Indeed, it is quite hard to figure out how to make a decent product like these and survive at the low price. Those thing normally sold at US$50 range, not sure why it can go so low. Even considering the "CAD$24.99", it is still a good bargain as long as it can output 100W AC to operate a laptop. Funny N. Au Group Electronics, http://www.AuElectronics.com http://www.AuElectronics.com/products http://augroups.blogspot.com/ ________________________________ From: Harold Hallikainen To: Microcontroller discussion list - Public. Sent: Mon, November 23, 2009 11:14:07 AM Subject: Re: [EE]Good deals on DC AC inverters. These are interesting products, and I'm always amazed at how low cost a consumer product can be. I think these typically have a flyback converter that converts the 12VDC to +/-170VDC. They then have an H-bridge that switches the +/-170VDC out at 60Hz. A rectangular waveform is used with the duty cycle set so the RMS is 120VAC and the peak voltage is 170V. Doing all that for $17 is quite a trick! Harold -- FCC Rules Updated Daily at http://www.hallikainen.com - Advertising opportunities available! -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist