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Voltage Regulator Circuits

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

 

Last Updated: 09/14/2017 03:19 PM

Circuits Designed by Dave Johnson, P.E. :

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.  I'd 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 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

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

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

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

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

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:

Mini-Drill Variable Power Supply -  T1 steps down AC voltage from 115VAC (Tony van Roon's or 220VAC) to about 8VAC and is then rectified via bridge rectifier BR1 to about 11.52Vdc.  C1 filters off the AC ripple.  if you find the circuit output too noisy add another electrolytic capacitor over the output terminals.  Value can be between 10 and 100uF/25V.  The output voltage is variable with the 10K-potentiometer while keeping the current constant __ Designed by Tony van Roon  VA3AVR

Minimizing switching-regulator residue in linear-regulator outputs -  12/05/05  EDN Technical Article: Banishing those accursed spikes takes attention to detail and understanding the subtleties.   __ Circuit Design by Jim Williams, EDN's most revered contributor, passed away in June 2011 after a stroke.  He was 63.

Misc. Regulator Circuits -    NOTE: Scroll down - This simple regulator provides excellent performance when the input voltage is several volts above the output voltage. The output voltage is set by the zener and is approximately 0.6 volts above the Zener's rating. __  Contact:  Charles Wenzel of Wenzel Associates, Inc.

Modulating a Reference Allows Maximum-Value Search for Phase Detection -  04/21/11  EDN Design Ideas:  Modulating a reference and target signal lets you find the maximum modulation based on modulation phase. __ Circuit Design by Chien-Hung Chen, Hui-Shun Huang, Jyi-Jinn Chang, and Tai-Shan Liao, National Applied Research Laboratories, Hsinchu, Taiwan

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 LDO Voltage Regulator -  This circuit has excellent voltage regulation, due to positive feedback through R2 however the circuit must be started up.  This is done by Q4 and Q5.  if the circuit does not need to be started under load, Q4, Q5, and R6 can be deleted.  You must then pl __ Designed by Andrew R. Morris

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

Multiple Voltage Power Supply -  Schematic only, no circuit description __ Designed by Andy Wilson

National Semiconductor Dual High-Current Power Supply Kit -  The National Semiconductor Power Supply Kit is designed around the National LM2636, a synchronous buck regulator.  it provides over 28 amps of current with variable output voltages ranging from +1.3V to +3.3 V.  __ 

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 icon 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 LTC1266 Switching Regulator Provides High Efficiency at 10A Loads -  DN103 Design Notes__ Linear Technology/Analog Devices

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

New Synchronous Stepdown Switching Regulators Achieve 95% Efficiency -  DN68 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 printed __ 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 regulators - An 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

Optocoupler Makes a Simple Circuit Low-Dropout Regulator -  01/06/11 EDN Design Ideas:  A zener or two LEDs serve as the reference voltage.  [Design ideas - by Marc Ysebaert, De Pinte, Belgium __ Circuit Design by Marc Ysebaert, De Pinte, Belgium

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

Over / Under-Voltage Protection Of Electrical Appliances -  This circuit protects refrigerators as well as other appliances from over and under-voltage.  Operational amplifier IC LM324 (IC 2) is used here as a comparator.  IC LM324 consists of four operational amplifiers, ...__ Electronics Projects for You

Over/Under Voltage Cut-Out -  This over/under voltage cut-out will save your costly electrical and electronic appliances from the adverse effects of very high and very low mains voltages.  The circuit features auto reset and utilizes easily available components.  it makes use of the comparators available inside 555 timer IC s__ 

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

 


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