This DIY 12V to 220V to converter is built with CMOS 4047 that is the main component of this small voltage converter that transforms a 12VDC into 220VAC. 4047 is used as an astable mutivibrator, at pins 10 and 11 will have a symmetrical rectangular signal (square wave) which is amplified by 2 Darlington transistors and finally reach the secondary coil of mains transformer (2x10V/60W).
Video Presentation 1 – without load
Video Presentation 2 – with load (light bulb)
With the help of P1 the output frequency can be adjusted between 50Hz to 400Hz. Although this is not part of any professional dc ac converter it can be used quite effective on some home appliances. Be aware that the output signal is square and not sine wave. So you cannot use it for powering TV, Laptops, monitors. Use it only for lighting, power tools and other non-expensive equipment.
I used BD651 transistors instead of BD699.
For more DC to AC voltage converters check the related posts.
Check out the tags for more 12 Volts to 220 Volts converters.