Showing posts with label misc. Show all posts
Showing posts with label misc. Show all posts

Friday, 28 November 2014

Make 400V DC from 220V AC Circuit

How to Make a 400V DC from 220V AC Simple Circuit at home.


Today we are going to need a simple 400V Electronic transformerless power supply or variable power supply from 0 to 400V DC. So simply we will learn how to get 400V DC from 220V AC Mains.

The Below Circuit is a simple rectifier circuit.

This circuit simply rectifies the 220V AC from Mains to DC pulsating Voltage and then this pulsating DC viltage is then Filtered via a 470uF/450V electrolytic capacitor to reduce the Ripple present in the output of the circuit.

Friday, 21 November 2014

Make Automatic 12V Portable Battery Charger Circuitat

How to make a Automatic 12 V Portable Battery Charger Circuit at Home


Today we are going to learn how to make a Portable Automatic 12 volt battery charger circuit which starts charging Battery Automatically when the voltage of that Battery is below the specified voltage value. This charger will Automatically stops the charging process when Battery attains the full charge value. This process protect our battery from deep-charge and if voltage is below 12 V it start charging.

Here the main component is IC LM317. Here the power source is transformer but it can be any electronic supply ( for example SMPS power supply).

Components Required:

  • 15-0-15V, 1A center tapped transformer 
  • LM317T voltage regulator
  • 12V DC battery
  • BD139 NPN transistor
  • LED’s – red, green
  • 8.2V zener diode
  • 1n4007 diodes – 3

Tuesday, 18 November 2014

Make a PWM Controlled Cell Phon Battery Charger using IC555

How to Make a Simple PWM Controlled DC to DC Cell Phone Charger Circuit vy using IC 555 at Home

Today we are going to learn how to make a very simple PWM DC to DC Cell phon charger circuit. The circuit is a simple cell phone charger that may be operated with any DC source, from a car or a motorcycle battery or from any ordinary 12 V AC DC adapter. Nowadays we find most of the vehicles have their in built cell phone battery charger units which surely becomes very handy for travelers who mostly remain outdoors travelling in their vehicle.
This PWM cell phone battery charger circuit is as good as the conventional chargers which come fitted inside the cars and bikes. Moreover the circuit can be simply integrated to ones own vehicle if the feature is not originally available in the vehicle. Alternatively one may think of manufacturing the present unit and selling them in the market as an automobile cell phone charger and earn some hard bucks.

Monday, 17 November 2014

Make a Simple Solar MPPT Charger Circuit at Home

How to Make a Solar MPPT Charger Circuit - Maximum Power Point Tracker Circuit

Todat we are going to to learn how to make a simple but effective and cheap solar MPPT Charger circuit at home. Here MPPT stands for maximum power point tracker, which is an electronic charging system designed for optimizing the varying power output from a solar panel module such that the connected battery exploits the maximum available power from the solar panel.
The output from a solar panel is directly proportional to the degree of the incident sunlight, and also the ambient temperature. When the sun  rays are perpendicular to the solar panel, it generates the maximum amount of Power, and deteriorates as the angle shifts away from 90 degrees  The atmospheric temperature around the panel also affects the efficiency of the panel, whose power falls with increase in the atmospheric temperature.
Therefore we may conclude that when the sun rays are near to 90 degrees over the panel and when the temperature is around 30 degrees, the efficiency of the panel is maximum, Here the rate decreases as the above two parameters drift away from their rated values.

Sunday, 16 November 2014

Make parallel Battery Charger Circuit by SPDT switches

How to Make Parallel Battery charger Circuit Using One Charger by SPDT Switches

Today we are going to learn how to charge multiple batteries individually which is connected in parallel using a single battery charger through a manual SPDT changeover switch bank. This simple circuit might be a very useful circuit for those who have lots of battery and they don't wanted to do that manually process  of charging batteries.

In below diagram, here the configuration shows four batteries with their negatives connected together to form a common negative rail and the positives are all terminated individually to the poles of four discretely attached SPDT switches.

The one of the two changeover contacts of the SPDT switches are appropriately connected with the output load while the others with the battery charger positive.

