Simple 40W inverter
Description
This is the schematic of a simple 40W , 12 to 220 V inverter.You don’t believe, this is simple and cheap and working for me for last 4 years.The heart of the circuit is a CD 4047 IC which is wired as an astable multi vibrator here.Resistance and Capacitance at pin 1&2 determines the out put frequency.Here it is set to 60Hz.Due to this a two 180 degree out of phase ,120 Hz , 50% dutycycle waveforms will appear at pin 10 & 11.These waves are amplified by the complementary symmetry amplifier made of transistors BC 337 & TIP 3055 to drive the out put transformer.Don’t get feared of the technical terms, just wire it on a all purpose PCB.It is simple and will work.Don’t worry about the transformer windings ,buy a 220-110-0 primary,12-0-12 secondary , <50W transformer.You can select output voltage of 110V or 220V by a two way switch using such a tranformer.Don’t worry if you don’t have such a transformer, a simple 220 to 12-0-12 will also do the trick sacrificing the 110V option or vice versa.The best way to get a transformer is to break all useless electronic devices in your trash.Most probably you will find the transformer or more components needed here!
Circuit Diagram:
Click to view in full size
Tips :
First wire to oscillator part only.Then check out put Pin 10 &11 of CD4047 to obtain the required wave forms ( two 120Hz ,180 degree out of phase,50% duty cycle waves.
Then connect transistors ,transformer and load (25 W bulb for test).See it working!.
Use a 9-0-9V transformer, NOT 12-0-12 as shown.
Output voltage will be low otherwise.
ups
hey this is great circuit.. it works ..
could you show me a circuit where i can work with 9 volts dry cell instead of 12 volts.
Reply:Dry cells dont work good with inverters.It is always good to use lead acid batteries.If you are planning to use a 9V battery then use a 9-0-9 / 0-110-220 V transformer as TRA
Instead of Bipolar TIP3055, is there any way to use MOSFET such as IRF?
Hello,
Thanks for the simple and easy inverter design, please can u help me to upgrade the circuit to 2000 watts ? , i know that more transistors and a bigger transformer should be added and that the power source should be no less than 48 volts DC , but i don’t know how to put everything together.
Thanks a lot
Nino
Hi,
its a simple and easy inverter design, please can u help me to design a circuit of 2.5k watts ?
Thanks a lot
it will be added soon
what will be the value of resistor and capacitor at pin 1 & 2 to get 50hz and 220v.
i just used a 3055 npn Q ,,,and a 470 .180, and capacitor,,,,,,,,,and a core of am antenna………in the output,,,but it works,,,,,
IRF250 or its equivallent can be used directly in this same circuit. Standard 10-0-10volt inverter transformers can be used. If freewheeling diodes are not built-in in the IRF use IN5404 parellel in reverse biased with IRF.
Thanks,,,,,,,
It really works.
But I want to built an inverter having variable frequency 100-to-10K Hz. Will you pls give me calculations for the same.