Showing posts with label electronic. Show all posts
Showing posts with label electronic. Show all posts

Saturday, 18 October 2014

How to make a 12v 5Amp transformerless or electronic power supply which is Switched Mode Power Supply (SMPS) based

How to make a 12v 5Amp transformerless or electronic power supply which is Switched Mode Power Supply(SMPS) based.

Making a 12v 5A Transormerless electronic power supply is really a complicated task and if we made it the resulting circuit will become a bulky circuit. Don't worry about it, Now we are going to solve it together.

In this post, We are going to take advantage of High frequency method over a small transformer or inducuctors coupled together over a ferrite core, This method also known as Flyback Converter type design. As we all know at High frequency, we can make a small transformer conduct even much higher current or power far above the rated...
specification without damaging it. So just use this property to exploit the small transformer to get high amperage from a little ferrite transformer. Simply switch mode power supply simply the property of inductor that it always opposes the rate of change of current flowing through. So simply by switching on and off the inductor will result in boosted output across the inductor with opposit polarity. The simplest switch mode power supply (smps) are boost converter circuit but it is not a isolated power supply from mains so today we are going to make a flyback converter power supply (smps based) to get a highly regulated output by using a beedback by optocoupler to tightly regulate output and is also isolated from the mains supply also for our 12 volt 5 ampere electronic supply which is switch mode power supply ( smps based) to be stable tightly regulated and isolated like we need .

Monday, 26 May 2014

Make a 5volt 8-100mAmp transformerless electronic power supply or cell phon battery charger at home

How to make 5volt 8 to 100mAmp transformerless electronic power supply or cell phon battery charger simple compact, efficient and cheap at home.

Almost all of our electronic products or projects, we need a compact cheap power supply for converting mains AC voltage to a regulated DC voltage. For making a power supply designing of each and every component is essential. Here I’m going to discuss the designing of  regulated 5V Power Supply.

To make a transformerless electronic power supply or Capacitor Power Supplies, we use a Voltage Dropping non polar Capacitor in series with the main line. An ordinary capacitor can not be used in these applications because Mains Spikes may create holes in dielectric of ordinary capacitors and the capacitor will fail to work or even may explodes. This may destroy the device connected to such power supply. Thus we use X Rated Capacitor with required voltage is used for this project. X Rated Capacitors rated for 250v, 400v, 600v AC and higher voltage levels are also available. Reactance of the voltage dropping capacitor should be greater than the load resistance to keep constant current through the load otherwise the current may drop when connected to different loads.

Thursday, 22 May 2014

make 30volt 1amp transformerless power supply circuit

How to make 30volt 1amp transformerless electronic power supply simple and sleak at home.

Today i am going to post an article about the 30watt power supply which id 30volt and 1Amp transformerless electronic power supply circuit for medium current application. This circuit is not only compact circuit but also cheap and compact circuit.This circuit an be made at home using easily available component at market.

Sunday, 4 May 2014

Simplest 5V Transformerless Power Supply Circuit

How to make Simplest Transformerless power supply for low current and low voltage application(5volt 150mAmp) using a IC-LR645

Some of the followers of this blog have requested to post a simple low current and low voltage i.e 5volt & 100mAmp. So today i am going to post an transformerless power supply which is not only easy to construct but also very cheap and small or compact electronic circuit. This electronic circuit can be used to for various purpose like charging small li-ion batteries e.t.c. In this circuit we are going to use IC-LR645 which can control any voltage between 24 and 270 V AC and produces DC voltages below 15 volts at the output, which becomes ideally suitable for operating condition.

The great thing about this circuit is that it does not include or incorporate any bulky transformer but it also dont uses high voltage polar capacitors here. So no worries about surge current and we don't need crowbar protection circuit here.

Friday, 2 May 2014

Ozone Air Water Sterilizer Circuit

How to make an Electronic Air  Water Food Sterlizer or Purifier circuit at home


Ozone is a pale blue colored gas having a pungent smell or order (alike chlorine) with the chemical formula of O3. In the atmosphere ozone is produced due to the presence of Oxygen and strong UV rays or electrical discharges during thunder storms or lightnings.

This phenomenon produce ozone basically by knocking down the dioxide molecules (O2) which is present plentifully in the atmosphere, resulting in the reaction O2 → 2O. Where O is free nascent oxygen.

Then the resultant free radicals generated during above phenomenon as 2O collide around with each other forming  the ozone gas O. This process continues as long as the source which is lightning arcs or UV rays is present.

Here in this circuit we are using the property that by nature Ozone is a very strong oxidant even stronger than dioxides. This property of ozone is helpful in killing germs, parasites and other microorganisms which may be regarded as pests and hence is used as sterilizer for disinfecting or sterilize or purify Air, Water or Food.

