"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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3answers
148 views

Why filter through hardware?

I am trying to measure a signal with a voltage amplitude between 10-100 microvolts and a frequency between 7-30Hz. The guide I am following suggests filtering out 60Hz noise using a notch filter, as ...
0
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2answers
139 views

Low power battery backup

I am currently working on a low power battery backed data logger. An Intersil ICL7673 backup switch is used to switch between the battery and external power. Because the circuit draws more than 30mA I ...
2
votes
1answer
40 views

Efficient low current buck controller topology

In SMPS there are two sources of loss: parasitics, and the controller. Usually, the load consumes more power than the controller, and the parasitic losses dominate. I have the opposite situation. I ...
0
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2answers
63 views

Universal 3.3V & 5V power source for small device

I'm working on a hobby project which combines two modules that require 3.3V @ 130mA and 5V @ 100mA power sources. I want to make my device work at wide range of power sources - from single 3.7V ...
-1
votes
3answers
143 views

Replace AAA battery with a smaller battery?

I know it is possible to replace a AAA battery with a power source, and that it is possible to use AAA batteries as AA batteries (these are what I find when I google this question). My problem is ...
3
votes
1answer
53 views

Sensor supplied by MCU - sink or source what is most energy efficient?

I'm building a tiny system for fridge door monitoring. AVR (Attiny13A) is used which is connected to a linear hall sensor OH49E, the complete system is battery powered and I'm trying to minimize power ...
0
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2answers
34 views

Considerations for switch mode power supply with microcontroller and sensors [closed]

I'm fairly new to this forum and the entire field of electrical engineering. I have a microcontroller (Atmega328P) project that includes a current sensor and several radios (900Mhz-2.4ghz). It is ...
10
votes
3answers
1k views

Why does voltage not appear in the battery life calculation?

I have a PCB with a few radio modules on it. In its various states it currently uses anywhere between 100 µA and 100 mA. I can calculate how much time it spends in each of its states over a given year....
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0answers
57 views

What is more power efficient: GPRS or SMS for a GSM sim Arduino application?

I have a GSM shield for my Arduino and am wondering the most power efficient way to receive and send data from and to the cloud. The specific project I am looking to accomplish is starting my car ...
0
votes
1answer
42 views

operand isolation in RTL

I'm trying to build some low power circuits at the RTL level. How would I go about coding operand isolation so that the synthesis tool (ASIC/FPGA) recognizes it. Assuming the spec requires the output ...
1
vote
2answers
88 views

Low voltage drop transistor/mosfet switch - 3.3V 200mA

I need to make a switch. However p-n junction drop seems to be a problem for my use. Hence I am unable to use something like this: In this case, my load won't be getting exact 3.3V across it. ...
0
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1answer
145 views

Arduino and GSM Module running on Li-primary batteries for years

For one of our projects we need to run an Arduino board + GSM module (SIM800C for example) for many years on batteries without recharging. The Arduino should be in power down mode for 99,99% of the ...
1
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1answer
33 views

Solar cell charging and battery chemistry for low power 2.4-3V supply?

I've recently been looking into the possibility of using an amorphous silicon solar cell (like they have in calculators) to supplement my very low power BLE system's current consumption to extend the ...
0
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0answers
20 views

Building a battery powered flood sensor

I'm trying to design a device to trigger an email when water is detected on a sensor (i.e. a flood sensor for a laundry or similar). For the sensor, I'm considering a couple of electrodes/contacts ...
0
votes
2answers
61 views

Voltage reference for an OCXO

I have a no-name OCXO with pins marked by seller (VCC, GND, RF OUT, Vadj). I have checked its output frequency against rubidium oscillator using the following method: I connected them both to ...
0
votes
0answers
32 views

Dual power supply for the LMV324M

This smartplug reference from TI makes use of a LMV324M for the metrology bit, which is the low power version of the popular LM324. Its being powered from a +/-3.3V supply in the design however the ...
1
vote
0answers
91 views

Finding a diode with a low vDrop at low currents

simulate this circuit – Schematic created using CircuitLab So, I'm designing a circuit which has to work with current flowing in both directions through a resistor. I need to measure the ...
-1
votes
2answers
72 views

Rotary Encoder for Android GPIO

I'm not too sure if this is the place to ask but I'm not sure where else this question belongs. I'm trying to hook up a rotary encoder to an Android dev board's GPIO pins, although I'm having trouble ...
0
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0answers
49 views

Electronic circuit to power on module in intervals

I have a WeMos D1 R2 ESP8266 based board thats compatible/running Arduino libraries that consumes approx 1.7mA on it's deepsleep. A 9V battery of 600mAh wil last 14 days only using the power of ...
0
votes
1answer
20 views

lipo pack to 16vac inverter design

Im looking to drive a 16 vac solenoid from a battery pack. Specifically I want an electric door catch to function when mains are down. I want to do this with out with out using a commercial UPS. Im ...
0
votes
1answer
15 views

Lower Power Inductive Heating Circuit Design Questions

I'm trying to design a very low power (<=10W) inductive heating circuit that will heat the work material to 40-50degC. I've seen plenty of Royer Oscillator circuits online (see here: http://www....
0
votes
1answer
73 views

Power supply safety standards

I want to build radio/alarm clock that power itself from the wall. I live in Canada. What safety standards should I follow? And is it free to acquire the datasheet of these safety standards or does it ...
0
votes
2answers
73 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 ...
0
votes
1answer
46 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 ...
3
votes
3answers
107 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 ...
0
votes
4answers
89 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
votes
2answers
66 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 3-...
0
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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, ...
0
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0answers
34 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
60 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 ...
0
votes
1answer
52 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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votes
1answer
60 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
vote
1answer
63 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 ...
1
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2answers
109 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
53 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 ...
0
votes
2answers
70 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
votes
1answer
41 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 know:...
0
votes
1answer
48 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 ~...
1
vote
1answer
51 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 ...
1
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2answers
90 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 ...
0
votes
1answer
80 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 ...
3
votes
2answers
206 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
votes
4answers
260 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
votes
1answer
36 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 ...
1
vote
1answer
67 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, ...
1
vote
1answer
88 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. ...
0
votes
2answers
110 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 ...
0
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2answers
54 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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votes
1answer
114 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
votes
1answer
41 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 I'...