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Questions tagged [lifetime]

The tag has no usage guidance.

1
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4answers
96 views

Are circuits damaged by a constant 55°C environment?

I know that sun like temperatures kill electronics, but what about 55°C if it's constant? I have a small commercial web camera that is officially rated 0°C to 70°C. It has no jelly capacitors. I ...
0
votes
0answers
22 views

Battery capacity for optimal life

I am planning to construct a small electromobile for which I will use a 3kW electric motor which will be powered by li-ion batteries. It would be sufficient for the vehicle to run for about 1 hour ...
0
votes
1answer
68 views

Keep spare LED bulbs or increase dimming? [closed]

I have a luminary with 12 light points for standard E14 bulbs and a LED dimmer in the wall. Using Calex bulbs, I only need 6 bulbs, which I run most of the time at 80% light output (measured with the ...
8
votes
2answers
2k views

What causes loss of power over lifetime of a magnetron?

The power of a magnetron declines over time\$^1\$. While not noticable for most consumer applications (A 2000-hour lifetime would last over 20 years if the device is used only 15 minutes a day), this ...
0
votes
1answer
144 views

Life cycle of power MOSFET as a switch in SMPS circuits

In many SMPS application (BOOST converter in particular), power MOSFET is used as a switch and it is driven by a PWM/IC at a frequency in a range of hundreds kHz (f = 200kHz for instance). This means ...
1
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2answers
257 views

How to measure Alkaline battery lifetime/capacity in practice LED circuit?

I have a LED light uses three 1.5V ALKALINE batteries in series. However, the capacity of the battery is not marking. When I put a multimeter in series with these three batteries and turn on the LED, ...
0
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0answers
110 views

Filtering Rectified AC Signal: What should be the optimal filter order?

I need to filter rectified 220V/50Hz AC signal. The load current will be 10A at maximum. I want the peak-to-peak ripple signal to be 15% of the average signal (DC) level at most. In order to increase ...
0
votes
1answer
58 views

Actual life expectancy of COTS power supplies

Can anyone shed some light on what the actual expected lifetime of a commercial off-the-shelf power supply would be? I've seen the unbelievable MTBF numbers given in power supply datasheets, and ...
1
vote
1answer
59 views

unique lead acid application question

Can anyone tell me what the non-cycling lifetime of a lead acid cell(s) is, under some kind of float or trickle charge? Specifically, I need: 300W for 2 seconds either at +24V with no conversion, ...
0
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0answers
25 views

Power supply lifecycle when turning OFF/ON

I have a laptop power supply: https://www.ebay.com/itm/NEW-100-Genuine-120W-Power-Supply-for-ASUS-G60v-Republic-of-Gamers-Gaming-Laptop-/162584726401?hash=item25dace0b81:g:tMQAAOSwNSxVA9Fc I ...
0
votes
2answers
53 views

How long will the batteries last when hooked up to this light?

The light being used is here: https://www.amazon.com/Germicidal-254nm-U-shape-150mm-Purification/dp/B01CV2W12E Lamp Current: 5.0mA Wattage: 8 watts It will be hooked up to 2 AA batteries in ...
1
vote
2answers
64 views

Why current is constant during storage phase in reverse recovery experiment?

This is a simple schematic of reverse recovery experiment. As you can see, there is a constant current phase in the curve known as storage phase. My question is, why current is constant during ...
3
votes
1answer
373 views

Why do tantalum capacitor datasheets only quote endurance at their max temperature? How does it change at room temperature?

I'm on my first large board design, and it's only begun to dawn on me how infuriating capacitors can be to design with. Exhibit A: I need 100uF for a simple circuit to keep my FPGA on for 1ms after ...
2
votes
1answer
394 views

Configuring BLDC motor for low-speed application

Given: I need to the simulate sinusoidal forces on a wind-tunnel model using a bench-top setup. I've designed a rig where I spin a load at high speeds to generate centrifugal centripetal forces, and ...
3
votes
2answers
165 views

Could modern electronic chips (e.g. ARM and Intel processors) operate for millennia at sufficiently low temperatures and clock speeds?

More broadly, what the practical maximum a modern silicon chip could be expected to last (assuming it operates at some temperature above 77K, and it has stable power)? For example, I expect diffusion ...
0
votes
1answer
69 views

Any side effects when substituting bigger capacity battery in place of smaller capacity?