However, the strong oxidizing property of ozone could be also harmful for humans and animals and could cause respiratory disorders if inhaled for longer periods of time inside a non-ventilated premise.

Friday, 25 April 2014

Simple Light Dark Detector circuit using LDR

How to make very Simple Electronic Dark or Light detector circuit using LDR and Integrating a Relay in it for making it a  Automatic Switch.

Today we are going to learn how to make an eletronic dark or light detector circuit because this marvelous piece of gadget can be very useful if integrated with other devices as a switch. It means when a certain predefined intensity of light is reached our device is able to detect that condition and able to switch any device and can be very useful for saving energy and efforts. We can make a Automatic Lawn Light, Automatic Bulb or Tubelight, Automatic Car Head Light switch and many many useful circuit. It can be used in various ways if logically applied.

Thursday, 3 April 2014

How to make 0 to 12v Variable High Current Transformerless Electronic Power Supply or LED Driver or Electronic Dimmer which is Surge Free.

How to make a 0 to 12v Variable Transformerless Electronic Power Supply or LED Driver or Electronic Dimmer at home.

In this post i am going to explain how to make a Electronic Dimmer or Transformerless Electronic Power supply or LED driver which can vary it output from o to 12v or even higher. This circuit can be a useful gadget for electronic hobbyist to test various appliances having different voltage rating for them. This circuit have a protection against Surge current while switched ON by Crowbar Network attached to its output. This design ensures that high current value is availabe at all voltage levels . So without wasting time lets get started....

I have previously explained various power supply on my blog but today we are going to learn a little bit about how to protect surge current from the circuit. 

Previously i had explained about how to make a variable high current, high voltage from 0v to 300v using a Mosfet and transistor.

Today we will see how to use Thyrister or SCR (Silicon Controlled Rectifier) for making a variable voltage high current surge free transformerless electronic power supply or Led driver or Electronic Dimmer by using a Crowbar Network.

Now lets start making this circuit.

Components Required:

Resistance: 1 Mega ohm, 22 ohm, 5k preset or potentiometer.
Diodes: four IN4007 diodes, 24v/400mW zener.

Wednesday, 2 April 2014

How to make a 0-300V Variable Voltage, Current Transformerless Electronic Power Supply or Driver Circuit.

How to make a 0~300v Variable Voltage & Current Transformerless Electronic Power Supply or LED Driver or Electronic Dimmer.


In this post i am going to show how to make a variable transformerless electronic Power supply or Electronic Dimmer means this power supply can vary  both voltage as well as current. This circuit can be of great importance like checking different appliances (samll as well as big appliances) without worrying about buying their power supply which is diffrent for different appliances. It can be used on any device....

One day when i was testing a led strip on  Electrical Dimmer or Auto-transformer ( which actually is a bulky circuit), due to its bulkiness i start thinking why not develop a Transformerless Electronic dimmer for ease of use. So i come up with this circuit.

I made this circuit, short circuit proof. so enjoy making this marvel piece of Gadget.

Saturday, 22 March 2014

How to make Transformerless or Electronic Power Supply/Driver

How to Make Transformerless 12Volt 1 Ampere or 2 ampere or more amperage compact DC electronic Power Supply or Driver/Charger.


Today we are going to learn how to design and make the Cheapest and Smallest Transformerless electronic Power Supply or capacitive power supply 12v 1a or 2a according to our requirement. Actually there are many Power supplies available in the market but most of them are transformer/smps based and are very Big, Bulky, ugly, costly and have very complex circuitary to understand by a complete newbie.

So, lets get started to learn the design procedure so that we will be able to make the desired electronic power supply onward.

The biggest advantage of this explained circuit is that it is independent of input voltages fluctuations to a great extent

Here, we assume the input power source used here is 220V AC OR 110V AC 50~60Hz from home wall socket directly.


C1= 400V, 1395K Capacitor or (Connect three 400v, 475k caramic capacitor in parallel or three 2uf/400v caramic capacitor) (Note if the mains current is 220v AC 50-60Hz if mains is 110v AC then use 250v/1395k).

[The above circuit is Verified and Tested circuit by me and works great, so make it, save money & enjoy.]


In above circuit, R1 is actually doing nothing, but serve's the purpose of Bleeder Resistance, means it discharges the Charge stored in C1 gradually when the circuit is not in use( it may takes time between 1 to 15 sec according to its value and amount of charge stored).

This power supply is best suited for Capacitive loads like charging the battery, LED Drivers or any capacitive load...

