"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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Different Means of Short Distance Wireless Communication

We have been struggling to find a means other than RF communication to wirelessly signal an event between devices placed 60 feet apart and not more than that.The signal can be raised by any of the ...
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3answers
115 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 ...
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2answers
66 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 ...
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31 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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98 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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37 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
44 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 ...
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0answers
65 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 ...
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1answer
36 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
256 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, ...
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0answers
18 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 ...
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5answers
920 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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48 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 ...
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2answers
77 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
77 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 ...
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1answer
73 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 ...
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2answers
84 views

Can super amplified line-level audio (e.g. 60Hz sine) signal be used as an AC power source?

However inefficient (or bizarre) this may sound— can a line-level 60Hz sine (originating from a sound card, oscillator, etc) amplified by a heavy duty 1000W+ RMS monoblock be used as a substitute for ...
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4answers
159 views

Will this battery pack for an LED strip need a resister?

I want to use a small battery pack to power a strip of LEDs from Radioshack. They didn't have the power supply but list the requirements as 12VDC/1.5A. I know 8 AA batteries will provide 12 volts ...
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1answer
78 views

Unbalanced differential pair in NE5234

I had a question in mind. I was reading "Design and Analysis of Integrated Circuits" by Gray and Meyer... In the edition 5 there is an analysis of a Low power OpAmp NE5234... In the second stage of ...
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1answer
36 views

Operating multiple low power devices from 1 adapter [duplicate]

I have 3 WRT54G routers (12V), 1 voip gw (9V), 1 cable modem (9v) and a gbit ethernet switch (12v) which are all operating from their own adapters. I planning to build a low power (probably 12V UPS) ...
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1answer
77 views

Harvesting Energy from an Electromagnetic Generator

I have designed a simple circuit that harvests energy that is generated from an electromagnetic generator. I would like to know tips I could use to improve efficiency and minimize the losses I may ...
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2answers
110 views

Is this a viable Voltage Regulator design?

I'd like to power a Raspberry Pi 1.0 Model B and a USB HDD enclosure from a 12V DC, 2.5A power supply. The USB HDD enclosure accepts 12V directly, but doesn't state how much power it consumes. The HDD ...
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0answers
45 views

MFRC522 Interrupt Handling

I am working on a project that reads RFID tags/cards by using MSP430 and MFRC522 module. Module communicates with MSP430 via SPI. It detects cards and reads serial number with polling properly. ...
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20 views

Low Current Consuption on a Voltage Inverter

I'm working with a uC and a Bluetooth Module. I need the lowest current consumption in this project because it is intended to be a mobile device. Thus, I'm using sleep modes on the uC. Now, I've ...
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1answer
67 views

12V active-low on/off switch

I have a microcontroller that I want to install in my car. One wire coming from the car supplies +12V from the battery independent of whether the car is on or off. This works fine to power the ...
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2answers
101 views

Linear regulator with external switch

I need to obtain 5V stable week power supply from a 230VAC power line. I need this as cheap and as small as possible. Fortunately I don't need galvanic isolation and required current is as low as 1-2 ...
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47 views

How to communicate my location using very low power generated using my piezoelectric material?

I have been able to charge a super capacitor of 0.1f upto 3.5V by embedding it in my shoes using some piezoelectric stacks, and now I want to use the capacitor for some emergency condition. I want to ...
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67 views

Bluetooth low energy button press, minimal power consumption

I wish to have a button and light connected to a bluetooth low energy device, paired to an android app with simulated functionality. i.e: Physical button pressed => method is called on the phone ...
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1answer
44 views

ATmega48PA power consumption during EEPROM write

PLEASE, PLEASE! My question is about power consumption of the CPU during EEPROM write NOT about the power supply! PLEASE! Thank you! I have a device (ATmega48PA) powered through a 150k resistor ...
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1answer
94 views

How do digital watches use so little power (and how do I do that?) [duplicate]

The title of the question is pretty self-explanatory. I did a quick back-of-the-envelope calculation for my own digital calculator watch (the Casio CA-53W for those who are interested). The battery ...
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2answers
79 views

Low DC Current (~ 1.2 A) SPDT for Arduino

A little explanation first. I am working on an Arduino project where I want to measure photovoltaic power generation by measuring voltage and current of an array of 10 small PV modules at 5.5 V. ...
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4answers
893 views

Can I use multiple 18650 batteries in parallel with a standard MicroUSB 3.7V charger board?

