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Last Updated: December 25, 2017 01:48 PM

Circuits Designed by Dave Johnson, P.E.

1 Watt Fluorescent Lamp Night LightIf you are tired of replacing small night light lamps, try this circuit.  The line powered circuit uses a long life cold cathode fluorescent lamp.  A simple charge pump technique runs the lamp without any transformer. . . Circuit by Dave Johnson P.E.-March, 1999

1.5v LED Flasher Version AMany published circuits that flash LEDs need 3 volts or more.  This circuit uses only a single inexpensive C-MOS IC and flashes the LED for a full year on a single 1.5 volt AA alkaline battery cell.  The circuit uses a charge pump technique to provide. . . Circuit by Dave Johnson P.E.-June, 2000

1.5V Touch Activated SwitchA single 1.5v silver oxide button cell powers this complete touch activated switch circuit for 5 years.  It features both a normally open and a normally closed set of solid-state switch thermals.  It also has an adjustable sensitivity, which can be set for a touch capacitance change as small as 1 picofarad.. . . Circuit by David A. Johnson P.E.-January, 2002

10 LED Sequential Flasher using Low PowrA while back I posted a flasher circuit which flashed 10 LEDs sequentially.  That circuit was powered by four AA alkaline cells.  The circuit below operates much the same way but has been modified to run from a single 3v CR2032 lithium coin cell. . . Circuit by Dave Johnson P.E.-April, 2011


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

"Chloroplast"Type 1 (Voltage Controlled) Solar Engine -  These designs are based on the Motorola MC34164-* micro power undervoltage sensing ICs.  They're pretty efficient, work at higher voltages than most solar engines, and can provide voltages for other logic circuits   (say, a microprocessor).  __ Designed by Wilf Rigter

"MicroPower"Type 1 (Voltage Controlled) Solar Engine -  Ken Huntington's fairly complex, but very efficient "micropower" solar engine design.  No 1381s or ICs needed. __ Designed by Ken Huntington

C Acts as Dedicated Motor-control -  09/11/98 EDN-Design Ideas (Scroll to find this circuit design)   Motion-control systems often use a PWM signal to control the duty cycle for a motor driver or amplifier module.    __ Circuit Design by Dylan Horvath, Gecko Sysytems Inc, Austin, TX

C controls charge pump as background task -  08/01/97 EDN-Design Ideas Because of power consumption and cost, designers of battery-powered devices mainly choose components that run at 3V or lower.  Unfortunately, many devices operate only at 5V, including LCDs with built-in drivers, programming lines of many EEPROMs and flash chips, and CMOS ADCs __ Circuit Design by Carlos Cossio, Santander, Spain

C implements Pushbutton Light Dimmers -  06/18/98 EDN-Design Ideas A project required building a synchronous-demodulator circuit to track a line drawn on paper.  beauty of  synchronous-modulator/demodulator approach is its inherent noise rejection.  File contains several circuits, scroll to find this one __ Circuit Design by William Grill, Riverhead Systems, Littleton, CO

C Provides Wireless Keypad Control -  10/08/98 EDN-Design Ideas -   (File contain several circuits.  Scroll to find this one)  Portable systems, such as telephone handsets, make extensive use of low-dropout  (LDO]regulators.  se components provide noise-sensitive parts with a stable power-supply line __ Circuit Design by Lloyd Khuc, Motorola Inc, Austin, TX

0 to 10 Volt Control for RC Servos -  This circuit takes standard 0-10V control voltage   (for example from analogue light controlling desk) and outputs a standard 1-2 ms RC servo motors control pulse.   __ Designed by Tomi Engdahl

0.14V RC Oscillator with Separate Logic Output Buffer -  Circuit Ideas for Designers App Note__ Advanced Linear Devices, Inc

0-10V control for RC servos -  This circuit takes standard 0-10V control voltage   (for example from analogue light controlling desk) and outputs a standard 1-2 ms RC servo motors control pulse.   __ Designed by Tomi Engdahl

1 Cell Flashes White LED -  12/11/03 EDN-Design Ideas Many portable appliances and other products that must operate from a single cell are restricted to working at very low voltages.  It is thus difficult to drive white LEDs that typically have a forward voltage of 3 to 5V.  The ability __ Circuit Design by Anthony Smith, Scitech, Biddenham, Bedfordshire, UK

