# Questions tagged [power-electronics]

Refers to the conversion of electric power by using solid state components such as semiconductors. Can also generally apply to the field of electrical engineering which works with power electronics.

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88 views

### Using a push pull type solenoid to launch a ping pong

For are final project in physics we are launching ping pong balls at specific targets. I wanted to make something similar to an air soft gun for this project, by that I mean I want to to use air ...
69 views

### how rubber keypad works [closed]

Press on the keyboard, how does he connect the circuit of this key? Two thin films, coated with conductive rubber circuit, with a thin film in the middle, with holes, used to isolate two thin films ...
107 views

### Need help to newbie to understand MIL-STD-461 [closed]

why only 10khz-10Mhz is used for CE102 test ? why not other frequency range is used for CE102 test ?
227 views

### How to make safe power supply? [closed]

I have a product which required 24 volt supply. I had experienced many times my product has been given more than 24 volt supply and system gone bad. Is there any way to privant the damage caused by ...
296 views

### to keep power as constant either voltage or current changes [closed]

ohm's law states that voltage and current are proportional to each other. but my doubt is that "to keep power as constant either voltage or current changes" here the voltage and current are inversely ...
318 views

### Can conductors store charge? [closed]

Why are conductors not used to store charge? How does clouds hold such large volume of charges?
78 views

### Diode equation.Needs understanding [duplicate]

Kindly explain this equation for me.I do not understand what it means and from where this equation comes out?it's a diode equation $$r^{\prime}_d = \dfrac{26\mathrm{mV}}{I_D} + r_B$$
86 views

### Why the led isn't glowing? [closed]

Why doesn't the led glow? I am trying to glow my LED For Making Project Of Detectore but it doesn't glow. When i connect this circuit with my full project that time LED Wasn't Glowing After I ...
60 views

### Is there any use of reducing ripple in boost converter greatly below the tolerance level?In what applications is extremely high stability important? [closed]

suppose i have a circuit which already has low ripple.Will decreasing the ripple by a little more be of any use?If so,in what applications is this useful?Please explain with an example.Thank you!
107 views

### regulator ac to dc with

I am studying for my EE exam ,I understand the general working of the circuit but there is some details about it I have to know. this regulator supply 24 volt with puissance nominale 200watt. it ...
109 views

### Buck-Boost converter without low side switch

Please look at the buck -boost converter below. It is 2 outputs, one buck and one boost output. Would the circuit work as describe in the picture? In what condition the circuit will it work? If so how ...
218 views

### Is there any device which allows the flow of electricity after certain wattage? [closed]

Is there any device which allows the electricity to flow only after a certain wattage and not below it ? Something reverse of circuit breaker
2k views

### voltage change inn diodes [closed]

voltage relation diodes of rectification process related to electronics
393 views

### What is the working of Class A , ClassB and Class C amplifiers? [closed]

Please describe conceptually the working of Class A, Class B and Class C amplifiers.Having problems understanding them.
2k views

### What are power amplifiers?

What is a power amplifier? What is the difference between power amplifier and simple amplifier? As both are amplifying the signal what's the difference?
83 views

### calculating Power

I wanted to ask, if I have a electrical component with a power rating of let's say 5W does this mean it would dissapate 10W after 2 hours and 15 W after 3 hours?? or is it correct to say it dissapates ...
59 views

### If a source voltage has a phase equal to 0, can we consider it as a DC voltage?

Example: $v(t)= 5 cos(0t)$ and $s(t)=5 sin(0t)$ Are $v(t)$ or $s(t)$ DC or AC as their phases are null?
459 views

### If Voltage has tolerance 110V-220V, Why Electricity Broke? [closed]

First, my knowledge is, if an electronics (computer) needs 220 Volt. And there is drop voltage when we use it (let say 200V). Current will go high, and the component will be hot. And it (component) ...
69 views

### I want to boost 0.45V and 0.6mA to 0.7V and 3mA suggest me a circuit which can do that [closed]

I'm doing a project that basically transfer the power from a laser and light up an led using it. The power output we are getting from the laser is at most 0.45V and 0.6mA (we used photodiode to ...
271 views

### Programming undervoltage lockout in Boost(Step up) converter

Requirement is to convert 3 V (1.5 x 2 alkaline batteries) dc voltage to 5 V Dc voltage. I know battery voltage decrease with the use and i am required to set a threshold voltage so that if battery ...
1k views

### What happens when a AC current is applied to a PN junction? [closed]

What would happen if a AC current is applied to a PN junction? Is the input current a sine wave?
1k views

### Difference between power amplifier and voltage amplifier! [closed]

What are the major difference between power amplifier and voltage amplifier?
89 views

### how to make 4-20 mA signal to replace pressure transmitter with adjustment of variable resistor? [closed]

I want to replace -B1 (Pressure Transmitter in figure and install a circuit of variable resistor control to get 4- 20 mA signal
1k views

### What is the tolerance level of SMD resistors?

As in normal ceramic and carbon film resistors we can calculate by color codes but nothing mention over the smd components so how to get it? As nothing is ideal so I believe there will be some ...
351 views

