"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.

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57 views

LDO regulator below minimum input voltage

I'm designing a circuit that will run from 3V battery. The battery can get as low as 2V and I want to use it as much as I can. I'm using a PIC24 that operates with the integrated regulator for ...
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1answer
36 views

Battery Bank - How to achieve full amp-hour ratings with simultaneous series & parallel connections?

I have four 12V batteries (all with the same watt-hour rating), and I would like to achieve dual voltages by interconnecting them, while achieving the following: 48V at the full amp-hour rating of ...
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0answers
22 views

Which appropriate DSP to calculate FFT(1024 pt) in a short time and with low power consumption? [closed]

I want to choose a DSP 3.3 V I/O to calculate FFT (1024 pts) in a short time and with a low power consumption because it will powered via an energy harvesting Thanks
3
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3answers
84 views

How to efficiently power wireless sensor node from a 9V battery?

Context I have recently set out to add some wireless features to my entry-level smoke detector. Problem In order to achieve that, I will be adding a custom pcb embedding an ATmega328P and a ...
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4answers
67 views

Implement ac-dc converter for low frequency and very low voltage without external powering?

Iam using a basic cascade voltage multiplier to boost and rectify the 0.3v ac signal. The circuit rectifies but the boost is very less. So I thought of using LTC3105 after this stage to get a ...
2
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2answers
64 views

Low power device in sealed unit — design help

Main question: can I build an arduino-based sensor that'll use such low power that something like inductive charging will suffice to power it? Details: I've got a "holding tank" on my boat ... a ...
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0answers
63 views

controller pins issue during hot swapping

I am using CortexM3 controllers(LPC1769,1778) in my embedded applications. I terminated UART pins to the connectors with TTL level. If I am connecting or disconnecting the UART cable during power on ...
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1answer
50 views

Does it use less power to process and compress data on a chip, or to transmit it to a station?

Let's say I had a grid of force resistors laid out in a pad. Every 5 minutes I'd apply power to the pad and read the resistance of every force resister. The pad itself would be powered by a battery, ...
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0answers
26 views

Is Energia buggy when it comes to using Serial.print() near sleepSeconds() call?

So, I've been experimenting with sleep, sleepSeconds, suspend() and wakeup. These are AWESOME by the way... Here's what I've found. suspend() puts the controller into LPM4 which makes it ONLY come ...
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1answer
44 views

Measuring quiescent current of a voltage regulator

I purchased 10PCS Socket Adapter plate Board For NRF24L01+ Wireless Transceive​ module and would like to know how much current/power it will draw as I want to run a project on batteries. A close-up ...
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1answer
44 views

Lighting LEDs from high current source [duplicate]

I have an circuit with six high torque servos connected parallel to power brick that provides 5V @5Amps. Everything is running fine. But I wanted to add few LEDs to circuit but I dont know how do I do ...
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1answer
54 views

What's the most efficient way to detect a break in a circuit [closed]

I'm building a sensor that detects when a refridgerator door is left open. my goal is to use 2 contacts that close the circuit when the door is closed. So, when the door is opened, the contacts open ...
1
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1answer
41 views

How do you use low-power mode on an MSP430G2553 using an Energia sketch?

I am using an energia sketch to program my MSP430G2553 controller. I need to know how to use low-power mode. Do I leave the loop section of the sketch empty and set up an interrupt in the setup ...
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2answers
102 views

Efficient toggle switch

Is there a way to circuit a power efficient toggle switch controlled by a SINGLE button so that absolutely no current from the power source is drawn at it's OFF ...
0
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2answers
48 views

lowest loss for switch

Are there any other options for an extremely low loss switching circuit with extremely low switching frequency (about 4 times per day) and voltages from 0-3V with currents <2mA. Current ideas ...
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2answers
52 views

How to calculate voltage and current of a circuit with input / output MCU pins

I would like to know the method to calculate both voltage and current in a circuit that use MCU input / output pins In this example, how can we find the V / A of all resistances and Capacitors.. ...
0
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1answer
40 views

How to compute the maximum power I can get from an optical fiber?

