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

Last Updated: December 07, 2017 02:05 PM

Circuits Designed by Dave Johnson, P.E. :

Micropower Pulse GeneratorIt is hard to design a pulse generator that produces clean logic pulses while drawing very low current.  This circuit is designed to produce short 2mS pulses at a rate of one per second while drawing only 1 microamp from a 9 volt battery. . . Circuit by David Johnson P.E.-June, 2000

Momentary 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. . . . Hobby Circuit designed by David A. Johnson P.E.-January, 2002

Monitors Pump MotorThis circuit solves this problem in a novel way.  It clips on the outside of the pump motor’s power cable and provides a transistor switch closure whenever the circuit detects current flowing to the motor.  The circuit draws so little current that a small lithium cell will power the circuit for yearsCircuit Solution by Dave Johnson P.E.-November, 2004

Motion Alarm using piezo DeviceAn inexpensive piezoelectric device is used as a motion sensing device for this motion alarm. . . Circuit by David A. Johnson P.E.-July, 2006

Nine-Volt Battery EliminatorIf you use 9v battery powered devices for long periods of time, you may get tired of constantly changing batteries.  The circuit below can be wired into any 9v battery powered device, drawing power from an external AC to DC power adapter.  I designed the circuit. . . Circuit by David Johnson P.E.-December, 2009

Nine-Volt Battery Voltage MonitorThis circuit turns on a LED whenever the voltage of a standard 9v battery connected to the circuit drops below 7.2 volts.  It uses a LTC1440 comparator, which also contains a 1.18v reference diode.  In standby mode, the circuit draws only 4uA. . . Circuit by Dave Johnson P.E.-July, 2006

One-Line Telephone Line Status Indicator This circuit monitors one phone line. . . Circuit by Dave Johnson P.E.-June, 2000

Optical Interrupter Draws MicroampsThis circuit is great for battery-powered systems that use slotted type optical interrupters.  It draws only 10uA from a 3v battery that should allow up to 5 years of operation from a lithium battery. . . Circuit by David Johnson P.E.-June, 2000

Oscillator Draws 2 NanoampsIf you have hundreds of touch switches that need an excitation signal, then this circuit is what you need.  Its 20KHz 20v peak to peak output signal can supply up to 3 watts of touch switch excitation power . . . Hobby Circuit designed by David A. Johnson P.E.-July, 2006

Over-Temperature Micro-Power AlarmThe circuit is powered for years by a single 3 volt lithium battery.  It sounds an alarm when the temperature exceeds a certain point.  With some minor changes the circuit could also be configured for an under temperature (freeze) alarm.  The circuit uses a . . . Hobby Circuit designed by David A. Johnson P.E.-June, 2000

Piezoelectric Device used for Motion AlarmAn inexpensive piezo wafer is used to detect vibration and when the vibration is sufficient a switch is activated . . . Hobby Circuit designed by Dave Johnson P.E.-July, 2006

Pop Free Microphone On/Off Switch CircuitThis circuit uses a simple technique to eliminate the usual “pop” sound when an electret type microphone is switched on or off.  The circuit is completely passive and will work on dynamic and electret type microphones. . . Circuit by David A. Johnson P.E.-February, 2002

Precision Fullwave RectifierI have used this handy circuit many times.  It accurately converts an AC signal into pulsing DC, which can be filtered to provide an average of the input voltage.  It works from millivolts to volts.  The circuit shown requires a stable +5v reference if a. . . Circuit by David Johnson P.E.-February, 2002

Precision Ultra Lower Power OscillatorThis circuit works much like the classic 555 timer, but draws only about 1.5 microamps from a 3 volt battery.  It is highly stable under varying temperature and supply voltages. . . Circuit by David Johnson P.E.-May, 2000

Pulse Generator uses MicropowerIt is hard to design a pulse generator that produces clean logic pulses while drawing very low current.  This circuit is designed to produce short 2mS pulses at a rate of one per second while drawing only 1 microamp from a 9 volt battery . . . Hobby Circuit designed by David A. Johnson P.E.-June, 2000

Pump Motor MonitorThis circuit can turn on a light or sound a beeper, whenever an AC line powered pump motor turns on.  It is designed to detect the motor current using a small inductor placed on the outside of the motor’s power cable.  No direct wire contact is needed. . . Circuit by Dave Johnson P.E.-November, 2004

