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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. :

Touch Switch 240VAC -  This is another capacitance based touch on/touch off switch, which can control power to a 200 watt 240vac load . . . Hobby Circuit designed by Dave Johnson P.E.-February, 2002

Ultra Low Power Human Finger Detector -  The circuit below seems to work well and averages a current drain of only 10 microamps from a lithium cell.  it uses a single CA4013 dual D flip/flop.  One section is wired as a pulse generator.  it applies 10us 10ma pulses to a LED inside a slotted optical sensor at a rate of about 50Hz.  The phototransistor in the second half of the sensor detects the pulses and sends a pulse to the data input of the second flip/flop in the 4013 package.  if there is nothing between the LED and the phototransistor, the inverting output of the 4013 remains low.Circuit Solution by David A. Johnson P.E.-May, 2006

Variable Isolated AC Voltage Spans 0VAC to 280Vac -  I designed and built this circuit about 25 years ago.  it came in handy for many projects that were powered from 120 VAC, 240 VAC and 277 VAC.  it provides complete isolation from the power line.  it uses two 1:1 isolation transformers that are wired in parallel. . . Circuit by David A. Johnson P.E.-July, 2000

Voltage Boost -  in this design a marginal AC to DC linear power supply provides a voltage boost, so it can maintain regulation at low line voltages.  The added components are wired at the AC input and the + DC output of an existing bridge rectifier circuit.  The components act as a full wave “charge pump” which will boost the DC output voltage across the main filter capacitor C3.  Without the boost circuit, when the AC line voltage drops to 105vac, the DC output voltage only reaches 11.5 volts, too low for a 12v voltage regulator. . . . Hobby Circuit designed by Dave Johnson P.E.-July, 2006

Voltage Boost to Series Regulator provided by Capacitor -  This circuit adds some capacitors and diodes to a traditional transformer type series regulator circuit to extend the normal operating range.  it can insure regulation during low line voltage conditions or it can squeeze a few more watts out of a plug-in-the-wall power adapter power supply . . . Hobby Circuit designed by David Johnson P.E.-January, 1998

Voltage Converters-0.5 to 6 Volts -  Conventional silicon transistors just can't operate at voltages less than about 0.7v.  Old germanium transistors could be used, but those are hard to find these days and most are rather large in size.  Some new n-channel MOSFET devices with very. . . Circuit by Dave Johnson P.E.-May, 2007 

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:

Variable Voltage & Current Power Supply -  Another method of using OpAmps to regulate a power supply is shown below.  The power transformer requires an additional winding to supply the op-amps with a bipolar voltage (+/- 8 volts) , and the negative voltage is also used to generate a reference voltage below ground so that the output voltage can be adjusted all the way down to 0.  Current limiting is __ Designed by Bill Bowden

Variable Voltage Regulator -  The LM317T is a adjustable 3 terminal positive voltage regulator capable of supplying in excess of 1.5 amps over an output range of 1.25 to 37 volts.  The device also has built in current limiting and thermal shutdown which makes it essentially blow-out proof.  , __ 

Variable Voltage Source -  The high current regulator below uses an additional winding or a separate transformer to supply power for the LM317 regulator so that the pass transistors can operate closer to saturation and improve efficiency.  For good efficiency the voltage at the collectors of the two parallel 2N3055 pass transistors should be close to the output voltage.  __ Designed by Bill Bowden

Varying Brightness AC Lamp -  in this circuit, an SCR is used to slowly vary the intensity of a 120 volt light bulb by controlling the time that the AC line voltage is applied to the lamp during each half cycle.  The circuit is directly connected to the AC power line and should be placed inside an enclosure that will prevent direct contact with any of the components.  To avoid electrical shock, do not touch any part of the circuit while it is connected to the AC power line.  A 2K, 10 watt power resistor is used to drop the line voltage down to 9 volts DC.  This resistor will dissipate __ Designed by Bill Bowden

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

Versatile Micropower Voltage Reference Provides Resistor Programmable Output from 0.4V to 18V -  DN351 Design Notes__ Linear Technology/Analog Devices

