Questions tagged [low-power]

Low-power refers to electronics that are designed to use less power than their common counterparts. This is often a requirement because of limited available power, as in battery operated devices, or in cases with limited cooling capabilities, as in notebooks.

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Designing a self-power current range detector

I need to design a current range detector i.e. a module with an AC current as input and a digital output. When the current is within range (i.e. between 0.1A AC to 2.5A AC), the output should be a ...
Saksham Jain's user avatar
0 votes
2 answers
122 views

Over voltage and backflow protection

I'm drawing up a MCU based device for my bike to control light etc. The power comes from the dynamo, and at higher speeds it will produce a lot more voltage than the circuit can handle, so protection ...
MiNiMe's user avatar
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31 views

How to interpret input common-mode voltage vs output voltage in INA823 Datasheet

First, a similar question was asked before Understanding common mode vs output voltage graph for instrumentation amps, however, I failed to understand it with regards to my use case and need more ...
tronhawk's user avatar
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31 views

SPDT switch for low power application

In my battery powered mouse design, for the main switches I was initially using the traditional SPDT switch circuit, but after realizing how bad it is for low power applications I moved to a low-power ...
StefanoN's user avatar
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2 answers
69 views

High power consumption in STOP2 mode

I'am using the STOP2 mode in stm32wb55 microcontroller. I followed the stm example code and got the desired behavior with a power consumption of 10 µA. However for my application I need to leave one ...
Faiz-983654's user avatar
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2 answers
117 views

Excessive power consumption on "AND" gate

I have an issue with an IC "and" gate (SN74AUP1G08) that has a power consumption that is way higher than what is indicated in the datasheet. Indeed, the datasheet indicates that the maximum ...
Log Dix's user avatar
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1 answer
54 views

How to design the power supply for my project?

I just started my journey into electronics and have successfully built a 2 digit 7 segment counter (using IC 40110 and a pushbutton) on a breadboard. I used the 3.3V and ground pins of Arduino to ...
Firstname Lastname's user avatar
0 votes
2 answers
56 views

Low power: how to power a small dc motor from a logic low

I have made a circuit to power a small motor with solar cells that I have salvaged from garden led lights. The goal of the circuit is to power the motor everytime the sun has moved a little bit. My ...
Log Dix's user avatar
0 votes
1 answer
50 views

Common ground on both input and output of the buck modules

I'm trying to power an Arduino and an ESP32 at the same time, and I made a charging circuit using a MT3608 and a MP1584EN as step up and step down for the Arduino and the ESP32 respectively. As you ...
Jazz Handy's user avatar
1 vote
2 answers
114 views

Voltage divider with megaohm resistors for low current consumption

I'm designing a circuit that uses the power MUX TPS2116. The design is normally powered by a 4.2 V battery, but as soon as the battery is removed it should be powered by a secondary power source, a 3 ...
user2251965's user avatar
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1 answer
84 views

Detecting presence of mains voltage using Microcontroller, low power solution

I'm currently designing a 'smart' light switch, controllable from Microcontroller and physical switch. I am looking for a low power solution to convert signal so that the Microcontroller can detect if ...
pedpx2's user avatar
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2 votes
2 answers
59 views

Battery protection circuit for very small Li-ion pouch cell

I have a project where I'm planning to use a unprotected Li-ion pouch cell with a capacity of 10 mAh. I will be providing my own external protection circuitry. All of the overcharge/overdischarge ...
John M's user avatar
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1 vote
2 answers
128 views

NRF52 - unexpected high power in idle mode

I am trying to program a low-powered Bluetooth Low-Energy sensor using an nrf52810 microcontroller. I am trying to minimize power consumption when the sensor is idle. I have created a minimum code ...
ItsAmy's user avatar
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2 answers
41 views

Multiple transmitters sending simple binary switch value, one receiver, high likelihood of signal clashes

Having searched the forum I haven't found something similar to my use case, so thought I would post it, and my initial thinking for feedback, suggestions. Scenario I want to build an RF game show like ...
bentwonk's user avatar
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31 views

Forced DCM for Buck-Boost converter [duplicate]

For a SiC MOSFET-based boost converter which operates in synchronous boost converter mode, under low load condition (less than 10% of load) i.e. when the load is less than 500 W for a 5 kW converter, ...
Power_Electronics's user avatar
3 votes
1 answer
99 views

How do you create small devices that can remain "dead" for a very long time without damaging the battery?

I'm working on a product that uses a very small 20mAh lipo battery. The device only needs to operate for 8 hours, and that's not a problem. However, I expect that customers may run the device until it ...
Drew's user avatar
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1 vote
1 answer
58 views

Simple, low-power circuit for five IR LEDs that light up in sequence and stay lit

I have 5 LEDs in an array, which I need that when I press the power button, they turn on in sequence: the first one turns on and stays on, then the 2nd led turns on and the 2nd one stays on and so on ...
Claudio's user avatar
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0 answers
63 views

Calculating the lowest value MOSFET pull-down resistor

I am using the AO3415 to do high-side switching. My aim is to reduce power consumption as this low-power device should run for ages on a single battery. System quiescent current is less than 5 μA. (...
UnknownDagger's user avatar
0 votes
3 answers
80 views

Power control of IC chips with N-Channel MOSFET

I'm building a battery-based wireless weather monitor for hobby project. for longer battery life, I want to control the power of each subsystem separately. Let's take a NRF24 modem for example: ...
Yukihyo's user avatar
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0 votes
1 answer
64 views

STM32 development board design

I am making a board to learn STM32 with a future Li-Po battery powered project in mind. The aim of the project is to have a device that wakes up a couple of times a day on its own and can also be ...
shklj's user avatar
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1 vote
1 answer
126 views

ESP32 power efficient battery monitoring

I'm trying to implement a simple battery monitoring circuit for an ESP32 that gets completely shut down and then powered on periodically. I don't want to drain the battery and/or backpower the ESP32 ...
kr4sh's user avatar
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1 answer
54 views

Implement a 5 Layered CNN for inference on Arduino

I'm working on a problem where we convert a 5 layered CNN which is capable of predicting the possibility of an epilepsy episode (yes or no), into a Spiking Neural Network (SNN), making it useful for ...
satan 29's user avatar
  • 189
4 votes
4 answers
342 views

What is the best way to switch power to a logic level device with minimal or no voltage loss

I'm a new product designer trying to learn electrical engineering on my own. I have a circuit that I need to control the power to a set of periphery circuit segments including a display, SD card, and ...
Michael.G's user avatar
1 vote
3 answers
129 views

Detecting LED state of a device using optocouplers

I am trying to convert a dumb ice maker to a smart device with the following control board (5V LED.) My aim is to check the state of these LEDs using an optocoupler isolation board (4-5 channel 3.3V ...
iBot's user avatar
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0 votes
0 answers
56 views

Powering a microcontroller during sleep periods

In general, what is the best practice for powering a battery-powered uC during its sleep periods? I have a uC driven system that does a bunch of stuff for perhaps 10% of the time, and spends the rest ...
Paul Blase's user avatar
1 vote
1 answer
34 views

Power sharing with Li-po charger

I'm working on a Li-po charger with power sharing. I had a look at this post which shows a circuit like this: I may well be misunderstanding, but I can't see how the MOSFET Q1 is ever switched on. It ...
Charlie Skilbeck's user avatar
1 vote
2 answers
71 views

How to automate passive powering?

I have a low-power fuel cell which I am connecting to a capacitor to charge a capacitor to power a small motor. The cell itself does not have enough power to power the motor. After the capacitor is ...
Anwar Elhadad's user avatar
0 votes
2 answers
69 views

Building a DC circuit that produces output voltage from 1 to 10 in 1V increments [closed]

I have been trying to design a DC circuit that can produce a range of output voltage from 1 to 10 in 1 voltage increments with just (non-inverting) operational amplifiers, switches, resistors, and ...
user avatar
1 vote
2 answers
44 views

How to put MCP3008 into sleep mode

I am using an MCP3008 ADC connected to a Seeed Studio Xiao nRF52840. I am using the adafruit library #include <Adafruit_MCP3008.h> It operates as expected, ...
MattG's user avatar
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5 votes
4 answers
692 views

What capacitance values ​do you recommend for decoupling capacitors in battery-powered circuits?

Basically I have two questions related to decoupling capacitors: In the circuit of the image you can see a simplified representation of a decoupling capacitor in parallel with a power supply, but how ...
WalterPH's user avatar
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0 votes
0 answers
65 views

Why there is no current flowing through the boost converter to the DC motor?

I am trying to make a boost converter to boost a low voltage from a solar cell to power a low power DC motor. I want to power a DC motor using a single solar cell, that can only provide about 0.5-0.6 ...
Azka Maula's user avatar
11 votes
7 answers
4k views

What is the maximum voltage of an AAA battery?

I am designing a circuit that will be powered by 3 AAA batteries. I know that the nominal voltage of an AAA battery is 1.5 V, but I also read on the internet that the open-circuit voltage could be ...
John's user avatar
  • 175
2 votes
1 answer
122 views

Simple low-power LED display

I am trying to build a LED project and I am looking for a little help to get started. I’m aiming to build a small, low-power LED display of 6 - 10 low-power white LEDs. It will have 2 small coin cell ...
Warranty_void's user avatar
0 votes
1 answer
73 views

Will adding magnets increase the current from a treadmill DC- wind-powered generator?

