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

Last Updated: November 30, 2017 10:29 AM

Circuits Designed by Dave Johnson, P.E. :
 

Low Battery Voltage FlasherThis circuit is designed to monitor two alkaline cells (3v) that form the battery often used in portable electronic equipment. . . Circuit by David Johnson P.E.-January, 1998

Low Frequency Oscillator draws only 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. . . Circuit by Dave Johnson P.E.-July, 2006

Low Power 40KHz Light DetectorThis circuit is designed for detecting infrared light modulated at around 40KHz.  Its feedback scheme cancels much of the DC component from ambient light.  Its conversion factor is about 100 millivolts per microwatt of 900nm light.. . . Circuit by David A. Johnson P.E.-July, 2006

Low Power LED FlasherJudging from the numerous references I have received, this electronic circuit, hobby circuit seems to be rather popular.  Many published circuits which flash LEDs need 3 or more volts.  This electronic circuit uses only a single inexpensive C-MOS IC and . . . Hobby Circuit designed by Dave Johnson P.E.-June, 2000

Low-power optical interrupterThis 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 Dave Johnson P.E.-June, 2000

Machine Vibration Triggers Hour MeterThis circuit allows an off-the-shelf battery powered digital hour meter to be turned on and off, according to a machine's operation, without requiring a direct electrical connection to the machine.  Machine vibrations are detected by an off-the-shelf piezo. . . Circuit by David Johnson P.E.-January, 1998

Micro Power 40Khz Burst Laser Diode DriverSome laser tag or simulated combat games can use this circuit to send short bursts of modulated laser light at the opponent's vest, equipped with a matching light receiver.  The circuit operates from three 1.5v cells (4.5v) that should provide enough energy. . . Circuit by David A. Johnson P.E.-June, 2000

Micro Power Over-Temperature 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. . . Circuit by David A. Johnson P.E.-June, 2000

Micropower CMOS Oscillator, Draws Only 0.5uaIf truly low power oscillators interest you, this circuit draws a mere 2 microwatts (500nA) from a 6v battery.  It uses a very inexpensive C-MOS IC to produce a frequency of 2Hz.  However, by changing the component values you can push it to 300Hz. . . Circuit by David A. Johnson P.E.-June, 2000


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

Low-Power Converter has Galvanic Isolation -  07/02/98 EDN-Design Ideas NOTE :  File has several circuits, please scroll to find this one.  Certain low-power applications require a simple, low-cost, galvanically isolated power supply.  Figure 1 shows a circuit that meets these requirements.  The dc/dc converter provIdeas a 12V, 150-mW output using only a few components and a small transformer.  The input can come from any power source that supplies 14 to 18V.  The CD4049 forms an oscillator that operates at approximately 200 kHz  (Figure 2) .  The asymmetry of the oscillator's waveform depends on the value of R.  The voltage VS in Figure 1 is proportional to the waveform's asymmetry. __ Circuit Design by JOSE CARRASCO, UNIVERSIDAD DE VALENCIA, SPAIN
Low-Power IC Packs GPS Receivers 7/31/01 -  App Note  Doc #953__ California Eastern Laboratories

Low-Power Interrupt Updates Real-Time Clock -  07/07/94 EDN-Design Ideas Some P-based systems need a real-time clock.  The P's built-in timer can do the work, but it usually requires several milliamps of current to keep the timer running.  If the main power drops, the clock requires a backup battery to operate.  The size of the backup battery __ Circuit Design by Yongping Xia, EBT Inc, Torrance, CA

Low-power keypad consumes only 100 nA -  24-Jan-02 EDN-Design Ideas Often in the use of products with keypads, one orkeys become "stuck" or are being pressed.  For example, a cell phone in the bottom of a purse or in a hip pocket could have one orof its keys inadvertently pressed and held down for a considerable period.  Depending on the circuit design and implementation of the keypad interface, this condition could cause excess current to flow, __ Circuit Design by Mike Mitchell, Texas Instruments, Dallas, TX

Low-power optical interrupter -  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 Dave Johnson P.E.-June, 2000