I'm thinking of a project which requires powering a device with an optical fiber, but I don't know how to compute the maximum amount of power it can supply at the end. These are the parameters I ...
0
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1answer
37 views

Low RPM, Low Power, Low Torque Motor (to be solar powered)

I am trying to build a small contraption/artwork to be mounted on a wall indoors. Ideally it will solely solar powered from a small solar panel (10cmx10cm). It needs to spin slowly anywhere between ...
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0answers
13 views

Current 'buffer' for low power hall sensor

For a low power device I'm currently working on, I need some sort of current buffer. I'm planning on powering my device with a 4-20mA current loop, which leaves around 3.5mA of current I could use. I ...
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1answer
44 views

Energy Harvesting Primary VDD and Battery Backup VDD power for MCU

Currently I am in the design process of circuitry for my energy harvesting circuit. I am using the CC1110F32 MCU from TI. I am using the Development kit boards that they created for this project. The ...
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2answers
86 views

Very low power voltage regulator - diode?

I'm developing a very very low power system, and it has some components that need 3.3V. These components are actually spec'd to operate anywhere between ~1.8V and 3.7V, so theres some wiggle room ...
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1answer
45 views

Battery Protection IC: How to ensure that even under-voltage batteries are allowed to be charged?

As I understand, the battery protection circuit isolates the battery from the battery connector if it detects undervoltage condition. If this happens, how can the system ever charge the battery and ...
2
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2answers
152 views

Eliminate standby leakage current of output capacitor in a DC/DC converter charging a battery

I am using a DC/DC converter to charge a battery. The output current of the converter is about 6 Ampere at 41 Volts. I'm trying to eliminate the standby leakage current of the output capacitors in ...
6
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4answers
237 views

Minimum energy required for LED blink to be visible

I have a 5V schematic with 15n capacitor and I wondering if I will be able to blink an LED, powered from this capacitor. My calculations is that the capacitor will have about 0.2 uJ of energy. This I ...
0
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1answer
33 views

Using super-cutoff to reduce Direct Source to Drain Tunnelling

I was wondering if anyone had any insight on how useful it would be to reduce direct source to drain tunnelling by applying negative gate bias voltages on sub-10nm FinFETs. Has anyone looked at this ...
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1answer
60 views

Problems when loading an Ultrasonic transducer (reflected power)

I have a very simple setup that is giving me problems I cannot understand: Apparently, the reflected power is the same as the power generated by the amplifier (both measured by the amplifier, ...
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1answer
86 views

Long lived LED indicator

I want to have an extremely long-lived (at least one year) blinking LED with a single battery, like one 9V. Think like the battery indicator light in a smoke detector. The LED doesn't matter to me. ...
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2answers
103 views

Strange behavior of USART in PIC16LF18313

I am using this 8-bit, 8-pin mcu for asynchronous EUSART. Sometimes when I power it up, it gives me correct characters (e.g. I send 'w', it returns 'w'), but sometimes when I power it up, it returns ...
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2answers
50 views

How do I limit the current supplied to a DC motor?

I am designing a robot and my motors are taking up too much current when the robot runs into a wall or has the motors forcefully stopped. How do I limit the amount of current I give the motors?
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1answer
109 views

Detecting open circuit, very low power

We need low power consumption (1nA - 1uA) while the circuit is closed, and then wake the microcontroller when the circuit is opened. A the moment the design includes a custom metal switch which will ...
0
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1answer
36 views

Convert low voltage accelerometer to Wake ATTiny Open Source Binary Watch, activate on wrist motion

I'm working on building a binary watch similar to njeer's binary watch featured on hackaday I am planning on using a cr2032 3.0V 190mAh battery. So in order for this to run for any length of time ...
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3answers
137 views

LTSpice power supply simulation: what is wrong with it?