Using average 8-10 mph speeds, my treadmill 6:1 pulley ratio, I'm getting 12-14 Volts output, but I'm disappointed in my anemic, 0.5 - 1.7 ampere, output. This results in barely more than a battery &...
Richard M.'s user avatar
0 votes
0 answers
50 views

MAX17260 after shutdown state

I am using the MAX17260 and during shpping set it to shutdown state the battery is always connected to the MAX17260. do we need to update the MAX17260 register after exiting from shut down mode?
Avi Keret's user avatar
9 votes
3 answers
713 views

Does lower voltage mean lower power consumption?

I am designing the architecture of an embedded system, and I have to decide between setting the power rail at 3 V or at 1.8 V. The system will have an MCU, memory and a few sensor ICs. Depending on ...
Nikola2232's user avatar
0 votes
1 answer
108 views

How to choose a "good" 3.3 V LDO and FET for low power applications?

I am trying to design my first low-power PCB using an ESP32 to switch a 12 V 1.2 A LED Strip. I purchased this module that charges a Lithium battery using a solar panel here. Hence that is where the 5 ...
JoeyB's user avatar
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0 votes
1 answer
162 views

Handling large current peaks on CR2032 battery

I’m designing a nRF52832 SOC based device and I came across this issue with energy buffering and battery voltage drop. I am using a CR2032 battery, nRF52832 SoC and a VCNL3040 proximity sensor. This ...
Letho's user avatar
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0 votes
2 answers
223 views

ESP32 power latch circuit react on low and high (reed switch)

I am currently building a door sensor with an ESP32 and a reed switch. My code is working with the deep sleep functionalities of the ESP32. With its help I can detect a falling/rising edge and wake ...
EBMare's user avatar
  • 1
2 votes
2 answers
68 views

Cheapest way to "isolate" sub-circuits for partial power-down?

My design is extremely power-consumption sensitive, and I need to power parts of design down (using load switches) when they are not in use. I need a way to prevent myself from unintentionally back-...
foxtrot's user avatar
  • 167
1 vote
0 answers
112 views

P-channel MOSFET + op-amp ideal diode

I'm replicating the ideal diode circuit from Crutschow. I'm using the op-amp flavor in order to get a very low quiescent current. The P-channel MOSFET will be a NTMFS002P03P8ZT1G. My questions are : ...
VoltsAndNuts's user avatar
0 votes
0 answers
58 views

How do I get a 1.5 V reference voltage from a 3 V coin cell battery? [duplicate]

My goal is to build an amplification circuit powered by a 3 V coin cell battery that uses an instrumentation amplifier to read a differential voltage. The instrumentation amplifier chip has a ...
dinoswords's user avatar
0 votes
0 answers
57 views

Design generator stator for maximum power at low speeds

I am building a very small fluid turbine & AC generator. It is a radial flux permanent magnet machine. It's about a few cm sphere/cylinder. I'm wondering what tips you have for optimizing the ...
Alexander Ohm's user avatar
1 vote
2 answers
101 views

Latching relay for MCU self power-off or high side MOSFET switch?

I am designing an ATtiny project that needs to operate for a specified amount of time on request, then power itself down completely. Although ATtiny MCUs are remarkable in terms of sleep mode power ...
rodv92's user avatar
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9 votes
1 answer
613 views

Why is buck-boost efficiency not specified for ultra light loads (μA)?

When browsing for buck-boost converters I've looked at many datasheets and I've made an observation that I'd like to question. I have a low-power application and energy consumption is one of my ...
Alexander Ohm's user avatar
1 vote
0 answers
40 views

Understanding average Iq of buck boost converter (skipping and switching modes)

I'm trying to pick a buck boost converter for a low power, small battery, long life device. The datasheets specify different supply currents for different modes and I just can't wrap my head around ...
Alexander Ohm's user avatar
4 votes
0 answers
87 views

Any way to have MSP430 wake from sleep and immediately start executing the next instruction after the sleep, avoiding calling into the ISR?

I am executing a simple state machine that steps based on a pin change and sleeps between steps. A significant amount of time is spent in the overhead overhead of calling the ISR on each pin change, ...
bigjosh's user avatar
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2 votes
1 answer
92 views

Comparing two variable voltages with minimal power consumption

I'm trying to design a circuit that compares two variable voltages V1 and V2 and fires an interrupt to an MCU when V2 is greater than V1 and at the same time V1 must be at least 4.4 V. The range of V1 ...
Aalsubhi's user avatar
1 vote
0 answers
60 views

Multiple voltage diode protection

I'm attempting to build a circuit that can be powered from either a external power connection (+12V in the diagram), or via USB (VBUS). I realized that I also want to be able to connect the USB for ...
Fenrir's user avatar
  • 11
1 vote
1 answer
66 views

Poll for button input while sleeping - PIC microcontroller

I'm working on a wall control project that runs on a battery. Therefore, I want the system to be in sleep mode while there is no user input. I'm using a PIC18F45Q43 which has 3 external interrupts, ...
mrs15's user avatar
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