The process of removing energy from a store, such as a capacitor or battery. Stores may be parasitic, resulting in rapid spontaneous accidental discharge, as in a static shock.

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46 views

Li-ion battery maximum discharge current testing

I been playing a lot with Li-ion batteries (NCR18650Bs to be exact) and I have a question regarding how to test their maximum capabilities and generate my own conclusions. If you take a look at this ...
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1answer
71 views

What happens when discharging coin cell battery too much?

BACKGROUND: I'm working on a project where we use the nRF51 Bluetooth low energy chip, and our first prototype boards just arrived. So I've made some power measurements trying to calculate the ...
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1answer
49 views

Discharging capacitor through potentiometer in ADSR circuit

I'm trying to build a circuit for generating ADSR envelopes for use in an ananlog synthesizer, and a part of the circuit acting in a way I can't understand. Here is the part of the circuit that is ...
2
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1answer
64 views

Capacitor rise/fall time varying with supply voltage

While testing the capacitor voltage fall times for my board at 3 different voltage levels I see that for 6V the fall time is higher than for 18V. I checked the same on a breadboard with a capacitor ...
2
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0answers
70 views

Would this Li+ flashlight circuit be considered safe?

I recently got an inexpensive (~$4 USD) Li+ 18650-powered flashlight from banggood.com, one of my favorite sources for inexpensive Chinese electronics to tear down and hack for fun :) I wanted to ...
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1answer
111 views

What is the fastest way to drain all the charges of battery?

I need to build battery draining circuit which must finish off battery's charges as fast as possible. I've designed one, but not sure is it optimal one or not? I decided to connect single R to battery ...
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3answers
65 views

Capacitors discharging

I am a beginner at electronics so excuse my rather simplistic question. I would like to know regarding capacitors, if a capacitor is connected in a series circuit (as shown below but with a dc supply)...
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2answers
150 views

Alkaline AA discharge curve at just a few mA (to replace a CR2032)?

I bought a pack of tealights each powered by a single CR2032 (flickering LED; builtin timer turns it on every evening for 5 h). My wife loves them, but after just a fortnight each tealight's CR2032 ...
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0answers
51 views

Dicharge a Photoflash Capacitor in a coil

I am trying to do the coin tosser according to this pdf (result here) So the circuit is supposed to be this one: simulate this circuit – Schematic created using CircuitLab However when ...
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1answer
1k views

Capacitor discharging theory vs experiment doesnt match

I am trying to discharge my 1F capacitor over a 47 ohm resistance which i connected in parallel with the capacitor . İ have calculated the time it would take to discharge from 5V to 4V as 10.55 ...
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1answer
42 views

Transient response to rectangular impulse of a cascode common source amplifier

There is a cascode amplifier seen on the picture below. A rectangular pulse with amplitude of 10 mV is sent to the input. Due to large negative amplification gain of the cascode amplifier, output ...
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1answer
45 views

How can I measure the charge of a pulse imposed on a signal?

simulate this circuit – Schematic created using CircuitLab Hello All, So my question is regarding how I can determine the charge of the square voltage source. For example, I need to build a ...
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1answer
66 views

charging and discharging car battery [closed]

Apologies upfront if this is inane... I cannot find a succinct and exact answer to my question though! I have a constant water flow source in my garden - it fluctuates but with a little damming or ...
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1answer
61 views

Discharge Characteristics of Lithium Ion Battery

I am doing a simple experiment to analyse the discharge characteristics of a Lithium Ion battery to see how long it takes to discharge. I have a 12V 4000mAh battery. Once charged, using a voltmeter I ...
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2answers
28 views

Question about Static charges & dissipation

I have been practicing ESD safety procedures in my workplace. We typically use grounded ESD Wrist Straps and ESD mats. If I correctly understand the static charges stay put until they come in contact ...
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2answers
59 views

Get Li-Ion battery capacity from discharge time (constant load)

I would like to ask if there is some easy enough way to calculate Li-Ion battery capacity if I measure the discharge time with constant load (not constant current!). I have made a "discharger" using ...
1
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1answer
85 views

How calculate inductor discharge time through LED?