All the above terminations are made via separate rectifier diodes, each for output and input positives

Friday, 14 November 2014

Make a Laptop charger (efficient and reliable) from a car battery 12v at home

Make a Laptop Charger from a Car Battery -12 V DC Laptop Charger Circuit


Todays post simply explains a simple circuit which can be used for charging a laptop while driving in car or some other vehicle or from a DC battery. The circuit works without using an inverter or inductors in its configuration.

The good thing about this circuit is that it does not rely on an inductor topology for the required actions, making the design vgyery simpler, and yet efficient and effective.

As most of us know a laptop iis powered by a DC potential from an in built Li-Ion battery just as our cell phones do.

Normally we use a AC to DC adapter for charging a laptop battery at homes and offices, these adapters or chargers are actually SMPS power supplies rated with the required and matching specifications of the laptop battery.

However the above power supply units work only with AC supplies, and in places where an AC outlet may be available. These units will not of any use or work in places where an AC source is not present such as in cars and other similar vehicles and electricity deprived areas. This extremely useful little circuit presented here will allow a laptop battery to be charged even from a DC source such yas a car or truck batteries (12Volt).

It is a very simple, useful, cheap, versatile and universal circuit which may be dimensioned for charging all types of laptops by little adjusting the relevant
components provided in the circuit. It's a simple plug and play charger circuit.

Normally most of the laptop chargers are rated at 19V 3.5Amps, however some may be rated at higher currents to facilitating fast charging.

The discussed circuit has a voltage adjustment features (via PWM-

Make a 5V 2A Power supply by IC 78S05 simple circuit at home

How to make a 5V 2A simple electronic power supply using IC 78S05 at home to charge cell phon battery.


Today we are going to learn how to make a simplest 5 volt 2Amp DC simple power supply which can be used in various application like cell phon battery chargers like in Tabs ehich requires high current, LED Drivers which require less than 6 volt and high current , can bye used to charge a cell phon batttery using solar panel e.t.c. at home.

This circuit is extremely simple and easy to make, simple to use and with very less component used.

The main component in this circuit is IC 78S05 which is a Voltage regulator 5V / 2A DC. The quality of current is high and noise is low.

The circuit will work without any extra components, but for reverse polarity protection a 1N5402 diode is included for safety at the input, extra filtering and removing any ripple is being done by capacitor C1-220uF 50V.

Thursday, 13 November 2014

Convert SMPS to solar battery charger circuit simple at home.

Convert any SMPS circuit to solar battery bank charger


Today we are going to learn how to convert or make a simple SMPS (Switched Mode Power Supply) solar battery charger circuit easily at home just by simply slightly modifying any SMPS electronic power supply.

The post wi try to explains a very novel way of
using an ordinary SMPS unit for charging a battery bank via solar panels.

The method will result in an
extremely efficient, compact, lightweight and fast solar charging of the connected battery.

SMPS ( switched mode power supply) have become very common these days and we find them being used in the form of of low voltage DC units wherever needed. The best example is our cell phone chargers which are actually compact SMPS 5V DC chargers via 110v / 220v ac input.

Solar power is becomming cheap and environment friendly and also becomming popular these days and guys are constantly in look out for good options in the form of solar chargers having the most efficient and fast charging response.

Solar panels or PV devices are normally utilized for charging lead acid batteries which tends to takep relatively long hour for getting fully charged, and especially when the sunlight conditions are bad things start getting even more sluggish.

For solution to the above problem is rather for enabling quicker charging from solar panels, special MPPT (maximum power point tracking) based solar chargers have been developed which effectively monitor the solar panel maximum power point levels and generate the most efficient charging conditions for the connected battery or battery bank to it.

In this post we are going to finf most efficient way of charging our battery or battery bank through a solar panel.

As proposed in one of my previous Post, a switch mode based power supply (SMPS) is probably the best option for making it work as a solar charger circuit, so here we will learn how to make an smps based solar charger circuit.

Making an SMPS can be quite complex and might require considerable amount of time and knowledge for the implementations so here rather we will only focus on how to convert a ready made smps into an effective solar smps battery charger circuit quickly.

