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# 220 Transformer

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110 220 transformer , relay 220 , 220 inverter , 12v 220
89 Threads found on edaboard.com: 220 Transformer

## HELP : degital PSU transformer values needed

Hi all i got my hands on an old degital power supply unit , the model is : koocu 1501t it is 0-15 volt , with variable voltage and amperage 98918 but unfortunately , it was not working,i opened it , it has a big transformer with one pair of wires as primary (220 v) and 3 pairs as secondery ( green - black and yellow) ,

## need schematic diagram of 12v and 10 ampere power supply or charger transformerless

Your heading mentioned transformer-less , but your question does not. Which is it? If it's transformer-less and you want to go from mains voltage(110,220,240 AC) then take crutschow's advice. If you are prepared to use a transformer , it's easier :0)

## Simple AC mains regulater with overvoltage and overcurrent protection

Would somebody be kind to tell me about an AC Mains(220 or 120VAC) regulating circuit capable of delivering up to 600W with overvoltage and overcurrent protection? Thanks in advance...Simplicity is critical For overcurrent protection use fuse. Overvoltage / Undervoltage protection (voltage stabiliz

## 5v Dc Regulated Power Supply - Transformer Selection

You have not stated what current you are after. When you have decided this, select you regulator IC. sort of like 7805 for low current (.1 A) or lm317 for high currents. A good input voltage for 5V out, would be 9V, so you need a transformer, 230/220 V -> 6V at the current you need times about 1.2 . The capacitor should be 1000MF per amp of cur

## stepping down 300v ac

"I want to stepdown 300Vac 50hz to 5v(peak)", 5V peak is 3.5V RMS. 220 to 12 V is not a good place to start from. Ignoring any transformer problems, you would get 300/250 X 12 = 14.4 V when you need 3.5, so you will have 4 times as many volts as required!!! If the 3.5V is going to feed a FIXED load (er, LED perhaps?) then a simple series resistor

## drive fet with sinusoidal voltage

hey everybody , is it possible to drive a FET with a sinusoidale voltage of 220V , and if possible i want it without using a rectifier thank you in advance

## how can I 220 v ac to 14or 25 dc without transformer?

how can I 220 v ac to 14or 25 dc without transformer? I'm very new to this area. there is many chip dc-dc and 25 to 0-6 volt down converter. but why there is no 220 v to 25 volt chip?? I don't understand... Should I must use transformer?? I want very tiny converter. I want not using transformer (...)

## Impedance in transformers

P.U Impedance=( actual impedance in ohm * base MVA) / ((base voltage, KV)^2 ) P.U Impedance=(100*50)/(220^2) =5000/48400 =0.1 :wink:

## Electronic circuit to convert 220 to 12 for turn on 3 led

You must use transformer, reactive capacitance (capacitor like a resistor), smps, etc... ( ) ( ) Caution, Electric Shock Risk!!!

## 220 V AC to 5V AC planer PCB transformer design? Output current is around 10mA

I want to design a 220V 50Hz AC to 5V AC current is around 5mA~10mA PCB planner transformer. The efficiency is just more than 10%, that is enough. Here is the question ? 1 Can I design it? Did anyone design this? Because the winding N is around 45:1. I think it will be not easy, but my current need is very small. 2 How Big it will b

## Making a 12-220 inverter, HV part with TL494

I'm learning how to make an inverter, and need help figuring out what is normal and what is not, and fixing the latter. The basic layout is - make 320V from 12V, using a high frequency, small size ferrite transformer, rectify the 320V, turn them into AC with a full bridge. It splits nicely into two parts, and i want to debug them separately.

## Boosting 1-2 volts to 220?

Use transformer. But on transformer primar you need lots of current. Core 30mm x 25mm 56W, Sec 220V at 200mA EI type of iron core. Primar 12 turns of thicker wire, secundar 1397 turns 0,31mm.

## Auto-transformer design

The calculation of an auto - transformer is different to a normal transformer. Not necessarily, but you need to understand the operation of an auto transformer. A 220/110V 1000VA auto transformer is essentially a normal 110/110V 500VA transformer.

## Help Transformer AC connection

i want to connect 220 or 110v in primary but i don't have any clue which of the wires i will connect if i want to use 220v or

## 75 volt charger electronic cuircit

i need electronic cuircit to charge 75v battery automatically by using thyristor , i have 220/75 transformer

## suggestion for transformer wattage

remember conservation of energy? Well, for an ideal transformer, the power into the primary = power out of the secondary. Since you want 220*5=1100 watts out, you need 1110 watts in, or 1100/12=92 Amps. But since you can't buy an ideal transformer, you're going to need to put more than 92 amps in. You need to know the efficiency of the (...)

The inductances of the primary and secondary should be different if the ratio is different: L1=L2*(N1/N2)^2 . For example, let's say you have a 1H secondary inductance and the ratio is 12/220, then the primary would be approximately: L1 = 1H*(12/220)^2 ~ 3mH Also, the coupling coefficient can be safely chosen as 0.99, but set it to 1 for a better u

## Pic Microcontroller Based Switch Mode 12 Volt to 220 Volt inverter

Dear Experts I want to design a pic micrcontroller based switch mode(Ferrite Core transformer) Based 12 Volt DC to 220 Volt Ac 50 Hz Inverter. today i have downloaded a circuit from this forum but i dont understand. can any one help me to understand the circuit as well as required Microncontroller Code and also ferrite core transformer (...)

## 220 AC 50Hz to 100V DC supply design..

You don't say what the expected current is. Using a 220 -> 80V transformer and a linear regulator will get you any level of ripple you require. Frank

## Whats the primary & secondary resistance of this step down transformer ?

Whats the primary & secondary resistance of this step down transformer ? 1) Vp = 380 Vac 2) Vs = 220 Vac 3) Ip = 15.78 Amps 4) Is = 27.27 Amps 5) P = 6 KVA Rp = ? Rs = ? thanXXX