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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50 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 ...
9
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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
30 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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0answers
16 views

cable sections: peak current table

I need to build a coil for a capacitor discharge coil magnetizer The discharge reaches ~2kA 200us peaks , but I wasn't able to find a peak current table. Is there a table/formula for such case?
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24 views

(ESD) Spark Length for air discharge - difference between 'broad air route & narrow air route'

I'm trying to measure spark length of electrostatic discharge.(with ESD Gun) I've checked the length is quite different A and B. A : ESD GUN ~ air ~ edge of metal plate with GND. B : ESD GUN ~ ...
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1answer
41 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 ...
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1answer
56 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 ...
0
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1answer
57 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
50 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 ...
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1answer
79 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
95 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
68 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 ...
0
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1answer
87 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
121 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
61 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
230 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.
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2answers
68 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
47 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
106 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
48 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
83 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 ...
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3answers
123 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
84 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 ...
0
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1answer
51 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 ...
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1answer
143 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 ...
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0answers
175 views

Battery testing depth of discharge vs cycles

I am currently investigating the relationship between the depth of discharge of a lithium battery, the number of cycles and capacity lost. I know from literature that the lower to DOD (%) the more ...
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3answers
267 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 ...
6
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3answers
227 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
83 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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0answers
114 views

How to find the cut off and maximum voltage rating of a battery

How can I find the cut off voltage of my battery (for discharge) and a maximum voltage (for charging)? Is there an equation to do this, or are these two calculate by making a discharge curve? Thank ...
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?
0
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1answer
86 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
173 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
113 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
52 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
101 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 ...
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3answers
266 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
133 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 ...
2
votes
1answer
174 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 ...
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1answer
46 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
538 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
105 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 ...
0
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1answer
85 views

Makeshift way to drain a battery?

I have a 3.8V mobile-phone battery that I need to discharge. However I don't have any electrical components (say led) with me. What is a crude way to do this using household items?
0
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2answers
81 views

capacitor discharge direction

This is probably a dumb question, but I am sort of confused. What direction does a cap discharge when a system is turned off? For example, decoupling caps that go to ground. When I shut a system down, ...
2
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2answers
498 views

A few questions about basic capacitor concepts

So say you a typical setup like in this diagram. How does current flow while the capacitors charge? To elaborate, what is the mechanic that makes capacitors mimic the functionality of a wire ...
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1answer
82 views

Maintaining DC voltage with more batteries

I have a circuit which i am powering with two 1.5V AA batteries that dies at 2.6V volt as the battery discharges. Reading around, i realized that even though there is energy in the batteries, my ...