UPDATE Overnight I realized I'd been sleeping as I read part of the textbook I've been using or at least didn't quite fully grasp the purpose of inductor volt-second balance. I added the results of ...
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1answer
51 views

250Voltage discharging turnoff circuit

I'm reconditioning my hybrid battery. To do so requires multiple complete discharges which I do not have time to be around for. To avoid damaging my battery I've been attampting to design a circuit ...
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1answer
121 views

Charging and discharging of capacitors

I simulated this circuit in TINA-TI. However I could not understand the output waveform for the negative half of the cycle. Waveform: Green- Voltage across C2 (10 u cap) Brown- Voltage across C1 (1 ...
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1answer
97 views

Discharge / Bleeder resistors

I need to size and build a bleeder resistor network or could be as simple as two bleed resistors....im not sure but I have an application where a we have a step up transformer from 120VAC single phase ...
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1answer
135 views

active bleeder circuit for capacitor discharge

I have a circuit with a large capacitor, a solenoid and an N-channel FET fed by a 60VDC supply. When I trigger the FET the capacitor discharge activates the solenoid. This all works as expected (...
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2answers
155 views

Newbie question - sawtooth signal generation - capacitor discharge via bjt

I'm trying to realize a sawtooth wave generator. The circuit is composed by an op-amp integrator which creates the ramp. Then the integrator output is chained to a comparator with a fixed threshold, ...
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1answer
65 views

Help me understand capacitor discharging

Made this question in physics stack, but maybe I'll get a better answer here. If we apply loop rule while charging the circuit we get: $$\varepsilon -iR-\frac{q}{C}=0$$ The way I understand, we ...
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3answers
353 views

Area under voltage vs time discharge curve

Will the area under a voltage vs. time graph of a battery discharge curve (with a constant current load) give the amp-hour capacity rating of the battery? Thank you.
3
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2answers
71 views

Will it be fine to consume 0.0058 mA from a LiPo cell after its lowest discharge voltage of 3V has been reached?

I intend to connect a 240mAh 1S 3.7v 25C LiPo Battery with a 5V Step-Up Regulator to the Arduino pro mini v5 VCC pin bypassing the linear voltage regulator. But the battery datasheet says "Never ...
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1answer
52 views

Old 9v battery - Strange Behavior

The battery in my garage door remote finally quit. Before replacing it, I measured the voltage with a digital multimeter and was surprised to find it reading 9.70v, quite a bit higher than the ...
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2answers
115 views

discharge power rail with MOSFET

I need to discharge a power rail from 3.8V to 0V within 200ms. The control signal is active low (i.e. start discharging when control becomes low). I think the easiest implementation probably is to ...
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1answer
51 views

Formulas for Specific Capacitance Measures [closed]

I am designing a charging and discharging capacitor circuit for my power harvester. What I am looking for is the time it charges and discharges respectively. When I lookev over wikia and google. ...
2
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1answer
91 views

How to keep capacitor from discharging in/through regulator

I'm currently working on a project where I need the MCU to be able to keep running for at least a few seconds after the power have been interrupted (in case of power outage for example). So I choosed ...
2
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3answers
126 views

How can I quickly and safely make defunct electronics safe and free of charged capacitors?

I am planning a movie set which will contain old circuit boards from TVs, VCR's and other old electronics. The plan is to go to several Goodwill stores and buy up all of the TV's and such that they ...
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1answer
93 views

Can I connect two rechargable LI batteries of different specs in parallel?

More specifically, can I combine a high-discharge battery with a high-capacity battery if I want periodic high discharges combined with the higher capacity? For example, if I wanted to pair a high-...
0
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1answer
52 views

Circuit Design for Managed Draining of NiMH Cells

One of my pet peeves is the prevalence of devices powered by odd numbers of standard batteries (AA, AAA). Since I try to avoid using disposable cells and all of the chargers that I've so far owned ...
0
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1answer
150 views

Charging and discharging of a capacitor experiment

I set up an RC circuit and connected it with a signal generator. In the lab instructions, I was told to apply a "square wave signal" in order to see the transient response of the circuit in the ...
2
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3answers
280 views

Difference between battery and capacitor?

