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Regulator Circuits
Regulators:  #'s - A       B - G       H - Q       R - S       T  - Z


Last Updated: October 24, 2017 02:55 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 David Johnson P.E.-July, 2006

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


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

The architecture of a low-noise, Low-dropout regulator -  05/11/00  EDN Design Ideas:  Figure A shows a design scheme for a low-noise, low-dropout regulator that the LT176X through LT196X family of regulators uses.  This scheme minimizes noise transmission within the loop and minimizes noise from an unregulated input.  The bypass capacitor, C __ Circuit Design by EDN Staff

ThinSOT Micropower Buck Regulator has Low Output Ripple -  DN373 Design Notes__ Linear Technology/Analog Devices

ThinSOT Switching Regulator Controls Inrush Current -  DN365 Design Notes__ Linear Technology/Analog Devices

Three-Terminal Adjustable Regulators -    NOTE: Scroll down - The unregulated DC supply is a very common type and the simple regulator shown in fig.1 may be added for projects that require a stable voltage. __  Contact:  Charles Wenzel of Wenzel Associates, Inc.

Tiny & Efficient Boost Converter Generates 5V at 3A from 3.3V Bus -  DN280 Design Notes__ Linear Technology/Analog Devices

Tiny Buck Regulator Accepts Inputs from 3.6V to 25V & Eliminates Heat Sink -  DN268 Design Notes__ Linear Technology/Analog Devices

Tiny Highly Flexible Dual Boost/Inverter Tracks Supplies -  DN357 Design Notes__ Linear Technology/Analog Devices

Tiny Regulators Drive White LED Backlights -  Design Notes 231__ Linear Technology/Analog Devices

Tiny Versatile Buck Regulators Operate from 3.6V to 36V Input -  DN367 Design Notes__ Linear Technology/Analog Devices

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 David Johnson P.E.-July, 2006

Twin T power oscillators work as DC-biased AC sources -  9-Apr-09 EDN Design Ideas:  Using a frequency-selective twin-T network and the LT3080 linear regulator, you can achieve a low-distortion twin-T oscillator with power-driving capability __ Circuit Design by Tiger Zhou and Robert Dobkin, Linear Technology, Milpitas, CA

Two AA cells power step-down regulator -  01/07/99 EDN Design Ideas:  (Scroll to find this one) DC/DC conversion is particularly challenging when both the input and output voltages are low.  Step-up ICs  that operate with inputs lower than 1V are available, but step-down ICs  that accept input voltages   Page includes several designs.   __ Circuit Design by Len Sherman, Maxim Integrated Products, Sunnyvale, CA

Two Phases to Cut Current & Improve EMI -  11/12/09 EDN Design Ideas:  in DC/DC-converter applications in which the input voltage may be lower or higher than the output voltage, you can use either a flyback converter or a SEPIC  (single-ended-primary-inductor converter).  SEPIC s offer lower input-curre __ Circuit Design by Goran Perica, Linear Technology App Note, Milpitas, CA

Two transistor regulators -  a theoretical discussion __ Designed by Richard Torrens

UCC3819 250-W PFC Boost follower PreRegulator Design -  This is an App Note that describes a reference design.  This paper reviews the benefits of a boost follower topology and the design of a 250-W PFC boost follower preregulator.  __ 

Ultra Low Drop Linear Regulator -  The circuit is a MOSFET based linear voltage regulator with a voltage drop of as low as 60 mV at 1 ampere.  Drop of a fewer millivolts is possible with better...__ Electronics Projects for You

UltraFast Linear Regulator Eliminates All Bulk Tantalum & Electrolytic Output Capacitors -  DN157 Design Notes __ Linear Technology/Analog Devices

Ultra-Low Dropout Regulator -  DN32 Design Notes__ Linear Technology/Analog Devices

UltraLow Noise Switching Power Supplies Simplify EMI Compliance -  DN316 Design Notes__ Linear Technology/Analog Devices

Ultra-low-noise low-dropout regulator achieves 6-nV/√Hz noise floor -  06/23/05  EDN Design Ideas:  LDO has ultralow-noise output __ Circuit Design by Ken Yang, Maxim Integrated Products Inc, Sunnyvale, CA

Ultrathin dual 2.5A or single 5A μModule regulator fits on the backside of PCBs, allowing space on the topside for digital ICs -  EDN Design Ideas:  09/29/2016    This versatile DC-DC excels where height is limited and multiple ganging options are advantageous __ Circuit Design by LTC Design Note

Understanding and Applying the LT1005 Multifunction Regulator -  Linear Technology AN1 __ Designed by Jim Williams - Aug 1st, 1984

Use a switching-regulator controller to generate fast pulses -  04/13/06  EDN Design Ideas:  Switching-regulator-controller ICs  can deliver gate-drive pulses with rise and fall times of less than 2 nsec, making them ideal candidates for laboratory pulse-generators __ Circuit Design by Mitchell Lee, Linear Technology Corp

Use a Three-Phase Rectifier & Voltage Reducer for Offline Single-Phase Supplies -  EDN-Design ideas -- 04/06/12    Missing diodes create gaps to allow voltage reduction. __ Circuit Design by JB Castro-Miguens, Cesinel, Madrid, Spain; C Castro-Miguens, University of Vigo, Spain; M Pérez Suárez, University of Vigo, Spain; and A Abal Pena, Tekplus, Vigo, Spain

Use an LM317 as 0 to 3V Adjustable Regulator -  10/02/08  EDN Design Ideas:  LM317 acts as an adjustable regulator __ Circuit Design by Vladimir Rentyuk, Modul-98 Ltd, Zaporozhye, Ukraine

Use Two Phases to Cut Current & Improve EMI -  11/12/09 EDN Design Ideas:  in DC/DC-converter applications in which the input voltage may be lower or higher than the output voltage, you can use either a flyback converter or a SEPIC  (single-ended-primary-inductor converter).  SEPIC s offer lower input-curre __ Circuit Design by Goran Perica, Linear Technology, Milpitas, CA

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.  The LM317 requires a couple extra volts on the input side, plus the emitter/base drop of the 3055s, plus whatever is lost across the (0.1ohm) equalizing resistors (1volt at 10 amps) , so a separate transformer and rectifier/filter circuit is used that is a few volts higher than the output voltage __ Designed by Bill Bowden

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 16, 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

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

Vxi Switching Application Note 5968-7234 -  Application Note__ Aligent


Regulators:  #'s - A       B - G       H - Q       R - S       T  - Z

 


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