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Last Updated:  Monday December 25, 2017 01:47:42 PM

Circuits Designed by Dave Johnson, P.E.

AC to DC (240v to 5v)Power SupplyThis is simple way to power some 5v logic from a 240vac source.  If a 120vac power adapter is used, the circuit will also work for 120vac power lines . . . Hobby Circuit designed by David A. Johnson P.E.-February, 2002

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

A 13.8V 20A PS - U -  This is a Regulated DC power supply with short circuit protection and with current limiter.   __ Designed by Andy Collison

A 500kHz 6a Monolithic Boost Converter LT1370 -  DN183 Design Notes___ Linear Technology/Analog Devices

A doozy requiring some parts you can't get at the 'Shack. -  You can make a doozy of a xenon strobe using the 12 volt DC in, DC output mercury lamp ballast here at http://www.  donklipstein.  com/ebdc12.  html.  You may run into a problem with the flashtube arcing continuously after a flash.  If you use an open-collector comparator such as a 339 in the overvoltage sensing section of this circuit, you can wired-AND the comparator output with some sort of scheme to disable the circuit for a few to a few tens of milliseconds after a flash   (by "pulling down" Pin 5 of the 555).   __ Designed by Don Klipstein

A Gentle Guide for the Trepidatious -  Linear Technology AN25 __ Designed by Jim WilliamsSep 2nd, 1987

A mad idea for a blacklight strobe -  CAUTIONMay be both hard on your eyes and a bit disappointing __ Designed by Don Klipstein

A Monolithic Switching Regulator with 100µV Output Noise -  Linear Technology AN70 __ Designed by Jim WilliamsOct 1st, 1997

A New High Efficiency Monolithic Synchronous Step-Down Regulator works with Single or Dual Li-ION Batteries -  DN201 Design Notes___ Linear Technology/Analog Devices

A repetitive trigger -  Based on the 555 timer IC, useful for strobe lights.  A bit on the 4017 counter IC for multiple flashes and sequences of flashes __ Designed by Don Klipstein

A Simple Circuit High Efficiency Step-Down Switching Regulator -  DN73 Design Notes___ Linear Technology/Analog Devices

A Simple Circuit Ultra-Low Dropout Regulator -  DN32 Design Notes___ Linear Technology/Analog Devices

A 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.

A Variable Power Supply for the FM Transmitters -  This is a fairly simple, yet very versatile workbench power supply.  With a current limit of 1.5 amperes and a variable voltage from 2.7 volts to 16.5 volts on the output of the LM317T, this unit will come in very handy for your diversified electronic projects   (which usually include different DC voltages.  I have used it mainly for supplying my FM transmitters with different voltages, to see the different effects it has on the units.  In fact, I use it for all my FM transmitters.  It has served me well.  and is still serving proudly! __ Designed by braincambre500 @ yahoo.com

AC to DC (240v to 5v)Power Supply -  This is simple way to power some 5v logic from a 240vac source.  If a 120vac power adapter is used, the circuit will also work for 120vac power lines . . . Hobby Circuit designed by David A. Johnson P.E.-February, 2002

Achieving Microamp Quiescent Current in Switching Regulators -  DN11 Design Notes __ Linear Technology/Analog Devices

Active Shortwave Loop Antenna Loopifier? -  If you have a shortwave or high-frequency receiver or scanner that is struggling to capture signals with a short, whip antenna, and you'd like the kind of performance that a 60-foot 'longwire' antenna can provide but lack the space to put one up, consider __ Contact: Charles Wenzel of Wenzel Associates, Inc.

Active-Preloading Provides Sinking Capability -  01/02/97 EDN-Design Ideas A simple add-on circuit enables a unipolar power supply, usually a current-sourcing circuit only, to sink current from a load.   __ Circuit Design by Michael Shrivathson, National Semiconductor Corp, Santa Clara, CA

ADC's Reference Improves RTD Measurements -  10/27/94 EDN-Design Ideas Temperature measurements using RTDs   (resistance-temperature detectors]generally employ bridge circuits with stable power supplies for signal conditioning.  Unfortunately, this scheme generally produces nonlinear outputs.  A linear b__ Circuit Design by Bharat Heavy Electricals Ltd, Tiruchirapalli, India

Add a signal-strength display to an FM receiver IC -  09/05/02  EDN-Design Ideas The Philips   (www.  semiconductors.  philips.  co) TDA7000 integrates a monaural FM-radio receiver from the antenna connection to the audio output.  External components include one tunable LC circuit for the local oscillator, a few capacito__ Circuit Design by José Miguel-López, RF Center Ltd, Barcelona, Spain

Add an auxiliary voltage to a buck regulator -  31-Oct-02 EDN-Design Ideas You often needthan one regulated output voltage in a system.  A frequently used and reasonably simple way to create this auxiliary output voltage is to add a second winding to the output inductor, creating a coupled inductor or a transformer, followed by a diode to rectify  (peak-detect] this output voltage__ Circuit Design by John Betten, Texas Instruments, Dallas, TX

Add foldback-current protection -  07/21/05  EDN-Design Ideas Enhance three-terminal regulator with foldback oversight__ Circuit Design by Rafael García-Gil and JM Espí, Electronic Engineering Department, University of Valencia, Spain

Add gain to an absolute-value Amplifier -  08/22/02 EDN-Design Ideas The absolute-value amplifier is a basic building block in test-and-measurement and signal-processing applications.  The addition of a DPP  (digitally programmable potentiometer] adds another dimension, G  (gain], to this key circuit.  Because the gain is programmable, you can use the circuit as an absolute-value amplifier  (G&1] or an absolute-value attenuator  (G>1]__ Circuit Design by Chuck Wojslaw, Catalyst Semiconductor, Sunnyvale, CA

