Showing posts with label 12v. Show all posts
Showing posts with label 12v. Show all posts

Tuesday, 14 March 2017

Make a Simple 12 Volt 1Amp Power Supply with transformer

Today we are going to make a 12 volt power supply that can supply maximum 1 amp with a simple transformer.
When we require a regulated 12V and 1Amp power supply it is little expensive when you buy it. But it is cheap & easy if you know the right recipe.

Items required:

Things that you require to make this awesome simple power supply are mentioned below:

(1)1N4001 diodes
(3)Regulator Transformer  having output of 14v - 35v AC with an output current between 100mA to 1A, depending on how much power you need.
(4)1000uF - 4700uF capacitor
(5)1uF capacitor
(6)Two 100nF capacitors
(7)Jumper wires (You can use simple plain wire as jumper wires)
(8)Heatsink (optional)

Circuit Diagram:

If you want a 5 volt power supply, just simply replace the LM7812 to a LM7805 regulator.

You can check the datasheet of the IC for ready reference.

For 1Amp we require heatsink for the regulator, otherwise it will generate too much heat and possibly will burn out.
However, if you require few hundred milliamps (lower than 500mA) then we don't need heatsink for the regulator. Although it will become slight warm.
Dear friends, simply build this amazing power supply and enjoy.

If you have any further questions please feel free to ask them in comment section,  I will try to answer them all.

Friday, 15 January 2016

Automatic simple 12V 100mA NiCd Battery Charger circuit

Today we are going to learn how to make a very cheap NiCd battery charger with overvoltage protection or control circuit. This circuit is very much simple and specifically designed for 12V NiCd battery. The charger have current and voltage control at the same time.

Its charging current is around 100mA but we can change it using the formula : (Vd1 - 0.7) / R2 ; where Vd1 is voltage of zener diode D1.

Its Cutoff voltage is limited to Vd2 - 0.7 ; where Vd2 is voltage of zener diode D2

Part List:-

R1 - 2.7 kilo ohms 1/4watt

R2 - 56 ohms 1Watt

D1 - 1N4735A or any 6.2V zener diode

D2 - 1N5244B or any 6.2V zener diode

D3 - 1N4001 or similar diode

Q1 - 9013, 2N2222 or similar NPN transistor

Q2 - 2N3440 or similar NPN transistor

Simply solder the above circuit and enjoy simple 12v 100 mA or change it.

For any further querry please ask them in comment section. I wil be happy to help.

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

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.