usually involves performance, price, and function.  An example is the issue of powering circuits from a telecom-voltage source.  Telecom systems almost exclusively use high-potential negative rails, such as -48V __ Circuit Design by Wallace Ly, National Semiconductor, Santa Clara, CA

Switching regulator 2 -  I introduce the switching regulator which used MC34063A of the MOTOROLA, inc.  in this page.  This regulator is housed in the DiP (Dual in line Packge) with 8 pins.  The 1.5-A output current can be gotten without the heatsink in spite of this size.  The input voltage can be used from 3 V to 40 V and can do the function of the Step Up (making the output voltage which is higher than the input voltage) , the Step Down (making the output voltage which is lower than the input voltage) and moreover inverting __ Designed by Seiichi Inoue

Switching regulator charges NiMH
-  12/21/00 EDN Design Ideas:  Many NiMH
(nickel-metal-hydride) fast chargers use linear regulators, such as the LM317, in a current-source configuration with a charge-monitor IC .  This arrangement dissipates much heat and requires considerable heat sinking, ad __ Circuit Design by Jason Hansen and Jim Hill, On Semiconductor, Phoenix, AZ

Switching Regulator Collection -  AN30 Switching regulators are of universal interest.  has made a major effort to address this topic.  A catalog of circuits has been compiled so that a design engineer can swiftly determine which converter type is best.  This catalog serves as a visual index to be browsed through for a specific or general interest.  __ Linear Technology/Analog Devices

Switching Regulator Controls CCFT -  02/16/95 EDN Design Ideas:  You can control the current in a cold-cathode fluorescent tube (CCFT]and, hence, its brightness with a switching-regulator IC  __ Circuit Design by Doug Vargha, Maxim Integrated Products Sunnyvale, CA

Switching regulator drives robot Motor -  05/13/99 EDN Design Ideas:  The circuit in Figure 1 shows an example of how you can use an integrated switching regulator (iSR] to efficiently vary the speed of a permanent-magnet dc motor.  in this application, the rotating head of a robot senses the presence of an oncoming object (perhaps a human].  if the robot senses an object, it slows the rotationPDF contains many circuits, scroll to find this one.    __ Circuit Design by Donald Comiskey, Power Trends Inc, Warrenville, IL

Switching regulator forms constant-current source -  05/30/02 EDN Design Ideas:  Many applications require current sources rather than voltage sources.  When you need a high-current source, using a linear regulator is inadvisable, because of the high power dissipation in the series resistor.  To solve the wasted-power problem, you can use a switch-mode regulator.  The circuit of Figure 1 uses IC 1, an LM2576 adjustable regulator __ Circuit Design by Stefan Strozecki, Institute of Telecommunications, bydgoszcz, Poland

Switching Regulator Generates Both Positive & Negative Supply with a Single Inductor: Design Notes Linear Technology -  DN47 Design Notes__ Linear Technology/Analog Devices

Switching Regulator Output goes BeLow VREF -  03/17/94 EDN Design Ideas:  The feedback arrangement of typical switching regulators doesn't allow the regulated outputs to go lower than the reference voltage.  if you try to lower the output by modifying the feedback network, the compensation components the manufacturer recommends may no longer stabilize the regulator's error amplifier __ Circuit Design by Michael Keagy, Maxim Integrated Products, Sunnyvale, CA

Switching regulator turns into light source -  07/17/97 EDN Design Ideas:  Simple external feedback circuit transforms a switching regulator into a constant-intensity light source __ Circuit Design by Donald V Comiskey Jr, Power Trends Inc, Warrenville , IL

Switching Regulators for Poets -  Linear Technology AN25 __ Designed by Jim Williams - Sep 2nd, 1987

Switching-regulator Design lowers noise to 100 µV -  12/04/97 EDN-Design ideas Expending unconscionable amounts of bypass capacitors, ferrite beads, shields, Mumetal, and aspirin to ameliorate noise-induced effects is no longer the only way to tackle switching-regulator noise.  Using a low-noise IC , you can now design switching converters with only 100 mV of noise.  Size, output-flexibility, and efficiency advantages have made switching regulators common in electronic apparatus.  The emphasis on these attributes has resulted in circuitry requiring minimal board area and with 95% efficiency.  Although these advantages are welcome, they necessitate compromising other parameters.    __ Circuit Design by Design by Jim Williams, Linear Technology Corp

Switching-regulator supply provides low-noise biasing for varactor diodes -  11/09/00  EDN Design Ideas:  Low-voltage systems often need a locally generated high voltage.  Even for an application as noise-sensitive as varactor-diode biasing, a carefully planned switching-regulator-based design and layout can provide the necessary bias voltage.   __ Circuit Design by Jim Williams and J Phillips and G Vaughn, im Williams, EDN's most revered contributor-At 63 years of age, Williams passed away in June 2011 after a stroke.

Synchronized Regulator Produces Coherent Noise -  03/17/94 EDN Design Ideas:  By using a gated-oscillator architecture instead of a clocked-PWM one, gated-oscillator-type switching regulators permit high efficiency over extended ranges of output current.  This architecture eliminates the housekeeping currents associated with the continuous operation of fixed-frequency designs.  Gated-oscillator regulators simply self-clock at whatever frequency is necessary to maintain the output voltage.  Typically, loop-oscillation frequency ranges from a few hertz to the kilohertz region, depending on the load.    __ Circuit Design by Jim Williams, Sean Gold, and Steve Pietkiewicz, Linear Technology, Milpitas, CA

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Got Designs?
Please eMail
if you want me to link to and/or post your original design Thanks.

Voltage Regulators:  #'s - A       B - D       E - K       L - Q       P - S       T - Z

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