"low-power" refers to components and circuits which are designed to have a lower power consumption than their common counterparts. This is most often a requirement because of limited available power, as in battery operated devices.

learn more… | top users | synonyms

0
votes
1answer
48 views

How to restrain this soft latching power switch from eating too much current?

I am designing a two buttons soft latching power switch for a project involving a raspberry pi, li-ion cells I salvaged from the battery of a broken laptop, and a power booster from adafruit. I ...
-4
votes
0answers
10 views

Mimo Sytems in wireless sensor network

I am a student and quite new to MIMO technology. I am trying to find answers for some questions . Any knowledge regarding would be really useful. Thanks a lot!
0
votes
1answer
46 views

How does this step up oscillator actually work?

I watched a Dave jones video on an energy harvester but I'm trying to figure out how the front end of this circuit actually resonates and how that steps up some small input voltage. Is it a function ...
0
votes
0answers
18 views

Ultrasonic transducer driver/receiver ultralow power issues

I'm looking how to easily drive ultrasonic transducer Prowave 500MB120 or similar from MSP430. I found TI: Ultrasonic Distance Measurement With the MSP430 and AnalogDevices-Ultrasonic Distance ...
-1
votes
0answers
24 views

Power line communications.Looking for a single channel to travel up to 1800 meters

I am in need of a Power line communication device. I need to receive a spst switch closure. Then I will send a 12vdc signal from my alarm circuit to a molded case circuit breaker able to receive a ...
1
vote
2answers
63 views

Detect power supply voltage threshold, while consuming very low current

Lead acid batteries get damaged by over-discharge somewhat like lithium polymer batteries. I need a circuit that will cut off the load from the battery when it drops below about 10v. That is the easy ...
14
votes
3answers
2k views

Why are vias bad?

I am designing a PCB with EAGLE and saw that it was trying to limit the amount of vias through the PCB. Why do you want less vias? Why are they bad? Do they bring extra manufacturing cost or is it ...
0
votes
1answer
31 views

When to use Battery Fuel gauge

I am designing a measuring instrument powered by a Li ion Cell, I need to display remaining battery capacity on it, so I was wondering what is good or lets say widely used method. Should I use full ...
0
votes
1answer
28 views

Supplying two mutually exclusive boards with one power supply in parallel?

I'm putting together a wireless Qi charger for my car that covers a square section of my dash, so where ever I put my phone, I have a connection. For it to work, I need six coils. There are prebuit ...
0
votes
1answer
44 views

Mosfet to save power

I am making a battery powered project which involves bi-directional motor control. However motor needs to turn rarely (about 10-20 seconds in 24 hour period). I am using L298 motor driver. However the ...
0
votes
0answers
26 views

Send unique ID when powered (low-power)

I'm looking for a simple chip that simply sends its unique ID(eg.: number) when it powered. Thus it uses iPhone's line-out plug, I only have less than 1.5V. (Or 0.894V, I checked on Wikipedia, but I ...
0
votes
1answer
44 views

Diodes to drop voltage for RF module

I am making a standalone battery powered arduino project which uses nRF24L01+ for radio communication. nRF draws 20 mA current max. Can I use 3xAA cells along with 2 diodes (which drop 0.6*2 = 1.2 V) ...
0
votes
1answer
39 views

Non-diode OR-ing solution for n equivalent power sources

I wish to allow powering my circuit using at least one of 3 connectable periphals. For example, my application could have 3 usb ports that each connect to different usb hosts. Any combination with at ...
0
votes
1answer
50 views

12V Low battery indicator that has minimal power draw

I'm wanting to make a simple low battery indicator for 12V SLA battery - just an LED that lights when the voltage gets below a certain level. What sort of power would a circuit like this ...
0
votes
0answers
17 views

Ultra Low Power Capacitive Power On Switch

For a design, I like to build a capacitive power on/off button that I can power directly from battery. Ideally such solution should only consume nA level power and when person touches to turn on it ...
1
vote
1answer
45 views

Finding the Pull-up Resistor Value

I am designing a wireless sensor node that will be operating off of 1.8V. I am using an Atmel ATtiny861a MCU with a CC2520EMK radio and a 23A1024 External memory chip. I have a chip select pin for ...
1
vote
1answer
80 views

What benefits we have in reduction in clock cycles

If I implement a function with multiple algorithms but all providing same functionality and measure total number of clock cycles required to execute the program on a MCU platform, what benefits will ...
2
votes
1answer
50 views

Battery powered project with multiple voltages

I am working on a project which requires three different voltage levels - Motor that can run at 7-12 V. Hall sensor that can run at 5-25 V. nRF24L01+ that can run at 2-3.6 V and AVR (arduino) which ...
3
votes
2answers
61 views

Difference between Quiescent Current & Shutdown current?