1 component drives stepper Motor -  The extremely simple circuit in Fig 1 drives a stepper motor directly from 12V ac , 60 Hz power supply.  Usually you need switched-dc voltages to drive a stepper motor.  But a stepper motor will run off ac lines if you introduce a 90 phase shift between the voltages applied to the motor's two windings.  In this case only one 6.8uF non polarity capacitor is needed.   __ Contact: info @ wzmicro.com

1 FET controls LED array -  04/12/01 EDN-Design Ideas White-LED backlights are gaining acceptance because they offer higher reliability and simpler drive circuitry than backlights based on CCFL  (cold-cathode-fluorescent-lamp] and EL  (electroluminescent] technology.  As a result, white-LED backlights are increasingly common in PDAs  (personal digital assistants], cell phones, digital cameras, and other portable devices.  A design __ Circuit Design by Len Sherman, Maxim Integrated Products, Sunnyvale, CA

1 processor pin controls on/off function -  04/29/04  EDN-Design Ideas A recent Design Ideasprompted me to offer the simpler solution that I used in a recent project   (Reference 1].  We needed a momentary power switch with processor supervision.  This supervision would allow the processor to delay a powe __ Circuit Design by Michael Sirkis, Radio Systems, Logan Township, NJ

1 switch controls digital potentiometer -  09/19/02  EDN-Design Ideas This design idea     is an evolution and simplification of another   (Figure 1, Reference 1].  Replacing the three inverted-input NOR gates with their logical equivalents, positive-input NAND gates, makes these three gate symbols consistent __ Circuit Design by Jim Bach, Delphi Delco Electronics Systems, Kokomo, IN

1 Watt Fluorescent Lamp Night Light -  If you are tired of replacing small night light lamps, try this circuit.  The line powered circuit uses a long life cold cathode fluorescent lamp.  A simple charge pump technique runs the lamp without any transformer. . . Circuit by Dave Johnson P.E.-March, 1999

1 Wire Barometer -  By using a dual voltage supply, instrument precision and/or instrument range can be improved without adding significantly to the parts count.   __ Designed by A.G. Miller

1 wire brings power & data to LCD Module -  01/27/14EDN-Design Ideas If you need to connect a small remote LCD display, or your C has run out of I/O pins, heres a good, cheap solutionEmbedded systems frequently use HD44780type LCD displays as it is considered the most popular alphanumeric display controller.  The interface comprises at least 14 pins: eight for data, three for control   (EN, WR, RS), two for power supply   (Vdd, Vss), and one for contrast   (Vre).  Configured in 8bit mode, it requires at least 10 I/O lines   (D0D7, EN, RS).  Configured in 4bit mode, it requires at least six I/O lines   (D4D7, EN, RS) __ Circuit Design by  Benabadji Noureddine

1.5 Hour Lamp Fader (Sunset Lamp) -  The sunset lamp comes on at full brightness and then slowly fades out over 1.5 hours time and stays off until power is recycled.   __ Designed by Bill Bowden

1.5 Volt 1970's Style Caboose Marker Flashing Red LED Light -  A circuit that drives a red LED from a 1.5 volt battery and simulates an incandescent light.  Duty cycle can be changed by selecting resistor values __ Designed by Dick Cappels

1.5kW Induction Motor Speed Controller, Pt.2 -  Last month, we described the features of the 1.5kW Induction Motor Speed Controller and explained in detail how it works.  This month we describe its construction and testing and give some guidelines for use.__ SiliconChip

1.5V LED Flasher -  schematic only, no circuit description at this time __ Designed by Andrew R. Morris

1.5V LED Flasher Oscillator The 8-lead plastic mini-DIP LM3909 IC was developed by National Semiconductor in the mid 'seventies of the past century.  It was a monolithic oscillator specifically designed to flash Light Emitting Diodes.  By using the timing capacitor for voltage boost, it delivered pulses of 2 or more volts to the LED while operating on a supply of 1.5V or less.  The circuit was inherently self-starting, and required addition of only a battery and capacitor to function as an LED flasher __ Contact: Flavio Dellepiane, fladello @ tin.it

1.5v LED Flasher Version A -  Many published circuits that flash LEDs need 3 volts or more.  This circuit uses only a single inexpensive C-MOS IC and flashes the LED for a full year on a single 1.5 volt AA alkaline battery cell.  The circuit uses a charge pump technique to provide. . . Circuit by Dave Johnson P.E.-June, 2000