For this we will require the
following materials, assuming the battery to be charged is 12V rated: A ready made 120V or 220V to 12V SMPS unit having current ratinh equal to 1/5th of the battery AH which is to be charged for example if battery is of 12 v 100 Ah then 20 amp will be best selection.

Connect all Solar Panels in series making  total open circuit voltage equals around 100V. Then connect wires.

How to Proceed.

As we all know a normal mains SMPS may be rated with minimum of 85V to 100V input in order to provide the required output DC, let's assume it to be 12V, meaning for acquiring 12V it must be supplied with a minimum of 100V at the input terminal.

Keeping the above issue in mine we must select a solar panel which is able to produce approximately 100V to 220 volt any, for making the coverted SMPS work nice.

Since PV panels with such high voltage might not be available, we may opt for many low voltage solar panel connected in series for generating the above voltage. For instance you can go for 3nos. of 30V solar panels and connect them in series to get 90V from it, which might just do the job.

The above input supplied to the procured SMPS would generate the required 12V which may be directly attached to the battery for charging it efficiently.

However a 12V supply might not charge a 12V battery we need at least 14V

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.

Wednesday, 23 April 2014

Automatic Emergency Light Circuit

How to make an Automatic Emergency Light Circuit for simple home uses using led lights.


Today we are going to learn how to make a Automatic Emergency light circuit or Electronic candlefor simple home Power failure situations. Most of the time when unexpectedly power failure occurs suddenly we require a Light dource to see things in the room. For this purpose we are going to make an Efficient Emergency Light which Automatically turns-ON when power failure occurs.

Components Required:

Any Charger suitable for your battery, or 220V to 4.5V / 600mA Transformer D1 = 1N4004D2 = 1N4001R1 = 33Ω/1WattR2 = 470ΩC1 = 470µF/16VT1 = 2SB242 ( This is a pnp type transistor)LED's = Buy 4v led's( 8) Battery = Li-ion 4.5v 4AH or any battery either it is 12v or 6v but you need the good Charger for that battery in my case and also Increase the rating of diodes.

Thursday, 10 April 2014

Intelligent Automatic Battery Carger circuit

How to Make the Intelligent Fully Automatic Fast, Efficient Battery Charger circuit at home.


While i was searching for fully automatic battery charger or fast diehard battery charger what i found on google was only crap but nothing, I dont know either most of the people dont know what exactly fast battery charger is or they dont want to share that with public. Today i am going to explain How to make a intelligent fully automatic battery charger(6v 12v 48v or any) circuit.

First you should know that, we can not charge the lead acid batteries faster because Lead acid batteries are not designed to accept high current level continuously.

How fast charging is Done:

For charging the batteries faster we apply the full dose of  high current specified for that battery and when full charged automatically switch off the charging to prevent battery from overcharge. It works best for Li-ion batteries

The bottom line with Lead Acid batteries is that these can not be charged quickly unless a intelligent Automatic circuitary is incorporated.

Fast charging, It should be done in step wise mechanism means initially we charge using X1 rate and then gradually reducing the rate of charging to X1/10
as battery is getting charged we need to slow down the charging rate to prevent battery from damage and overheat. And when battery becomes full charged that need to autocut the charging operation.

Wednesday, 9 April 2014

Fastest 10minute Battery Charger circuit.

How to make Easiest 10-15 minute fastest Battery Charger

Today i am going to explain how we can make the worlds fastest battery charger circuit at home in 5 minutes. It uses the most basic principle although it should be taken care that battery should not overcharged because it charges faster than any other charger.
The fast chargers out in the market actually is useless because i actually dont understand why their output current is much higher than specification of the battery. it may charge the battery faster like in 10 minutes but battery sooner become dead and useless and expands. They actually have no idea how fast charging works.
so just not wasting our precious time lets get started.

Here the components required is very popular and cheap so just dont worry you will get those components in seconds...

Components Required:

1. One rectifier diode IN5402, or IN5408, any you can find quick.
2. One incandescent bulb, having nearly exact voltage rating as the battery but current rating of the bulb should be 1/10 of the value of battery AH (AmpereHour).

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.