Rectifier-FullwaveI have used this handy circuit many times.  It accurately converts an AC signal into pulsing DC, which can be filtered to provide an average of the input voltage.  It works from millivolts to volts.  The circuit shown requires a stable +5v reference if a . . . Hobby Circuit designed by David Johnson P.E.-February, 2002

Replace a Pushbutton Switch with this Infrared Safety SwitchUsing a slotted optical sensor, this circuit can be used as a replacement for a large mushroom pushbutton safety switch . . . Hobby Circuit designed by Dave Johnson P.E.-July, 2006


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

MicroPower Solar Engine -  A 'micro power solar engine' has been a goal since my introduction to BEAM Robotics.  I believe that if there wasn't one before, I there is one now.  What I'm presenting to you looks very similar to one of the circuits found in Steven Bolt's web pages.  As you will see, I made only minor changes to that design and not without help.   __ Designed by Ken Huntington

Micropower Thermocouple Signal Conditioner with Cold Junction Compensation -  A thermistor, shown as R3, is used to monitor the cold junction temperature.  Its resistance becomes smaller as the cold junction temperature increases.  An increase in cold junction temperature will reduce the output voltage of the Type J thermocouple by 52uV/C.  The voltage reference and scaling of resistor values creates an __ Linear Technology/Analog Devices App Notes, Jun 21st 2011

Micropower, 10ppm/°C, ±5V Reference -  The left opamp precisely amplifies the 1.2V shunt reference to +5V and the right section inverts that to make -5V.  __ Linear Technology/Analog Devices App Note, Jun 21st 2011

Micropowers for Signal Conditioning -  AN23 Low power operation of electronic apparatus has become increasingly desirable.  AN23 describes a variety of low power circuits for transducer signal conditioning.  Also included are designs for data converters and switching regulators.  Three appended sections discuss guidelines for micropower design, strobed power operation and effects of test__ Linear Technology/Analog Devices

Microprocessor generates programmable clock sequences -  05/12/05 EDN-Design Ideas imulate radar and sonar returns with simple circuit __ Circuit Design by William Grill, Honeywell BRGA, Lenexa, KS

Momentary 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. . . . Hobby Circuit designed by David A. Johnson P.E.-January, 2002

Monitors Pump Motor -  This circuit solves this problem in a novel way.  It clips on the outside of the pump motor’s power cable and provides a transistor switch closure whenever the circuit detects current flowing to the motor.  The circuit draws so little current that a small lithium cell will power the circuit for yearsCircuit Solution by Dave Johnson P.E.-November, 2004

Motion Alarm using piezo Device -  An inexpensive piezoelectric device is used as a motion sensing device for this motion alarm. . . Circuit by David A. Johnson P.E.-July, 2006

Motor-controller uses fleapower -  09/25/03  EDN-Design Ideas A simple, permanent-magnet dc motor is an essential element in a variety of products, such as toys, servo mechanisms, valve actuators, robots, and automotive electronics.  In many of these applications, the motor must rotate in a gi __ Circuit Design by Anthony Smith, Scitech, Biddenham, Bedfordshire, UK

NanoPower LC Colpitts Oscillators -  Circuit Ideas for Designers App Note__ Advanced Linear Devices, Inc

New Comparators Feature Micropower Operation Under All Conditions -  DN137 Design Notes__ Linear Technology/Analog Devices

New Micropower Low Dropout Regulators Ease Battery Supply Designs -  DN121 Design Notes__ Linear Technology/Analog Devices

Nine-Volt Battery Eliminator -  If you use 9v battery powered devices for long periods of time, you may get tired of constantly changing batteries.  The circuit below can be wired into any 9v battery powered device, drawing power from an external AC to DC power adapter.  I designed the circuit. . . Circuit by David Johnson P.E.-December, 2009

Nine-Volt Battery Voltage Monitor -  This circuit turns on a LED whenever the voltage of a standard 9v battery connected to the circuit drops below 7.2 volts.  It uses a LTC1440 comparator, which also contains a 1.18v reference diode.  In standby mode, the circuit draws only 4uA. . . Circuit by Dave Johnson P.E.-July, 2006

One-Line Telephone Line Status Indicator -  This circuit monitors one phone line. . . Circuit by Dave Johnson P.E.-June, 2000

Op Amp Comparator & Reference IC Provides Micropower Monitoring Capability Design Note 190 -  DN190 Design Notes__ Linear Technology/Analog Devices

