12v to 120v voltage inverter circuit

Posted on Feb 6, 2014

A simple 12 volt inverter circuit. This 120V AC power source is built with a simple 120V:24V center-tapped control transformer and four additional component. This circuit outputs a clean 200-V pk-pk square wave at 60 Hz and can supply up to 20W. The circuit is self-starting and free-running. If Q1 is faster and has a higher gain than Q2 is

Click here to download the full size of the above Circuit.

will turn on first when you apply the input power and will hold Q2 off. Load current and transformer magnetizing current then flows in the upper half of the primary winding, and auto transformer action supplies the base drive until the transformer saturates. When that action occuts, Q1 loses its base drive. As it turns off, the transformer voltage reverse, turning Q2 on and repeating the cycle. The output frequency depends on the transformer iron and input voltage but not on the load. The frequency range between 50 to 60 Hz with a 60-Hz transformer and car battery or equivalent source. The output voltage depends on turns ratio and the difference between input voltage and transistor saturation voltage. For higher power, use larger transformers and transistors. This type of 12V inverter normally is used in radios, phonographs, hand tools, shavers and small fluorescent lamps. It will not work with reactive loads (motors) or loads with inrush currents, such as coffee pots, frying pans and heaters.

Leave Comment

characters left:

Related Circuits

Cell Phone Controlled Home Appliance circuit

Ever Imagined controlling your home appliances using your cell phone. You can find a lot of circuits for this application. But they make use of Telephone. I modified the circuit and redesigned it...

Circuit for controlling 8 appliances using TV Remote

The IR circuit can be used to switch devices using TV Remote. Normal circuits can switch only one device. But using this circuit, different devices can be controlled using same remote with...

Serial COM port using ATmega8

Many times, I have written code for UART communication and when it came to testing, my laptop does not have a serial port. I bought a USB to serial port converter but it didnt worked. I felt...

de amst wiskar: robot line folower

One of my student has made a disgraceful robot that used two stepper motors and with a simple IR sensor. Yes, above picture is what I`m talking. Without battery carrying, a little bit torque of the...

Dual cable (serial + USB) for Nikon coolpixes

To assure that USB and serial segments are electrically isolated, we used an optocoupler (U1). The LED section of U1 is driven directly by DTR, so we should select a very sensitive optocoupler to...

classic led flasher circuit

This LED flasher circuit is a classic two transistor flip flop. This flasher circuit is very popular and it`s usually the first circuit to build when starting electronic circuit building hobby....

ac-motor-control-circuits

Perhaps the most challenging aspect of interpreting ladder diagrams, for people more familiar with electronic schematic diagrams, is how electromechanical relays are represented. Compare these two...

Stamp9G20

This document was written with care, but errors cannot be excluded. Neither the company named above nor the seller assumes legal liability for mistakes, resulting operational errors or the...

New Circuits

Zero consumption Anti-theft High power Code Switch for E-Bike Batteries

This project fits more for custom made battery casing that can have more space to hide things inside. This switch with few alterations can be used for any other project as well but is designed based on e-bike needs! This project use a clever functionality of....
Ultrasonic distance finder circuit

The circuit described here uses ultrasonic oscillations and operates based on the propagation velocity of these oscillations in the air. Thus, we can easily determine the distance of two points if the time within which the wave travels this distance is....
Simple Metal detector circuit with CD4030

Sometimes the precious metals are hidden too deep and are not detected except with complicated devices. In many cases, however, small pieces of precious metal buried near the surface can be detected by relatively simple means. Everyone is very attractive to....
Fully automatic watering circuit for flower pots

Many times for various reasons we forget or can not water the plants that we have in our homes. And many humidity sensors units just notify us with a beeping sound or with a flashing light, that the pot needs watering. But what if we are away from home? This....
Simple deep searching metal detector circuit

The principle behind a metal detector is really very simple. Proof of this is the circuit that follows, in which it proves that the construction of a metal detector can be done in the minute, with few components that we find very easily everywhere. With the....
Sub-Harmonic Bass Converter for Electric Guitars

The sub-harmonic bass generator is a sound producing unit for guitars. The sound it produces looks very much like that of the bass guitar. The octave generator is sometimes quite unusual since it does not produce any of the usual ways of coloring the sound,....
Echo Depth Sounding Sonar for Boats

In the past the sounding (sea bottom measurement) was done with the "bullet", that is, with a heavy lead object that the seamen plucked into the sea hung from a calibrated rope. As soon as the "bullet" reached the bottom, the depth appeared directly from the....
100W HiFi Audio Amplifier Circuit

This Amplifier was designed to have the following specifications: Distortion less than 0.1% at full power of 100W even at 20KHz. Power has to be attributed to an extended bandwidth. The output transistors must be protected against short circuits. The power....
Plant-Pot Water Level Indicator Circuit

A series of LEDs serve to alert the gardener when plants need water. Using two conventional digital integrated LEDs and a series of LEDs, we make a very useful device for gardening. The device detects the amount of water in the pot and alerts the grower.....

Create NOW your QR MENU for your Restaurant / Hotel / Bar / Caffe,

Comprehensive ordering/paying features. fully personalized to suit your Business.

Update Anytime! Easy and Simple!

Popular Circuits

Ac-To-Dc Converter

By coupling two back-to-back diodes in series with an ac power circuit, a voltage of about 1.4...

high voltage ac calibrator circuit

This a application circuit for calibration. This circuit is called high voltage AC calibrator...

Schematics Touch Activated Alarm

C1/C2`s working voltage ought to be elevated to 25V in the event you decide to go with a 12V...

Sp6648 Flashlight Application

The Infrared (IR) LED used in a remote control is an application for an LED Driver that has...

60 Light Sequencer using a Matrix

The circuit below illustrates using a 10x10 matrix to sequence up to 100 LEDs with just three ICs...

Odd application of neon glow lamps

Neon glow lamps can also be used only for their U/I characteristic and not for producing light....

Low-Power Car/Bike USB Charger

We tested a regular charger and found that it consumed 13mA with no load. Like many others, it...

ZN414 portable Receiver

Designed around the popular ZN414 IC this receiver covers the medium wave band band from...

PGA202 offset voltage correction circuit

As shown for the PGA202 offset voltage correction circuit. PGA202 offset voltage correction...