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MicroPower  Circuits
Low Power (flea power): #'s - K        L - R        S- Z
 

Last Updated: October 24, 2017 02:55 PM

Circuits Designed by Dave Johnson, P.E. :

 

Version a of 1.5v LED FlasherTo squeeze even more energy from a alkaline battery cell, this circuit adds two transistors to a circuit similar to the above design to boost the efficiency.  A small 1.5 volt alkaline N cell should flash the LED for a full year.  It too uses a "charge pump" technique to provide a LED the needed voltage. . . Circuit by David Johnson P.E.-June, 2000

Very Loud 3v Powered BeeperGetting a high sound intensity from a piezoelectric type beeper is not easy when the available DC supply is only 3v.    The circuit below is not only efficient but produces a very intense sound.    The circuit combines a voltage boost section with a resonant. . . Circuit by David A. Johnson P.E.-February, 2009

Very Low Voltage Oscillator CircuitOK, you may not ever need an oscillator to function using a power supply voltage below one volt, but if you ever do need one, here is one way to do it.  Getting any electronic circuit to operate below one volt is a real challenge.  Typical silicon bipolar . . . Hobby Circuit designed by David Johnson P.E.-October, 2008

Voltage Limiting with a SupercapacitorSupercapacitors are working their way into more and more applications where electrical energy needs to be stored.  These robust devices can be charged and discharged 1000s of times and will typically outlast a battery . . . Hobby Circuit designed by David A. Johnson P.E.-March, 2010

Voltage Monitor for a 9v BatteryNine voltage batteries are used in a wide variety of electronic devices.  But, you often don’t know when it is time to change the battery until the device stops operating.  The hobby circuit below provides a visual indication when the battery needs to be . . . Hobby Circuit designed by David Johnson P.E.-July, 2006

Watt-Hour Meter MonitorHave you ever wondered how much power your house or apartment is using?  Most watt-hour meters are like the one shown below.  Some newer ones have a digital display but there millions of these older models still in use . . . Hobby Circuit designed by David A. Johnson P.E.-September, 2008

Wire Loop Security AlarmA wire is looped through various objects which are to be monitored.  The loop wire is typically an aircraft cable but could also be any insulated stranded wire.  The loop is attached to a table or desk.  Should the loop be cut, the alarm is sounded . . . Hobby Circuit designed by Dave Johnson P.E.-December, 2004


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

V/F Converter Draws Flea Power -  04/24/97 EDN-Design Ideas The V/F converter in Figure 1 is unique because it draws less than 30 µA from one unregulated supply while converting bipolar input voltages.  It produces three CMOS -compatible, 0to 10-kHz outputsone  (F+]that becomes active when the input voltage is positive, another  (F­]that takes __ Circuit Design by W Stephen Woodward, University of North Carolina, Chapel Hill, NC

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

Version a of 1.5v LED Flasher -  To squeeze even more energy from a alkaline battery cell, this circuit adds two transistors to a circuit similar to the above design to boost the efficiency.  A small 1.5 volt alkaline N cell should flash the LED for a full year.  It too uses a "charge pump" technique to provide a LED the needed voltage. . . Circuit by David Johnson P.E.-June, 2000

Very Loud 3v Powered Beeper -  Getting a high sound intensity from a piezoelectric type beeper is not easy when the available DC supply is only 3v.    The circuit below is not only efficient but produces a very intense sound.    The circuit combines a voltage boost section with a resonant. . . Circuit by David A. Johnson P.E.-February, 2009

Very Low Voltage Oscillator Circuit -  OK, you may not ever need an oscillator to function using a power supply voltage below one volt, but if you ever do need one, here is one way to do it.  Getting any electronic circuit to operate below one volt is a real challenge.  Typical silicon bipolar . . . Hobby Circuit designed by David Johnson P.E.-October, 2008

Very Low-Power Inrush-Current Limiter Protects Hot-Pluggable Apps -  Inrush current occurs in many circuits that are hot-plugged into a power supply or battery, causing the input load capacitor to experience a sudden surge of current.  This surge can damage or degrade the input capacitor, generate a __ Designed by Narek Pezeshkian

Volt/F Converter Draws Flea Power -  04/24/97 EDN-Design Ideas The V/F converter in Figure 1 is unique because it draws less than 30 µA from one unregulated supply while converting bipolar input voltages.  It produces three CMOS -compatible, 0to 10-kHz outputsone  (F+]that becomes active when the input voltage is positive, another  (F­]that takes __ Circuit Design by W Stephen Woodward, University of North Carolina, Chapel Hill, NC

Voltage Limiting with a Supercapacitor -  Supercapacitors are working their way into more and more applications where electrical energy needs to be stored.  These robust devices can be charged and discharged 1000s of times and will typically outlast a battery . . . Hobby Circuit designed by David A. Johnson P.E.-March, 2010

Voltage Monitor -  This voltage monitor circuit is based on an Elektor design with a 555 timer IC in the book 302 Circuits, which uses two LEDs  (red and green) to indicate whether the voltage is within range.  must register on this site __ Designed by Published in Elecktor July/Aug, 2014

Voltage Monitor -  When the input voltage is 0 the LED glows.  The LED stops glowing when the voltage rises to the level determined by R2.  Reverse + and, pins to reverse operating mode.  To set voltage at which LED goes  __ Contact: IQ Technologies

Voltage Monitor for a 9v Battery -  Nine voltage batteries are used in a wide variety of electronic devices.  But, you often don’t know when it is time to change the battery until the device stops operating.  The hobby circuit below provides a visual indication when the battery needs to be . . . Hobby Circuit designed by David Johnson P.E.-July, 2006

Watt-Hour Meter Monitor -  Have you ever wondered how much power your house or apartment is using?  Most watt-hour meters are like the one shown below.  Some newer ones have a digital display but there millions of these older models still in use . . . Hobby Circuit designed by David A. Johnson P.E.-September, 2008

Wide VIN Range Step-Down Regulators Consume Only 2.8μA Input Current -  Battery life is paramount in modern battery-powered systems.  portable applications, such as remote sensors, require voltage regulators which have low current standby states and also able to provide bursts of high power.  Linear Technology’s LT®3970/LT3971 lead the industry in low current standby mode by consuming only __ Linear Technology/Analog Devices App Note, John Gardner-Design Engineer Power Products May 23, 2011

Wire Loop Security Alarm -  A wire is looped through various objects which are to be monitored.  The loop wire is typically an aircraft cable but could also be any insulated stranded wire.  The loop is attached to a table or desk.  Should the loop be cut, the alarm is sounded . . . Hobby Circuit designed by Dave Johnson P.E.-December, 2004

Wireless battery energizes low power Devices -  11/22/07  EDN-Design Ideas A simple 13.56-MHz oscillator broadcasts power to a receiver circuit __ Circuit Design by Carlos Cossio, Santander, Spain

Zero-Bias Detector Yields High Sensitivity Weith Nanopower Consumption -  Magazine Design Idea  s February 1998__ Linear Technology/Analog Devices

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