Optical Interrupter Draws Microamps -  This circuit is great for battery-powered systems that use slotted type optical interrupters.  It draws only 10uA from a 3v battery that should allow up to 5 years of operation from a lithium battery. . . Circuit by David Johnson P.E.-June, 2000

Oscillator Draws 2 Nanoamps -  If you have hundreds of touch switches that need an excitation signal, then this circuit is what you need.  Its 20KHz 20v peak to peak output signal can supply up to 3 watts of touch switch excitation power . . . Hobby Circuit designed by David A. Johnson P.E.-July, 2006

Over-Temperature Micro-Power Alarm -  The circuit is powered for years by a single 3 volt lithium battery.  It sounds an alarm when the temperature exceeds a certain point.  With some minor changes the circuit could also be configured for an under temperature  (freeze) alarm.  The circuit uses a . . . Hobby Circuit designed by David A. Johnson P.E.-June, 2000

Piezoelectric Device used for Motion Alarm -  An inexpensive piezo wafer is used to detect vibration and when the vibration is sufficient a switch is activated . . . Hobby Circuit designed by Dave Johnson P.E.-July, 2006

Piezoelectric Energy Harvester & 1.2V Secondary Rail -  The LTC3388-1/LTC3388-3 are high efficiency step-down DC/DC converters with internal high side and synchronous power switches that draw only 720nA typical DC supply current at no load while maintaining output voltage regulation.  The EN pin can be used to activate the LTC3388-1/LTC3388-3.  For instance, in this circuit the __ Linear Technology/Analog Devices App Note, Jul 23, 2010

Pop Free Microphone On/Off Switch Circuit -  This circuit uses a simple technique to eliminate the usual “pop” sound when an electret type microphone is switched on or off.  The circuit is completely passive and will work on dynamic and electret type microphones. . . Circuit by David A. Johnson P.E.-February, 2002

Power-Miserly Voltage Reference Needs Just One Pin -  20-Aug-09 EDN-Design Ideas A capacitor holds a reference voltage so that the microcontroller pin can perform other tasks __ Circuit Design by Peter T Miller, Applied Inspirations LLC, Bethlehem, CT

Precision Fullwave Rectifier -  I have used this handy circuit many times.  It accurately converts an AC signal into pulsing DC, which can be filtered to provide an average of the input voltage.  It works from millivolts to volts.  The circuit shown requires a stable +5v reference if a. . . Circuit by David Johnson P.E.-February, 2002

Precision Ultra Lower Power Oscillator -  This circuit works much like the classic 555 timer, but draws only about 1.5 microamps from a 3 volt battery.  It is highly stable under varying temperature and supply voltages. . . Circuit by David Johnson P.E.-May, 2000

Pulse Generator uses Micropower -  It is hard to design a pulse generator that produces clean logic pulses while drawing very low current.  This circuit is designed to produce short 2mS pulses at a rate of one per second while drawing only 1 microamp from a 9 volt battery . . . Hobby Circuit designed by David A. Johnson P.E.-June, 2000

Pump Motor Monitor -  This circuit can turn on a light or sound a beeper, whenever an AC line powered pump motor turns on.  It is designed to detect the motor current using a small inductor placed on the outside of the motor’s power cable.  No direct wire contact is needed. . . Circuit by Dave Johnson P.E.-November, 2004

Rectifier-Fullwave -  I have used this handy circuit many times.  It accurately converts an AC signal into pulsing DC, which can be filtered to provide an average of the input voltage.  It works from millivolts to volts.  The circuit shown requires a stable +5v reference if a . . . Hobby Circuit designed by David Johnson P.E.-February, 2002

Replace a Pushbutton Switch with this Infrared Safety Switch -  Using a slotted optical sensor, this circuit can be used as a replacement for a large mushroom pushbutton safety switch . . . Hobby Circuit designed by Dave Johnson P.E.-July, 2006

Reset generator uses "fleapower" -  06/27/02 EDN-Design Ideas When a processor-controlled device must operate reliably, designers often choose to periodically reset the processor rather than rely on a watchdog configuration.  In low-power systems, this periodic-reset circuit can consume a large part of the system's current budget or may fail to operate at low voltages __ Circuit Design by Philip Simpson, Maxim Integrated Products, Reading, UK

RFID Transponder-Low Power -  This is the Grand Prize winner in the design category of the 1993 RF Design Awards Contest.  This entry exhibited both innovative use of RF technology and an elegant implementation of that technology __ Designed by  Raymond Page

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


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