VFD (Vacuum Fluorescent Display) Flyback Power Supply -  The LT3758 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, [Linear Technology, SepIC  or inverting converter.  The LT3758 drives a low side external N-channel power MOSFET from an internal regulated 7.2V supply.  The__ Linear Technology/Analog Devices App Note, Jan 16th 2012

Video Design Idea: Buck regulator controls white LED with optical feedback -  10/25/07  EDN-Video Design ideas - By using optical feedback, you can stabilize the output level of a high-intensity LED __ Circuit Design by Dhananjay V Gadre, Netaji Subhas Institute of Technology, New Delhi, India

Video Design Idea: Build your own laboratory precision voltage reference -  05/24/07 Video Design ideas-EDN    Mark Thoren, mixed-signal application engineering manager with Linear Technology, demonstrates an amplifier-based Circuit design for a relatively inexpensive precision voltage source.    __ Circuit Design by Mark Thoren, mixed-signal application engineering manager with Linear Technology

Voltage Boost -  in this design a marginal AC to DC linear power supply provides a voltage boost, so it can maintain regulation at low line voltages.  The added components are wired at the AC input and the + DC output of an existing bridge rectifier circuit.  The components act as a full wave “charge pump” which will boost the DC output voltage across the main filter capacitor C3.  Without the boost circuit, when the AC line voltage drops to 105vac, the DC output voltage only reaches 11.5 volts, too low for a 12v voltage regulator. . . . Hobby Circuit designed by Dave Johnson P.E.-July, 2006

Voltage Boost to Series Regulator provided by Capacitor -  This circuit adds some capacitors and diodes to a traditional transformer type series regulator circuit to extend the normal operating range.  it can insure regulation during low line voltage conditions or it can squeeze a few more watts out of a plug-in-the-wall power adapter power supply . . . Hobby Circuit designed by David Johnson P.E.-January, 1998

Voltage Converter -  Similar to the system used in modern aviation where an antenna array modulates the phase of an incoming signal.  The commercial system is known as Commutated Aerial Direction Finding (CADF) where a ring of 18 identical antennas are each switched on in sequence, just like winding a rotary switch round and round so that one antenna is always connected to the receiver.   __ Designed by Harry Lythall-SM0VPO

Voltage Converters-0.5 to 6 Volts -  Conventional silicon transistors just can't operate at voltages less than about 0.7v.  Old germanium transistors could be used, but those are hard to find these days and most are rather large in size.  Some new n-channel MOSFET devices with very. . . Circuit by Dave Johnson P.E.-May, 2007

Voltage Difference Magnifier -    NOTE: Must register on this site __ Designed by Published in Elecktor July/Aug, 2010

Voltage doubler -  this circuit rougly doubles the voltage of the input, however the current output is low.  doubled output is at 'V source.  '  __ Designed by Andy Wilson

Voltage doubler improves accuracy -  5-Feb-09 EDN Design Ideas:  A transistor's low saturation voltage results in less loss __ Circuit Design by S Chekcheyev, Tiraspol, Moldova

Voltage Doubler uses Inherent Features of Push-Pull DC/DC Converter -  08/16/07 EDN Design Ideas:  Paralleled Darlingtons drive a wide-range voltage doubler __ Circuit Design by Ajoy Raman, Aeronautical Development Establishment, Bangalore, India

Voltage Inverter using 555 Timer -  Simple and inexpensive circuit can produce a dual (positive and negative) voltage from a single supply input, extremely useful for powering OpAmp and other circuits that require a dual voltage from a single battery.   __ Designed by Aaron Cake

Voltage Level Translator-23001.0  -  Circuit ideas for Designers App Note__ Advanced Linear Devices, Inc

Voltage Limiter Generates Supplies that Improve Standard Diode Technique -  Some systems require a voltage limiter to protect the input circuit.  Designers can connect diodes to V CC and Gnd to create a simple solution (Fig.1).  This simplicity, however, comes at a __ Designed by Yossi Barkan

Voltage Reference Collection -  AN42 A wide variety of voltage reference circuits are detailed in this extensive guidebook of circuits.  The detailed schematics cover simple and precision approaches at a variety of power levels.  included are 2 and 3 terminal devices in series and shunt modes for positive and negative polarities__ Linear Technology/Analog Devices