There is this Bluetooth Audio Reciever/Amplifier board that I'm looking to get from ebay, and according to the diagram, there's a MicroUSB 3.7V lithium battery charger component in it. With my ...
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1answer
41 views

Energy consumption of a small TFT

I am looking to replace a 4.3 inch TFT (480*270 px - 400-500 mA @ 5V) by a more energy efficient one (other sizes welcome) to go with my raspberry pi driven handheld emulation console. What is the ...
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1answer
41 views

How to design Digital logic gate using TFET logic?

In my recent project, I need to design digital logic gates using TFET instead of CMOS logic. Can someone Suggest any simulator or procedure which support design using TFET logic?
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1answer
54 views

Total current drop when using leds in parallel [closed]

I'm making an led light for video shoot purpose. It's an array of 20, 5w led in parallel. The problem I'm encountering is, current drops when I'm connecting them in parallel. My power supply is ...
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41 views

Latch-up and ESD protection for power supply and RS-422

I am designing a power supply board that has a switching regulator and four LDOs. Now, I understand that layout details or practices will help reduce switching noise from corrupting the ground and so ...
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2answers
75 views

Atmega328 Clock Freq. via Divider vs. Power

I have a question that the power section in the Atmega328p datasheet does not seem to cover. I was planning on running my system at 1MHZ with a 2.8V VCC for a good trade off of power vs performance. ...
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1answer
66 views

Creating electricity from heat

I want to build an alarm for my soldering iron that goes off if it is hot for too long. Rather than rely on batteries I am wondering if it is possible to generate enough power from the heat of the ...
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1answer
94 views

Very low power shunt regulator for signal clipping

I'm designing a very-low-power, i.e. less than 5 uA device, that requires external inputs. These inputs need to be protected against over-voltage. The allowed range is about -0.1 V to 3.0 V. If ...
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56 views

12V input with 12V and 5V (USB) output?

So say that I have a 12V DC power supply like this and I need to power a 12V DC device (LCD controller board) and this USB port / 5V regulator. Is this all safe to wire in series (parallel in edits) ...
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1answer
118 views

Do SD cards operating at 1.8V save any power compared to 2.7 - 3.6V?

Excuse me if I'm repeating my previous question, but it wasn't getting any answers probably because it was too broad. So, let me narrow the question down to just UHS SD cards that can operate at 1.8V ...
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1answer
118 views

For variable voltage devices, namely SD cards, how much power do you save by using a lower voltage?

I'm designing a computer vision system and my 3 main components are microcontroller (VDD = [1.8V, 3.6V]) microSD card (4 bit mode, VDD = [2.7V, 3.6V] according to SD 2.0 standard) cheap cell phone ...
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1answer
90 views

How to power a lower-power circuit and an audio amplifier off the same source efficiently?

I want to create an audio amplifier that powers itself one when it detects audio coming in. I've found a low power IC that can signal when audio is present: NJM2072. I figure I could use that switch ...
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1answer
63 views

BJT vs Mosfet, switching variable current battery powered device

I have a device that runs on voltage between 3v and 3v3 and consumes current anywhere between 4mA and 50mA. The device is powered from a battery with a 3v3 regulator. I need to design a circuit that ...
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1answer
44 views

Wiring a light to activate via relay

I've got a computer program that monitors an audio signal. When the audio signal drops below a certain threshold it triggers an email to the appropriate person. This same program can either make a ...
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2answers
46 views

Low-power interrupt generator

My objective is to generate an interrupt on an Atmega328P processor every second or so, using substantially less average current consumption than the inbuilt watchdog timer. You can see from the ...
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2answers
162 views

Comparison of wireless communication technologies: bluetooth vs wifi [closed]

I would like to build a simple battery-powered board with temperature and humidity sensors. It should be able to be placed in different rooms of an appartment, and I want to be able to read the values ...
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1answer
42 views

Measuring impedance frequency response on Low Power Board

I have a low power board (2.1V DC). It runs a micro, some sensors, etc. I am interested in plotting out the impedance frequency response of the overall board so I can tell where the impedance dips. ...
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85 views

Leach circuit to power microcontroller

Like many, I'm trying to design small circuits to do things. One objective is a device to report home power use. Such a device is relatively easy. Powering such a device for the very long term is ...
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55 views

Controlling power via code?

I have a lithium battery connected to a 0.33 amp / 12V pump via a connector (which can be changed - this connector option is part of the question). Is it possible to control power to the pump via code ...