I have simulated the LM723 based regulator circuit in LTSpice And after running it I got 16A currents (blue/green) on diodes in rectifier. The max current I supposed to get here was 3.3A. Please ...
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1answer
37 views

Dealing with different voltage needs on a battery driven low-power board

I'm going to design a small wireless sensor box for a weather station project. This involves: A sensor running at 3.0-3.6V (1mA) A MCU, running at 3.0-5.5V A 433MHz transmitter which takes about ...
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0answers
92 views

Crowbar overvoltage protection: help needed

I have found an active "yetanotherovervoltage" protection circuit here, and it looks like: The questions are: What is the advantage of using this circuit or crowbar protection? What is the purpose ...
0
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1answer
49 views

How to claculate LM-723 regulator circuit headroom above the intended output voltage

I need to calculate the transformer VA for bipolar regulator circuit using LM723 so I need the voltage drop or may be a headroom for LM723 under load. The data sheet is silent about it. Is there ...
0
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3answers
161 views

Ultra low power 555 timer circuit

I am trying to design a circuit involving an LMC555 CMOS timer operating as a monostable multivibrator. Essentially, I want a momentary switch to turn on a set of LEDs for ~20 seconds and then turn ...
3
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2answers
80 views

How to modify a voltage regulator to make it very low quiescent current

We have built a hand held RF remote controller, powered by two CR2016 batteries in order to supply 6V. We used a microcontroller in the circuit, which runs under 3.3V. That's why, we used a voltage ...
0
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1answer
39 views

suggestions for solar charging battery-operated device

My battery-powered wireless device draws about 50mA @ 5V. I’m thinking of powering this off a 12V 7Ah SLA battery that is topped up with a small solar panel (12V, maybe 500mA or so). 12V to 5V will ...
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3answers
103 views

Looking for right component in my simple diagram

I am not electical engineer therefore stumbled upon this simple issue. In need to activate a 120VAC 1HP motor from sprinkler timer that has 4 individual channels providing 24VAC up to 400mA voltage ...
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1answer
44 views

LNK304P unexpected output voltage

I trying to understand what problem with next scheme. I have a power supply which should provide +12V but in my case it's only about 5v in output (checked on 1-2-7-8 and Gnd pins). I have tried to ...
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2answers
60 views

How to understand dynamic range of op amp from TI's book

I am reading TI's op amps for everyone. I am very confused about its description about dynamic range as follows I have some questions about it, Since it is the maximum output voltage the op amp ...
4
votes
1answer
112 views

Are Lithium Thionyl Chloride Battery usable in my vibrating environment? Are they safe?

I have to power a circuit subject to constant vibrations (10-15 Hz with an amplitude of ca 10 millimiters) with a battery and I was thinking of a Lithium Thionyl Chloride Battery. The circuit has to ...
1
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1answer
43 views

Latching battery switch triggered by interrupts

I've got an accelerometer with a couple interrupt pins and I've figured out how to get it to fire its interrupts on any change in acceleration or lack thereof for a given duration. What I want to do ...
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3answers
290 views

Charging a 12V car battery from a stream [closed]

EDIT: Thanks to everybody for replies and comments, which have been most useful. It seems that the hydro side of the equation would be challenging to implement, given the issues with sufficient head, ...
0
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0answers
21 views

Black body heat to current conversion

I have learnt about Seebeck effect and peltier effect in college physics, but it was more of theory than hands on numbers and practicals. Now is there a commercial or DIY module that can produce ...
5
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5answers
1k views

Measuring temperature with ±0.01°C accuracy

What is the most accurate way to measure temperature to ±0.01 °C? I have looked into using a Wheatstone bridge (with a minipot for minor calibrations) and an RTD for its precision and range. I ...
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1answer
51 views

Battery SoC measurement

I am designing an instrument powered by two series AA NiMH, NiCd, or alkaline batteries, I need to display remaining battery capacity on it, so I was wondering what the best way to do it is. I ...
2
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2answers
83 views

555 timer circuit power consumption

My goal is to have an LED flash (rather than stay on all of the time) in order to conserve battery life. So, I learned how to modify a 555 timer circuit so that the LED flashes for about 0.1Hz and ...
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2answers
92 views

Energy harvesting from a current transformer [closed]

Looking into developing a mobile GSM/3G/SMS current monitoring widget which measures and powers the circuitry from a current transformer(s). One of the major hurdles is gathering enough power to ...
0
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1answer
80 views

GPS Almanac versus Sky Search

The total almanac data is transmitted in 25 navigation messages. Each navigation message takes at least 30 seconds to transmit. So, receiving the almanac data from the satellites takes at least 12.5 ...