What is the difference between Quiescent current & shut down current. I have searched a lot but didn't find valid answer. As per as my knowledge Quiescent current is the small current which flows ...
0
votes
4answers
122 views

Proper Way of Powering a Circuit with 2 AA Batteries [closed]

That is a real primitive question. a) Many MCUs and SOCs are able to work @3V (-/+ 0.3V) b) This is voltage of 2 AA (or AAA) batteries And the real question is: What is the legitimate way to ...
2
votes
0answers
58 views

Redundancy in power supply [closed]

How is redundancy of power supply from converters done in satellites? can anyone explain with complete details.Is it possible to get the actual design from power system of any mini-satellites ? Is the ...
0
votes
0answers
37 views

Complex system circuit design and simulation

I'm building a solar powered GPS tracking device using an Ieik Mini Nano V3.0 Atmega328p microcontroller board (based on Arduino Nano), Adafruit Fona GSM module, Ublox NEO-6M GPS module. The GPS ...
1
vote
1answer
133 views

How can I accurately estimate the power consumption of a GPS tracking device?

I'm building a solar powered GPS tracking device using an Ieik Mini Nano V3.0 Atmega328p Board (based on Arduino Nano), Adafruit Fona GSM module, Ublox GPS module. The GPS module will transmit ...
0
votes
1answer
55 views

Which end of a barrel connector is positive

I am having trouble understanding barrel connectors. From what I read online either the inside or the outside can be positive or negative depending on the direction of the current. SO which end is ...
0
votes
0answers
19 views

Qualcomm and phone power comsumptions

There are some links about qualcomm and phone power consumptions: http://www.notebookcheck.net/Qualcomm-Snapdragon-800-MSM8974-SoC.103706.0.html ...
1
vote
1answer
63 views

Can I dynamically change STM32 voltage during runtime

I'm using an STM32L151 MCU for a battery powered wireless sensor node. I came across the TPS6274x series switching regulator, who's voltage can be reconfigured at runtime by flipping it's inputs. The ...
1
vote
4answers
85 views

Use GPIO to disable voltage divider

I'm using a voltage divider to read the battery level of a wireless sensor platform using STM32L151. I'm shooting to use 20k for R1 and 10k for R2, to be under the 50k limit of the MCU's ADC ...
0
votes
1answer
106 views

MSP430 waking up every millisecond, what power usage to expect?

I have an MSP430 waking up every millisecond from a timer interrupt (to do a tiny amount of work, ie increment a counter and check a couple of input pins). It is set up to run at 25MHz. What should ...
0
votes
1answer
66 views

How to send the RC522 RFID reader into sleep mode?

I'm trying to get the power consumption of a MFRC522 RFID module down, currently while running it consumes about 4mA. There should be a way to put it into sleep mode, I just can't find any ...
2
votes
1answer
78 views

Measuring GameBoy power consumption

I am currently developing my own homebrew GameBoy game and I would like to try some tricks to reduce power consumption (for the sake of learning). The GameBoy has a HALT instruction that will stop ...
0
votes
2answers
122 views

Passive voltage drop from 6V DC to 5V DC for 3W circuit

I plan to put an Arduino onboard of my hub-generator powered bicycle circuitry. Currently, I have a circuit consisting of: 6V/3W AC hub generator (variable frequency and power); Rectifier bridge; ...
0
votes
1answer
37 views

low current buck converter

Just trying to find a suitable buck converter for my application, which is running off ~10-50V (12/24/48V battery banks) and supplying normally a very low load microcontroller (~1mA) but occasionally ...
0
votes
1answer
72 views

Loudest Piezo with low voltage and current?

I am making a board which will communicate wirelessly with a smart phone. When I send a specific command, I want it to sound an alarm to the user, making it able to be found when lost. I've got ...
0
votes
1answer
61 views

How do simple low power devices store setup when switched off?