### I have a circuit which draws a current of 500mA, and works at 5V. I require it to draw max of 200uA from the supply

I have a smoke detector circuit which draws a current of 500mA, and works at 5V. I require it to draw not more than 200uA from the supply. Will a simple current limiter circuit solve this problem? ...
2k views

### What could have caused a short circuit on a power adapter? [closed]

So, I've got a device without a power cable. I've found and used a old one I've found lying around. After getting the device to work, it started to smoke... What could have gone wrong? Here are some ...
896 views

### Application of SCR & TRIAC in electronics Field [closed]

What are the main applications of an SCR in analog electronics as well as in digital electronics? I only heard them in my books I have seen only usage of transistors, MOSFETs, FET's during the ...
414 views

### how to increase or decrease common emitter amplifier Av gain [closed]

common emitter amplifier (BJT), With components, transistor hfe 300, AC signal 10 milli volts, 1KHz, Vcc 12, RB 1 = 15K, RB 2 = 2.2K, RC = 10, RE = 830 ohms, (the Av gain for this circuit is 12,) how ...
110 views

### How much energy could we harvest from a 0.1V source (gedankenexperiment) [closed]

For the sake of a thought experiment, suppose two 10-metre balls appear magically somewhere on land. In the middle of the Sahara desert for example. The balls are the terminals of a perfect voltage ...
775 views

### Arduino Uno short circuits [closed]

When I connect the 5V of my Arduino to the GND why does it get short circuited ? And why does the Arduino Uno doesn't really get short circuited and the Arduino Nano does get short circuited ?
81 views

### What is this? Could this help aid in creating an electromagnetic field [closed]

out of a Carvin Dcm1500 amp, and I was wondering if you guys could maybe tell me what it is, what it does, and what the connectors do? Thank you!
95 views

### Can this circuit work without being grounded?

Have a look on this Seeedstudio IR Flame sensor module. The PCB image suggests that the components are not connected to the ground. Then how could the Sensor Module work ? Is the PCB circuit ...
1k views

### power consumption of electronic component [closed]

I have a question when i look into any chipset manufacturer datasheet they mention the power consumed by that chipset or any electronic component is lets say some 60mA or some XmA now is this power ...
140 views

### How to create a shocker device safely, that would electrocute a user with a low charge [closed]

===================================================== As a disclaimer, I'm a novice when it comes to electrical engineering, I have a background in programming in comparison. I'm looking for ...
125 views

### I supplied 220 volts to 120 volts FM radio receiver? [closed]

I mistakenly plug an FM radio receiver of 120 volts directly to my home electricity : 220 volts. it worked for almost 5 seconds and then something inside got fried and it stop working. Do you have ...
129 views

### Is it possible to use a wattmeter to switch a power outlet? [closed]

Can I use a wattmeter to switch a power outlet? My idea is to connect the wattmeter with a relay and when there is current the relay turns on like the thing in a master-slave power outlet. Is this ...
77 views

### Efficient electronics components [closed]

Imagine budget is not an issue and you are asked to design the most efficient circuit. With efficient, I mean that the power used to perform the functions is used solely for that and is not dissipated ...
204 views

### What will be the range of this mobile jammer circuit? [closed]

The description on a web suggest that this circuit will give signals till 100 meters. I am very close to the airport so this is not acceptable. The input is only 3V so I feel the website is wrong.
53 views

### Any suggestions on how to make a current limiting circuitry? [closed]

I am a student of Electrical Engineering and I am currently working on a biomedical device which stimulates a human arm through functional electrical stimulation technique. Now for instance, if short ...
104 views

### explain the working of this circuit [closed]

I'm basically trying to understand how this Dc to Dc step-up converter work. please help me.[![dc-dc step-up voltage converter 1v-9v][2]][2] I need to design a DC DC step up converter using bjts. ...
133 views

### Are these resistors in series?

We had this question as a part of a small signal analysis question on the Final. This circuit I drew below is the DC analysis which is the first step pre-AC analysis which will have a totally ...
99 views

### Future of Electronics [on hold]

Actually I am studying electronic engineering and I have to make a choice of specialization. Until now what I have learnt about circuits can be divided in two cathegories: on one hand everything ...
147 views

### plugging battery against the power supply [closed]

This may come across as a rather nonsensical question however I think it is worth asking simply to understand what happened. I plugged in an electric car battery directly to a wall socket, almost ...
159 views

### I need 120 volts DC (yes, direct current) at 20 amperes [closed]

I want direct current at mains voltage--120 volts DC up to 20 amperes. I don't want the DC output voltage to exceed 120VDC. I'll be rectifying from 120VAC single-phase mains. I want efficient non-...
210 views

### what voltage required to replace schottky diode to zener diode [closed]

I have very basic question. what value of zener voltage I need to replace schottky diode with Vrrm=40V?
117 views

### Explain the equation [closed]

Explain the following equation... $$r^{\prime}_d = \dfrac{26\mathrm{mV}}{I_D} + r_B$$ Explain from where and how this equation comes out . Also elaborate the terms used in above mentioned equation....
125 views

### How to convert 5v 45 amp dc to high frequency current? [closed]

My source is a desktop computer power supply, It's output is 5 v ,45 amps dc. I want it to be converted to 20khz or more frequency ac current with same or less volt and same current. Edit:- I am ...