Originally from http://rcatohdmi.com/rca-to-hdmi-converters-cable/
I will take you through some of the products that can help you convert signals from RCA to HDMI and vice versa. First we have the AGPtek Mini HDMI to AV converter that retails for about 30 dollars.
This very affordable gadget is easy to use and portable. If your need is just to output 480i or 480p HDMI signals then this is the device for you.
It doesn’t require external power and the converted signal is free of any noise. The video output is clean and crisp with good color translation and perfect audio across all frequencies. This only works if the user remembers to set the output resolution to 680*480 and audio mix to stereo. Anything above this results to low and distorted output.
More at AGPtek Mini Converter