PC based Robot Circuit

In order to create the circuitry below, you need a computer software that will control your parallel port. It will cost you about 30 US$. For example, a transistor (model number 2N2222) costs ~50, a DPDT relay, ~1. 75$ (this is maybe the most expensive piece, you need 7). This implementation uses IC-sockets to hold the pieces. That way, they are not soldered and can be replaced easily. Instead of two 18-pin sockets, you could use 10- and a 18-pin sockets.

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