I have a car key fob whose batteries recently died. The coin slot says it accepts two cr2025 coin cell batteries. But I was thinking, since a majority of coin cell batteries run at 3v, I should be ...
0
votes
1answer
265 views

Reverse recovery method for carrier lifetime measurement

I have used reverse recovery method for measurement of carrier lifetime. I have used a simple setup consisting of a function generator, a resistance and DUT (design under test). In a conventional ...
1
vote
2answers
207 views

Why do old batteries take the same amount of time to charge

I have a laptop that has a battery that is reaching the end of its life. Despite the fact that it is only running at around 35% of the capacity, it still takes the same amount of time to charge. Does ...
7
votes
3answers
2k views

Life Expectancy of Power Supplies

There are many articles on the internet about life expectancy of switching power supplies, but most of them have discussed about the situations that the PSU is at near full load. I'm designing an ...
1
vote
2answers
733 views

Will rapidly changing cycling an LED through different colors reduce lifespan?

I just purchased an RGB LED mechanical keyboard, where each key has its own color. I was playing with the settings, and found one I like: each LED under each key rapidly cycles between colors. It ...
19
votes
1answer
2k views

How do LEDs slowly degrade in normal use?

As I understand it, an LED normally has a service life of perhaps 25 years with output that decays exponentially as a function of time and current. What causes the degradation? I'm guessing that ...
0
votes
1answer
312 views

Trimpot potentiometer rotational life Vs load life

I'm dealing with an application which makes use of an adjustable linear voltage regulator (LT3080). A trimpot potentiometer is used in place of the set resistance Rset to regulate the output voltage. ...
0
votes
1answer
306 views

How to increase the lifespan of an Arduino. [closed]

I have made a device with arduino MEGA with 50+ one wire sensors, 4-6 shift registers, SIM800l module, ethernet module, wifi module, RTC, SD card module, OLED, buttons, thermal printer, LM2596 buck ...
65
votes
6answers
9k views

What happened to electrolytic capacitors in the 21st century?

We can sometimes see decades-old capacitors (such as ones made in the USSR) still working. They are bigger and heavier, but durable and not desiccating. Modern aluminium capacitors serve for about 11 ...
0
votes
1answer
49 views

What makes compact florescent lamp wear out so fast?

I notice that a compact florescent lamps (CFL) wear out faster than its lifetime. My personal experiment was on 15 watt / 220 V / 50-60 Hz / 690 Lumen spiral lamp. Its rated lifetime is 8000 hours (...
0
votes
1answer
95 views

Life of a heated coil using a 9V battery [duplicate]

I've been looking into heating a nickel chromium wire with a 9V battery for one of my projects. Can anyone feed me an equation for calculating the life of the battery? I'm sure it will include gage of ...
2
votes
1answer
50 views

Wireless Sensor Network Lifetime Estimation

I am attempting to replicate a calculation for estimating the lifetime of a wireless sensor network based on the measured energy draw of each operation. These values are given in a table which I have ...
1
vote
2answers
3k views

Battery lifetime calculation approach for Arduino + GPS/GSM

I want an Arduino Nano to send its GPS coordinates via SMS. I'm going to use the GSM/GPS module SIM908. My problem has to do with how many SMS will I be able to send before the battery dies. I've ...
23
votes
4answers
2k views

Does (and when how) the lifetime of a LED depend on the PWM frequency

Let's assume two options for driving a standard LED at its rated current. PWM set to 50% duty cycle at 10 kHz PWM set to 50% duty cycle at 50 kHz Technically both LEDs would produce the ...
9
votes
3answers
454 views

How are very long component lifetime claims ascertained/evaluated?

Its a common specification for household devices such as lightbulbs. However, I can't figure out how you'd truly evaluate/prove such a claim without running the device for the specified amount of time....
-1
votes
3answers
325 views

Life expectancy of electronic parts in old electronic keyboard [closed]

I have an old Roland A80 keyboard, that was probably built in the late 80's or early 90's. And right now it works well. But I'm wondering, how long can I expect the electronic parts to keep working? ...
0
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2answers
1k views

What is the lifespan of ultrasonic transducers like the ones used in hobby projects?