I often come across battery powered items that store their state when switched off, particularly 'simple' items like LED bicycle lights (e.g. flash or solid light, changing each time it is switched ...
0
votes
1answer
51 views

Maintaining DC voltage with more batteries

I have a circuit which i am powering with two 1.5V AA batteries that dies at 2.6V volt as the battery discharges. Reading around, i realized that even though there is energy in the batteries, my ...
0
votes
1answer
39 views

Choose between Bluetooth Low Energy advertizing and connection for low-power small-data application

I have several sensors running on coin batteries, which are supposed to send data to a central device periodically. The data size is small: the meaningful data should be a few bytes excluding the BLE ...
0
votes
0answers
49 views

Low power design

I'm working on a project, it consist to collect data from sensor : HTU21D for humidity and Temp (digital I2C) LDR for light (Analog ADC) Potentiometer for adjustment (Analog ADC) communicate the ...
1
vote
1answer
51 views

MP3-25 flexible solar panel providing low current

I am working on a project where I need about 20 mA to come from a particular solar panel I am in possession of. The solar panel is an MP3-25 panel, I actually have 2 which I am trying to get to work. ...
1
vote
1answer
52 views

Role of Capacitors with additional power regulator

I have a a 7805 voltage regulator that has a capacitor on input and output. The 5v from that regulator is then elsewhere in the circuit stepped down to 3.3v with another regulator. I am wondering if ...
0
votes
0answers
58 views

Is it possible to produce 1 Hz flashes from a “joule thief?”

The joule thief circuit below produces a high-rate flashing LED. How can I slow the flash rate down to approximately 1 Hz? ...and will this be as efficient as a simple hex Schmitt inverter with a ...
0
votes
1answer
80 views

Power regulation and isolation for low current device

I'm looking for a solution to regulate power and provide isolation for a 3.3VDC system. I am using a 5VDC 500mA power supply that needs to be regulated to 3.3VDC with isolation to protect analog ...
0
votes
1answer
37 views

isolated voltage

I am looking to add an isolated 10-12V supply capable of producing ~200mA to an existing circuit which has 5V and 12V rails available on the board. I would prefer to use the latter (12V) as it can ...
0
votes
1answer
74 views

power supply and transfering data from smartphone via jack 3.5mm 4pin

In my Project, I was wondering if I can use the 3.5mm jack (4 pin) to transfer data and as power supply to my small circuit? So I'm just asking if it's possible? and if yes, can someone tell me how ...
0
votes
2answers
104 views

Help please! I need to give constant current to an LED from a Lipo battery

I'm trying to drive an LED from a Lipo battery. The useable voltage range of the Lipo goes from 4.2V down to 3.4V, and the forward voltage of the LED is 3.2V. With a resistor in series with the LED, ...
0
votes
2answers
99 views

Shut down regulator during sleep

I'm working on a wireless sensor network and would like to know what it would take to shut down the regulator during deep sleep. MCU: STM32L151C6T6 Regulator: TPS63001 Radio: RFM69HW LCD: some ...
2
votes
1answer
62 views

psIsolation Transformer DC 12 volts

I want to use 12 volts DC and step it up to 400 volts AC or higher at 100khz. I am buiding a signal generator that outputs a sine wave or square wave with an adjustable frequency of up to 100 kHz. I ...
5
votes
3answers
931 views

Simple, efficient “breathing” LED circuit

I'm currently working on a small circuit, which I intend on running off a CR2032. The intent is to have the circuit last at least 2 weeks (the longer the better), pulsing a green LED every 3 seconds, ...
0
votes
0answers
97 views

Dual redundant 1.5V battery power system?

I'm trying to build an efficient way to connect two 1.5V alkaline batteries in a redundant configuration for my circuit. I only want one battery to be supplying power to the circuit at any given time. ...
1
vote
1answer
76 views

Should I use a voltage regulator?

I'm powering an attiny45 from a single lithium ion battery; that when fully charged should have a maximum voltage of ~4volts and will be cutoff at 3volts. I was thinking I should be safe to just ...
0
votes
2answers
122 views

Low voltage cutoff circuit

I'm powering an attiny45 from a lithium ion battery; using these batteries the voltage cannot get below 3volts or it will damage the cell. How should I go about cutting the voltage out? Software, or ...