Voltage reference improves JFET -  26-Oct-00 EDN Design Ideas:  The common JFET current-source in Figure 1a has average output impedance and depends heavily on the JFET's VP and iDSS variations.  These manufacturing variations limit the initial accuracy of the current setpoint that the circuit can obtain with a fixed R1.  Most users of JFET current-sources sample VPPDF has several circuits, scroll to find this one __ Circuit Design by Clayton Grantham, National Semiconductor, Tucson, AZ

Voltage reference is software-programmable -  08/18/05 EDN Design Ideas:  Obtain extra reference voltages from existing ones __ Circuit Design by Reza Moghimi, Analog Devices, San Jose, CA

Voltage reference sets current limit -  11/19/98 EDN Design Ideas:  NOTE:  File contain several designs.  Scroll to find this one.  Power op amps have a real need for active output-current limiting.  Most power-amplifier designs rely on the voltage drop across a user-supplied sense resistor to turn on an internal transistor.  This method has several drawbacks, notably, an inability to change the current-limit point under program control.  The current-limit circuit in Figure 1 allows you to establish the setpoint by applying a voltage to one of the amplifier's pins. __ Circuit Design by Joe Engle, Burr-Brown Corp, Tucson, AZ

Voltage Reference Stabilizes Current Sink -  18-Feb-10 EDN Design Ideas:  Produce a stable current for long-term component testing - Analog circuits for long-term testing of passive components, such as 0.1%-tolerant resistors or high-intensity white LEDs, often require a constant current.  Using two op amps and a voltage reference, you can develop a circuit that provide as a constant-current sink with a variable setting of 0 mA to 0.99A.  The circuit in Figure 1 sinks a stable current through the load.  The load current is insensitive to power-supply-voltage variations.    __ Circuit Design by Suded Emmanuel, Emmanuel’s Controls, Auckland, New Zealand

Voltage Regulator -  A collection of simple but useful circuits made with silicon diodes.  Scroll to find the voltage multiplier circuit.   __ Designed by Jose Pino

Voltage Regulator controls scanner Lamp brightness -  05/13/99 EDN Design Ideas:  An image-scanning device performs best when the scanner IC controls the brightness of the image reflected into the light sensors.  The best way to control brightness is by adjusting the intensity, or light output, of the fluoresce __ Circuit Design by Chester Simpson, National Semiconductor, Santa Clara, CA

Voltage regulator for synchronous generator -  Also called an AVR. __ Designed by Manfred Mornhinweg

Voltage Regulator goes Digital -  11/24/99 EDN Design Ideas:  Power consumption and failing batteries are key issues in battery-operated applications.  Features in the new generation of series voltage regulators address these concerns.  For example, National Semiconductor's LP2951 micropower voltage regulator provide as a logic-level output signal indicating a low regulated __ Circuit Design by Chuck Wojslaw, Xicor Inc, Milpitas, CA

Voltage Regulator w/ Series-Pass Transistor -  What is the function of a voltage regulator circuit? it’s basically this, maintain a precise voltage regardless of the current drawn by the load.  Three basic components are needed to achieve good voltage regulation (spice design) __ 

Vxi Switching Application Note 5968-7234 -  Application Note__ Aligent

Water Level Reference Design -  The Water Level Reference design continuously monitors water level and water flow using the temperature compensated MPXM2010GS pressure sensor in the low cost MPAK package, a dual op–amp, and the MC68HC908QT4, 8–pin microcontroller.  This system uses very few components, reducing the overall system cost.   __ Designed by Freescale

Wide Input Range High Efficiency DDR Termination Power Supply Achieves Fast Transient Response -  DN281 Design Notes__ Linear Technology/Analog Devices

Wide-range regulator Delivers 12V, 3A output from 16 to 100V source -  06/23/05  EDN Design Ideas:  Buck regulator tackles high input voltages __ Circuit Design by Wayne Rewinkel, National Semiconductor, Schaumburg, IL

Wide-range voltage regulator automatically selects operating-mode -  06/09/05  EDN Design Ideas:  Regulator seamlessly adapts to wide output range __ Circuit Design by Joel Setton, Crolles, France

Zener Diode Voltage Regulator -  Make a simple zener diode voltage regulator, .   __ Designed by REUK-Renewable Energy UK website

      <<<        Last Page of T - V

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

 


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