Add sequencing & shutdown control to regulator -  10/30/03  EDN-Design Ideas Modern microprocessor- or FP-GA-based circuits require separate and independent power-supply voltages for the core and the I/O circuits.  Some devices require stringent control of the turn-on characteristics and sequencing of these __ Circuit Design by Said Jackson, Equator Technologies Inc, Campbell, CA

Add speech encoding/decoding to your Design -  02/04/99 EDN-Design Ideas -   (Scroll to find this one)  Adding speech capabilities to a design can sometimes lead to complex algorithms and expensive DSPs or specialized audio chips.  However, with  completion of a simplified adaptive differential pulse-code-modulation  (ADPCM]algorithm, you can now implement se audio capabilities in low-cost 8-bit µCs, which typically.   Page includes several designs.  __ Circuit Design by Rodger Richey, Microchip Technology Inc, Chandler, AZ

Add trimmable current limit to DC/DC supply -  08/01/97 EDN-Design Ideas You can add a simple, two-transistor circuit to a standard, step-down DC/DC converter to provide an adjustable limit for the output current.  You can apply this method to most step-down converters that provide access to the feedback node__ Circuit Design by Terry Millward, Maxim Integrated Products UK Ltd, Theale, UK

Added components improve switching-regulator stability -  09/29/05 EDN-Design Ideas Extra components reduce effects of external load capacitance and ESR__ Circuit Design by Wayne Rewinkel, National Semiconductor, Schaumburg, IL

Adjustable DC-DC Converter for Cars -  Run your laptop in your car.  Charge SLA batteries and run 24V equipment from a 12V battery.___ SiliconChip

Alarm PS - U -  A 12 Volt power suppiled designed for Ron's Modular Burglar Alarm.  However, being a popular supply voltage this circuit will have many other uses as well.   __ Designed by Ron J.

AM Modulator has high bandwidth -  09/11/98 EDN-Design Ideas -   (File has many circuits, scoll to find this one)  The simple circuit in Figure 1  is an add-on modulator that converts the output of a continuous-wave  (CW] source to either an amplitude-modulation  (AM] or a suppressed-carrier-modulation  (SCM] format.  Because the circuit has unity gain and 50 Ohm input and output impedances, the CW generator's__ Circuit Design by MJ Salvati, Flushing Communications, Flushing, NY

An Alarm Power Supply with Battery Back-up -  Power Supply Circuits:  This Power Supply is suitable for the Modular Burglar Alarm.  However, it has other applications.  It is designed to provide an output of 12-volts, with a current of up to 1-amp.  In the event of mains failure, the back-up battery takes over automatically.  When the mains is restored, the battery recharges.  __ Designed by Ron J.

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

AN25Switching Regulators for Poets: A Gentle Guide for the Trepidatious -  Linear Technology AN25 __ Designed by Jim WilliamsSep 2nd, 1987

AN70A Monolithic Switching Regulator with 100µV Output Noise -  Linear Technology AN70 __ Designed by Jim WilliamsOct 1st, 1997

Auto-Adjustable Regulators Power Pentium Pr -  12/07/95  EDN-Design Ideas Powering Intel’s next-generation Pentium Pro   (P6) µ proves to be a nontrivial task due to both the greater-than-30W load and the need to finely adjust input voltage level on a chip-by-chip basis.  The AA32A family of switching regulators from Astec America__ Circuit Design by Maury WrightAstec America Inc, Carlsbad, CA -- 12/07/95

Automatic Local Sensing Improves Regulation -  1/04/96 EDN-Design Ideas A power supply usually needs to provide a regulated voltage across a load, but there is always some voltage drop across the conductors that carry the current to the load.  Two common techniques help the supply to achieve the proper voltage across the load.  One__ Circuit Design by Jimmie D Felps, Hewlett-Packard Colorado Springs, CO

Automatic Trickle Charger -  Scroll down to find this circuit.  Here is the schematic for the automatic charger I have been using for my kids' battery cars.  The charger is a small molded unit that probably doesn't supply more than an amp and this circuit would have trouble with much more.  No current limit is provided by this circuit __ Contact: Charles Wenzel of Wenzel Associates, Inc.

Autoranging simplifies hardware & software -  07/22/99 EDN-Design Ideas -   A natural approach to autoranging is to use an inverting op amp and switch in one of N feedback resistors at a time for a gain of A=-RF/RO (Figure 1).  However, the inverting configuration suffers from low input impedance of ZIN=RO because the negative input is at virtual ground.__ Circuit Design by Dana Romero, Phonex, Midvale, UT

Autoreferencing nulls out sensor errors -  24-Jan-02 EDN-Design Ideas The autoreferencing circuit in Figure 1 nulls out the error of a sensor, such as a pressure transducer, at its reference level-for example, at ambient pressure.  The circuit is an analog-digital-feedback control system that uses a digitally programmable potentiometer to provide the variability__ Circuit Design by Chuck Wojslaw, Catalyst Semiconductor, Sunnyvale, CA

Autotransformer regulator inverts 12V to produce ­12V -  08/01/1997 EDN-Design Ideas You can create a dc/dc regulator with an internal switching MOSFET that inverts 12V to produce an output of 200 mA at ­12V.  The IC is a high-efficiency device whose low quiescent current   (120 µA maximum) is the product of a CMOS process that limits the absolute-maximum input-to-output voltage to 21V.   __ Circuit Design by Dana Davis

Auxiliary 12V Flyback SMPS -  Finally a use for those extra ferrites! __

Avoid problems with multiple DC-DC converters -  EDN-Design Ideas 05/05/2014     Improve DC-DC converter design and application, and avoid potential problems with this synchronization circuit__ Circuit Design by Avago Tech Note

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Voltage Converters:  #'s - B      C - K      L - Q      R - Z

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