I see ultrasonic transducers used in many Arduino and similar applications for proximity sensing. I wonder what is the lifespan of such devices (Chinese cheap models, not Chinese more expensive ones) ...
1
vote
1answer
83 views

Life of a Component at half Load [closed]

Good Afternoon A IC which has Max current rating is 10A , But in my Design i will always use it at 5A current only. Will my component life will be double by doing this or not??
-3
votes
2answers
945 views

Shelf Life of Super Capacitor

Why shelf life (storage of caps in non-operational condition at constant temperature) of super capacitor is less as compared to operational life? How to determine the shelf life of supercapacitor at ...
1
vote
1answer
111 views

Is there any wearout mechanism for a relay simply from current flowing?

How will the wear of a relay be affected if the current through the relay is brought to zero before the relay is operated? I'm thinking about having a solid state relay in series with 3 mechanical ...
20
votes
4answers
3k views

Do conductors age under reasonable electric load?

Construction steels are prone to fatigue failure - they get structurally weaker when exposed to repeated mechanical stress. Is there any similar process for conductors which makes them less usable ...
3
votes
1answer
946 views

Smoke detectors replacing - why? Lifetime of components?

I often see that smoke detectors "should be replaced" every 5, 10 or 20 years. Like on this website for example: http://modernsurvivalblog.com/health/did-you-know-smoke-detectors-expire/ The U.S. ...
8
votes
6answers
4k views

Leaving the heater of a vacuum tube on all the time vs cycling it

I want to build a tube amplifier that will be on for ~7 hours/day. I was wondering whether the life expectancy of the tube would be higher if I left the heater on all the time and just turned the ...
22
votes
4answers
3k views

Do components have an un-used lifespan?

Lets say for example, that I had a box full of transistors, resistors, capacitors, diodes, leds, this and that, and left it in a cool, average environment for lets say... 50 years. Do these ...
9
votes
3answers
4k views

How deep should we discharge lithium batteries to maximise their lifetime?

Recently I posted an answer mentioning the very classic "lithium batteries like partial discharges, so design your system for limited depth of discharge". But then I wondered: with partial discharges, ...
2
votes
1answer
872 views

Surface Mount vs Through Hole Aluminium Electrolytic Capacitors?

What are the differences between SMD and TH Aluminium Electrolytic Capacitors? Why are TH variants available with such greater lifetimes? (For example, Digi-key has SMD aluminium caps up to 10k hours, ...
0
votes
1answer
321 views

Effects of C Rating on Battery Life

A polymer lithium ion battery is rated at 3.7v, 6600mAh and a maximum discharge current is specified at 3.3A. I take it this means the battery can be discharged at 3.3A and last for two hours since 6....
6
votes
3answers
2k views

Determining End-Of-Life for electronic components

What is the best way to determine the end-of-life time-line for ICs other than contacting the manufacturer directly? Is there a central registry or service where I can subscribe and get EOL ...
2
votes
4answers
2k views

Is it possible to power AVR micro project with just one coin cell battery?

My current project setup is: ATmega328P micro with 32 LEDS driven by 4 8-bit shift registers. System without LEDs draws 20mA of current continuously. With all LEDs lit at the same time, it draws ...
5
votes
1answer
642 views

Weakest link in lifetime of electronic circuits

I'm working on a product, a single-board computer with an expected lifetime of 10-15 years, and I'm trying to identify the correct components to focus on for this. So far electrolytic capacitors ...
6
votes
2answers
9k views

minority carrier life time? Why is it important for devices' switching speed. Why not majority carriers?

I am trying to get my head around why would a silicon engineer care about the minority life time carrier and how does the minority carrier affect the switching speed of PN junction. Why is it so much ...
8
votes
4answers
9k views

Is my phone battery better / more capacitative than my laptop battery?

When we go out and look for phones, the first thing I do I always look at the battery capacity, usually 2000 mAh, 3000, up to 10000 mAh for a (external?) battery. Looking at laptop batteries, they ...
1
vote
1answer
26k views

Can batteries be charged and discharged at the same time? And do they wear down faster when doing so? [duplicate]

Imagine batteries connected to a charge controller and a load at the same time. When the load asks for power, and the charge controller delivers power, there are three possible situations: P_in > ...
4
votes
2answers
4k views

Arduino Lifetime

I have made an RPM datalogger using Arduino that stores RPM-data on an SD card. I have intefaced LCD with arduino (used 6 digital pins of arduino), an RTC (DS3231,used 2 analog pins), SD card slot(4 ...
4
votes
2answers
5k views

What are the effects of AC vs DC for an Incandescent bulb life?

What are the effects of AC versus DC on incandescent bulb life? Provided the same amount of power is being delivered to the bulb.