Circuit Project Electronic

This circuit has proven useful when interfacing my computer to home made robotics. It is easy to build and use and it can control two DC motors of any current or voltage rating, depending on the rating of the relays. The circuit also provides two shaft encoders for positional feedback to the computer.
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This is a simple serial port buffer circuit I designed for a friend to speed up his SLIP connection in campus computer network “TRINET” of Helsinki University of Technology. The problem in the network was that the RS232 commections from rooms to terminal server were long and made of bad quality wiring.
The circuit is a [...]

In a flash memory write mode, a microcomputer operation mode setting circuit sets a mode setting signal at one level. At this stage, a voltage drop caused by an LPF formed of a resistor, an inductor, and a capacitor can be suppressed at a low level. In a mode other than the flash memory [...]