Low-Power PWM is simple, inexpensive -  01/06/00 EDN-Design Ideas A common technique for implementing PWM involves comparing a triangular waveform of fixed amplitude and frequency with a variable dc voltage level.  Although this approach results in a PWM signal of precise frequency and with duty __ Circuit Design by Anthony Smith, Scitech, Biddenham, England

Low-Power timer -  Low power timer.  It can operate with a CR2032 litium battely.   __ Designed by The Electronic Lives Manufacturing-presented Chan

Low-Power voltage-to-frequency converter makes a wireless probe for testing an inductive power supply -  05/26/05  EDN-Design Ideas Inductive pickup measures low-power circuit's supply __ Circuit Design by Francis Rodes, Eliane Garnier, and Salma Alozade, ENSEIRB Talence, France

Low-Power, low-voltage ADC is 0.05% linear -  06/19/97 EDN-Design Ideas The simple integrating 3V A/D converter in Figure 1a is small, requires no negative supply and no expensive precision components, and draws minimal supply current.   __ Circuit Design by John Wettroth, Maxim Integrated Products, Sunnyvale, CA

Low-Power, super-regenerative receiver targets 433-MHz ISM band -  02/02/06  EDN-Design Ideas Good for power-miserly battery-powered, shortrange, wireless applications __ Circuit Design by Cedric Mlange, Johan Bauwelinck, and Jan Vandewege, Ghent University, Ghent, Belgium

LT1304: Micropower DC/DC Converter with Independent Low-Battery Detector -  DN120 Design Notes__ Linear Technology/Analog Devices

LT1462/LT1463/LT1464/LT1465: Micropower Dual & Quad JFET Op Amps Feature PA Input Bias Currents & C-LoadTM Drive Capability -  DN136 Design Notes__ Linear Technology/Analog Devices

LT1500/LT1501 Low Noise Micropower DC/DC Converters -  DN151 Design Notes__ Linear Technology/Analog Devices

LTC1096 & 1098: Micropower SO-8 8-Bit ADCs Sample at 1kHz on 3A of Supply Current -  DN60 Design Notes__ Linear Technology/Analog Devices

LTC1451/52/53: 12-Bit Rail-To-Rail Micropower DACs in an SO-8 -  DN96 Design Notes__ Linear Technology/Analog Devices

Machine Vibration Triggers Hour Meter -  This circuit allows an off-the-shelf battery powered digital hour meter to be turned on and off, according to a machine's operation, without requiring a direct electrical connection to the machine.  Machine vibrations are detected by an off-the-shelf piezo. . . Circuit by David Johnson P.E.-January, 1998

Making Low Power & Low Voltages work in Analog Design -  App Note/ 747 / Jun-07) __ Maxim Integrated

Micro Power 40Khz Burst Laser Diode Driver -  Some laser tag or simulated combat games can use this circuit to send short bursts of modulated laser light at the opponent's vest, equipped with a matching light receiver.  The circuit operates from three 1.5v cells  (4.5v) that should provide enough energy. . . Circuit by David A. Johnson P.E.-June, 2000

Micro Power AM Broadcast Transmitters -  In this circuit, a 74HC14 hex Schmitt trigger inverter is used as a square wave oscillator to drive a small signal transistor in a Class C amplifier configuration.  The oscillator frequency can be either fixed by a crystal or made adjustable  (VFO) with a capacitor/resistor combination __ Designed by Bill Bowden

Micro Power Over-Temperature 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. . . Circuit by David A. Johnson P.E.-June, 2000

Micropower 4-and 8-Channel 12-Bit ADCs Save Power & Space -  DN153 Design Notes__ Linear Technology/Analog Devices

Micropower 600kHz Step-Up DC/DC Converter Delivers 5V at 1A from a Li-ION Cell -  DN179 Design Notes __ Linear Technology/Analog Devices

Micropower ADC has eight differential channels -  05/22/97 EDN-Design Ideas If you need a 12-bit ADC with eight differential channels for a portable, battery-powered data-acquisition system, you'll find that many 12-bit ADCs with configurable multiplexers are available.  However, they all suffer from as much as 50% channel reduction when you require differential inputs.  The circuit in Figure 1 overcomes the channel-reduction problem.  It provIdeas eight differential-channel, 12-bit A/D conversion.  The circuit uses a low-power, 12-bit, eight-channel ADC and a low-power, eight-channel multiplexer.  The system communicates with a host processor over a serial connection. __ Circuit Design by Kevin Hoskins, Linear Technology, Milpitas, CA

