RC toys

Communications will likely be through the GSM network (especially GPRS where available), but I found interesting to see how common RC toys work, so I opened the receiver to find out who was the responsible of sending and receiving those 27 MHz. when playing. After some time unscrewing I found that:


Two DC-motors connected to a green board. The top right black cable is the antenna, and the disconnected red and black cables at the bottom left is the power source. I didn’t manage to make it work, since I couldn’t find the transmitter and none of my other transmitters worked at the same frequency (I tried, but no positive result). But anyway I could read the name of the IC in the image:


It’s name is RX-2B, and reading it’s datasheet I could see that there’s another chip with similar name; TX-2B (the ‘R’ is from ‘Receiver’ and the ‘T’ is from ‘Transmitter’). It’s designed for cars, since it’s outputs are labelled as ‘right’, ‘left’, ‘turbo’, ‘forward’, etc.