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Converters Voltage
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Last Updated:  Thursday November 30, 2017 07:38:56 AM

Circuits Designed by Dave Johnson, P.E.

Touch Switch 240VA - CThis 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




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

Technique Improves Transient Dynamics -  06/24/99 EDN-Design Ideas Designing low-voltage, high-current converters with fast dynamic performance places stringent demands on a system designer.  However, a simple technique reduces the peak voltage deviation and decreases the response time for a tran__ Circuit Design by Robert Sheehan, Linear Technology Corp, Milpitas, CA

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 downThe 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.

Three-V supply Delivers 12V p-p to piezo speaker 10/16/03  EDN-Design Ideas Low-profile piezoelectric speakers can provide quality sound for portable electronic devices, but they require voltage swings greater than 8V p-p across the speaker element.  Yet, most portable devices include only a low-voltage pow__ Circuit Design by Royce Higashi and Tony Doy, Maxim Integrated Products, Sunnyvale, CA

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 240VA - C -  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

Transformerless Power Supply -  I have received a few emails asking for a transformerless power supply.  Here is such a supply.  This supply uses no heavy step down transformer and has an extremely low parts count.  The circuit can be built very small and can supply small currents for small projects.  The major downfall of this supply is that it is not isolated from the AC line and can only supply small currents __ Designed by Aaron Cake

Transformerless Power Supply -  Power Supply Circuits:  This circuit will supply up to about 20mA at 12 volts.  It uses capacitive reactance instead of resistanceso it doesn't generate very much heat.  The circuit was designed to provide a cheap, compact power supply for CMOS logic circuits that require only a few milliamps.  The logic circuits were then used to control mains equipment, using an optically-isolated TRIAC. __ Designed by Ron J.

Transistor quickly wakes sleeping LDO -  09/01/98 EDN-Design Ideas NOTE :  File has many circuits, scroll down.  Portable systems, such as telephone handsets, make extensive use of low-dropout (LDO) regulators.  These components provide noise-sensitive parts with a stable power-supply line.  When a telephone enters standby mode, most of the circuits go to sleep by disabling the LDO's outputs.  Operating current thus drops to a minimal level.  When a user starts to dial a number, the LDO receives an enable signal and immediately delivers the nominal operating voltage.  Unfortunately, most low-noise LDOs use a bypass capacitor that briefly loads the internal reference voltage upon wake-up.__ Circuit Design by Christophe Basso, Motorola Semiconductor, Toulouse, France

Triggered spark gap -  This is purely a construction article.   __

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 Channel Gate Driver for Large IGBT Modules -  The BG2A is a fully isolated two channel gate drive Circuit designed for use with dual IGBT modules.  The BG2A utilizes Powerex VLA500-01 or VLA502-01 hybrid gate drivers to provide efficient switching of modules rated up to 1400A.  The hybrid gate driver features a built-in high speed opto-coupler, short circuit protection and an isolated DC to DC converter with 2500VRMS isolation.   __

Two ICs Convert 4 20mA Signal to 0 5V Output -  App Note/ 823 / Aug-09___ Maxim Integrated

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

Two watt switching power supply -  In this small switching power supply, a Schmitt trigger oscillator is used to drive a switching transistor that supplies current to a small inductor.  Energy is stored in the inductor while the transistor is on, and released into the load circuit when the transistor switches off.  The output voltage is dependent on the load resistance and is limited by a zener diode that stops the oscillator when the voltage reaches about 14 volts.  Higher or lower voltages can be obtained by adjusting the voltage divider that feeds the zener diode.  The efficiency is about 80% using a high Q inductor.   __ Designed by Bill Bowden

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