So, By by reading the below post you guys will be able to design and make the power supply of any current rating and voltage rating according to your requirement. So please be focused and attentive to understand the technical specifications.

[Instruction: Above project deals with mains AC current & not isolated from AC mains, So be careful and work always under the guidance of any elder if you are a complete newbie. Please always remember to keep your one hand in pocket whenever working with any live circuit so that in case the current wont pass through your heart just for safety].


In my next post i m going to post a circuit of 12V 5 ampere transformer less electronic switch mode power supply(or SMPS based) or Driver.

Posts Recommended:

  1. Make 30volt 1amp transformerless power supply circuit
  2. Make a 12v 5Amp SMPS transformerless electronic power supply
  3. Make a 12V 10Amp, 20Amp, 30Amp, 40Amp variable transformerless electronic SMPS power supply
  4. Simple 12 v 1 amp SMPS power supply, battery charger, LED driver circuit
  5. Make 5V 2A Power supply by IC 78S05 simple circuit
  6. Make 5V 1Amp Cell Phone battery Charger Circuit from 220/110v
  7. Make 48V Transformerless Electronic Automatic Battery Pack Charger Circuit
  8. Make a Laptop charger (efficient and reliable) from a car battery 12v

Today we are going learn a new type of circuit generally known RC circuit or capacitive power supply, which is the simplest and Cheapest circuit you will find ever.

I have created this Circuit during my research on how to increasing the power output of electronic or transformer less power supply for capacitive loads.

So now the question arises here is that - How to make this great and easy piece of Transformerless Electronic Power Supply or LED driver circuit at home.

C1= 400V, 1395K Capacitor or (Connect three 400v/475k or two 2uF/400V capacitor in parallel for 1.2Ampere or higher capacitance for higher current according to the calculations explained below).

R1= 10M ohm or 1M ohm 1watt resistor.

D1-D4= IN5408 (4 DIODES)( just choose diodes which have double ratig for our curent requirement for e.g. for 2 amp choose diode of rating 4 amp...)

R2= 10 ohm 1 or 2 watt.( 2 watt will be better for heat handling or dissipation)

C2= 1000uF(micro faraday) ,50 v ( 2 in number if you finds the output is fluctuating, connect them in parallel for better filtering of ripples produced due to rectification of AC mains current).

z1= zener of 15v to prevent any voltage fluctuations caused due to input voltage fluctuation to regulate our DC output to maximum of 15 volt max in extreme case.

{note: you must add a 10M or 1M ohm as a bleeder resistance parallel to C2 for Discharging the charge stored in C2 otherwise you may get a high current shock or surge current dur to charge stored in the capacitor if this charge is not discharged when circuit is not in operation it is going to remain for very long time and someone may get the shock. In later posts we will learn the techenique to remove any surge current by incorporating a crowbar circuit at the output. So simply to understand better this circuit and make it simple simply connect a higher value capacitor across capacitor C1.}

{Do not touch any terminals with bare hands even the Driver is Unplugged. First discharge the C1 and C2 by shorting the input and output terminal together. there will be spark generated while doing this this means charge stored is discharged completely by you now. Only after that you should touch any terminal, or leave for some time before touching the terminals so that bleeder resistance work for you to discharge the charge stored in capacitor C1.}


If we use 2uF/400V(because it is readily available in the market) THEN :

the capacitive reactance offered by capacitor(2uF/400V) connected at mains supply is:
x= 1/(2*pi*f*c) where pi is 22/7, and f is the frequency of mains supply eg 50Hz or 60Hz
now reactance or impidence ( or simply resistance) of whole ckt is = sqrt(R+x) where R is the resistance or load and wires all together attached in circuit and sqrt means squareroot of (R+X)
now out put current i=(v/z) where v= mains voltage 220v or 111v
So you can now calculate the capacitance of circuit according to the required current.

If you want to increase the output current just simply increases the capacitance value of C1 or just by Adding more C1 together in parallel if you are unable to find the appropriate value capacitor in market.

The C2 here only used as a filter to reduce the ripples in the output waveform.( it acts as filter to smoothen the output DC desired.)

Z1 is zener to protect the appliances from overvoltages.

If you want to decrease the voltage rating just use appropriate zener diode

If you wanted to increase the voltage rating of the circuit to double just use doubler circuit to double the voltage but the catch is that the current will become half and frequency become twice means 120Hz. so according to your requirement just increase the output DC current by simply adding high capacitance capacitor or add more C1 in parallel if you need high output DC voltage

For capacitance C1 related calculation problems or any problem regarding this explained circuit please reply in comment section and i will be happy to help by reply ASAP.

If you find above circuit interesting or useful please share it will be our reward from your side.

 Thank you for Reading.