1.5V LED Flashers -  The LED flasher circuits below operate on a single 1.5 volt battery.  The circuit on the upper right uses the popular LM3909 LED flasher IC and requires only a timing capacitor and LED.  The top left circuit, designed by Andre De-Guerin illustrates using a 100uF capacitor to double the battery voltage to obtain 3 volts for the LED.  Two sections of a 74HC04 hex inverter are used as a squarewave oscillator that establishes the flash rate while a third section is used as a buffer that charges the capacitor in series with a 470 __ Designed by Bill Bowden

1.5V Touch Activated Switch -  A single 1.5v silver oxide button cell powers this complete touch activated switch circuit for 5 years.  It features both a normally open and a normally closed set of solid-state switch thermals.  It also has an adjustable sensitivity, which can be set for a touch capacitance change as small as 1 picofarad.. . . Circuit by David A. Johnson P.E.-January, 2002

1:4 BALUN -  Ham RadioBALUN, TUNERSSchematic __ Designed by Guy Roels ON6MU

10 Channel LED Sequencer -  The 4017 is a CMOS decade counter with 10 decoded outputs.  Inputs include a clock   (pin 14) , a reset   (pin 15) , and a clock inhibit   (pin 13) __ Designed by Bill Bowden

10 Channel Light Controller -  A 10 channel light controller using PWM/ up to 1a per channel at 12v __ Contact: P. Townshend EduTek Ltd

10 LED Chaser -  I don't know why, but people like blinking lights.  You see LED chasers everywhere, in TV shows   (Knight Rider) , movies, and store windows.  This schematic is my version of a simple 10 LED chaser.  There is no 555 timer used because __ Designed by Aaron Cake

10 LED Sequencer -  Schematic only, text in Finnish

10 LED Sequential Flasher using Low Powr -  A while back I posted a flasher circuit which flashed 10 LEDs sequentially.  That circuit was powered by four AA alkaline cells.  The circuit below operates much the same way but has been modified to run from a single 3v CR2032 lithium coin cell. . . Circuit by Dave Johnson P.E.-April, 2011

10 Stage LED Sequencer -  The 4017 is a CMOS decade counter with 10 decoded outputs.  Inputs include a clock   (pin 14) , a reset   (pin 15) , and a clock inhibit   (pin 13) __ Designed by Bill Bowden

10 Stage Light Sequencer -  schematic only -- flashes 10 low voltage bulbs, operates at10-25-Volt voltage, in PDF format, text in Finnish

10 to 100 LED Sequencer using a Matrix  -  The circuit above illustrates using a 10x10 matrix to sequence up to 100 LEDs with just three ICs and 20 transistors.  The two 4017 decade counters control the 10 rows and 10 columns so that one LED is selected depending on the output of the decade counters.  The LED circuit is drawn showing 25 LEDs and 10 transistors but can be expanded up to a 100 __ Designed by Bill Bowden

10-Channel IR Remote Control Receiver -  It works with commercial IR remote transmitters and is a snack to build.  The channels can be wired for momentary or toggle operation.__ SiliconChip

12 Stage Neon Sequencer NE 2/NE 51 -  This circuit is similar to the LED clock using 12 neon indicator lamps instead of LEDs.  It operates from 2 high capacity ni-cad cells   (2.5 volts) which keep it going for a couple weeks.  High voltage   (70 volts) for the neon lamps is obtained from a small switching power supply using a 74HC14 Schmitt trigger squarewave oscillator, high voltage switching transistor __ Designed by Bill Bowden

12 to 100 LED Sequencer using a Matrix -  The circuit above illustrates using a 10x10 matrix to sequence up to 100 LEDs with just three ICs and 20 transistors.  The two 4017 decade counters control the 10 rows and 10 columns so that one LED is selected depending on the output of the decade counters.  The LED circuit is drawn showing 25 LEDs and 10 transistors but can be expanded up to a 100 __ Designed by Bill Bowden

12 Volt 10 Amp Dark Activated Switch (kit available) -  The DAS1 is a combination manual switch and automatic dark-activated switch.  It is designed to control up to 10 amps of 12V lights.  A pair of high-intensity white LEDs are included in the circuit for built-in lighting.  The circuit includes a low voltage disconnect circuit that prevents excessive battery discharge on battery operated systems.  The DAS1 is ideal for solar powered lighting systems, it can also be used for line powered and automotive/marine applications.  External 12V lights consisting of white LEDs, incandescent lamps and/or fluorescent lamps can be driven by the DAS1. __ Designed by G. Forrest Cook

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Control Circuits:   #'s - A       B - C       D - G        H - L       M - P        Q - S        T - U        V - Z


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