Micropower AM Band radio station -  The picture to the left is a high quality radio transmitter for the A.  M.  broadcast band.  The transmitter legally operates with "micro-power" and will not set any distance records but, unlike simpler designs, the frequency stays put and the fidelity is excellent.  Although the schematic looks somewhat complex, the circuitry is easy to build and adjust for experimenters with a little "tweaking" experience.  A simple output meter confirms proper signal level and checks antenna tuning while "on the air".  Add an audio mixer, tape recorder, and perhaps a CD player and have a near-professional micro-power station.   __ Contact: Charles Wenzel of Wenzel Associates, Inc.

Micro-power Band-pass Network -  Circuit Ideas for Designers App Note__ Advanced Linear Devices, Inc

Micropower Buck/Boosts Part 1: Converting Three Cells to 3.3V* -  DN109 Design Notes__ Linear Technology/Analog Devices

Micropower Buck/Boosts Part 2: Converting Four Cells to 5V* -  DN110 Design Notes __ Linear Technology/Analog Devices

Micropower Buffered Rail-to-Rail Adjustable Volatge Source -  Circuit Ideas for Designers App Note__ Advanced Linear Devices, Inc

Micropower Circuits for Signal Conditioning -  Linear Technology AN23 __ Designed by Jim WilliamsApr 1st, 1987

Micropower CMOS Oscillator, Draws Only 0.5ua -  If truly low power oscillators interest you, this circuit draws a mere 2 microwatts  (500nA) from a 6v battery.  It uses a very inexpensive C-MOS IC to produce a frequency of 2Hz.  However, by changing the component values you can push it to 300Hz. . . Circuit by David A. Johnson P.E.-June, 2000

Micropower DC/DC Converter with Independent Low-Battery Detector LT1304 -  DN120 Design Notes__ Linear Technology/Analog Devices

Micro-Power Flasher -  With this micro-power flasher you can baffle the intruders trying to break into your home.  The unit continuously emits flashing light both during day and night giving the impression that the...__ Electronics Projects for You

Micropower High-Side MOSFET Drivers -  AN53 Linear Technology This App Note describes the operation of high-side Nchannel MOSFET switch drivers designed specifically for operation in battery-powered equipment, such as notebook and palmtop computers and portable medical instruments.  A selection__ Linear Technology/Analog Devices

Micropower Integrating Current Sense -  This circuit takes advantage of the microampere supply current and Rail-to-Rail input of the LT1494.  Supply current is only 3uA during integration and 5uA at the end of integration.  __ Linear Technology/Analog Devices App Note, Mar 30, 2010

Micropower Multiplier/Divide -  The X, Y, and Z input amplifiers servo to control the emitter current of transistors according to the applied signals.  The transistors Vbe varies logarithmically to the current and so the emitter of Q2 includes the sum of the X and Y logs.  The Z signal log is provided at the Q4 base so the resultant Vbe at Q4 is Vbe1+Vbe2-Vbe3.  The output stage servo's the Q4 current to form the anti-log, so the resulting function __ Linear Technology/Analog Devices App Note, Jun 21, 2010

Micropower Photodiode Amplifier -  This is a basic photodiode amplifier which converts the tiny current output by the diode in response to light intensity to a buffered low impedance voltage source.  CMOS amplifier's allow for the use of large feedback resistors and add very little input bias error current.  For this Infra-Red diode the output changes 600mV for every us of photo induced power__ Linear Technology/Analog Devices App Note, Mar 16, 2010

Micropower Pulse Generator -  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. . . Circuit by David Johnson P.E.-June, 2000

Micropower Single Supply Applications: 1 a Self-Biased Buffered Reference 2 Megaohm Input Impedance Difference Amplifier -  DN23 Design Notes__ Linear Technology/Analog Devices

Micropower SO-8 8-Bit ADCs Sample at 1kHz on 3A of Supply Current LTC1096 & 1098 -  DN60 Design Notes__ Linear Technology/Analog Devices

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


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