Can capacitor acts like power supply, in which situations? How related are charge/discharge time of battery and capacitor? Why battery has longer discharge time compared to capacitor? Why we cannot ...
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3answers
253 views

How do I safely discharge this capacitor with broken wire?

My electric lawn mower won't start, upon inspection some wires got loose and damaged by the motor. It's a 20µF 500V capacitor. Normally I would try to short the pins with a screwdriver, but as you ...
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1answer
84 views

Is it possible to calculate capacity of a battery using a resistor

Is it possible to measure the capacity of a battery if the discharge curve of the battery utilizes a resistor as the load? For example, if a 100 ohm resistor is connected to a battery and then the ...
0
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1answer
70 views

How to make a voltage vs amp-hour discharge curve

This is in regard with another question of mine, how do you make a discharge curve with the y-axis of voltage and x-axis of amp - hour?
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1answer
97 views

How to make a discharge curve

I am trying to make a discharge curve for one of my batteries that I have. All I know about it is that it is a 1.5V battery. Now if I have to make a discharge curve for it, how would I make one and ...
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2answers
196 views

Mixing same brand batteries with similar voltage

Just about everyone has heard of the problem with mixing new and old batteries, but is it safe to mix various old batteries with each other, regarded that they are the same model and brands, and read ...
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2answers
118 views

Calculating the discharge of Ultra Capacitors

Say I have two 500F ultra capacitors, connected in parallel, charged at 15V. These are the capacitors BMOD0500 P016 B01. Then say I connect the capacitors (via an inverter) to a 230V light bulb that ...
1
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0answers
58 views

one-sided saturation with op-amp and RC high pass filter

I am working with a photodetecting circuit built as follow: When I drive an LED ON and OFF, I get the following waveforms: Blue indicates that the LED is turned on when a voltage is high and ...
3
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1answer
105 views

Why capacitors lose charge over time? How to minimize it?

Capacitors lose charge over time, even when they are disconnected. Why does it happen? Is there a way to keep the charge longer, like for years. If you cover the plates with better insulator, will ...
-1
votes
3answers
339 views

Electricity needed to maintain power for camera [closed]

I am not an electrical engineer by any means and do not even know the terms I should use to ask this question but basically I am trying to determine which solar panel I can use to power my camera. ...
4
votes
2answers
145 views

Quasi-peak detector

This is the circuit of a quasi-peak detector: simulate this circuit – Schematic created using CircuitLab where \$ V_{\text{sig}}\$ is the input signal. When the diode is open-circuited, ...
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2answers
104 views

How does fluorescent lamp produce audible sound when blinking?

A fluorescent lamp will often blink near end of its life. Each time it blinks it likely produces a clearly audible sound which is hard to describe but it's something in between a water dip falling ...
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2answers
2k views

Are sealed lead-acid batteries safe to use indoors?

I have a small, 12V sealed lead-acid battery. I know regular lead-acid batteries can be dangerous to use or charge indoors, due to the fumes they release and the potential for acid to leak out or ...
3
votes
1answer
199 views

Questions on this high frequency sawtooth generator

So I found this very basic sawtooth generator: http://www.radiolocman.com/shem/schematics.html?di=143990 I have a few questions about it: I understand that when the capacitor C_T charges fully to ...
1
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1answer
48 views

What are possible alternatives for a depletion PMOS

I need a fast reacting way of discharging a capacitor and I figure a simple depletion PMOS is what I need. The time at which the gate has to have a voltage to keep the depletion PMOS closed is not ...
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2answers
674 views

Estimate minimum discharge voltage in a laptop battery

The objective is to determine the best 18650 cells to replace the ones in my laptop battery. To do that, I need to know the minimum voltage the battery controller accepts before ordering the OS to ...
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1answer
112 views

What is the effect of pulsed discharge on watt hour (Wh) efficiency of lead-acid batteries?

When discharging a (lead-acid) battery you see a voltage increase (volts rise) as soon as the discharge is paused. source: http://uu.diva-portal.org/smash/get/diva2:461718/FULLTEXT01 In the quest ...