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Modulation just means modifying one signal with another. In the most fundamental kind of modulation, amplitude modulation (AM), the amplitude of a high frequency sinusoidal 'carrier' wave is made to …

I don't recall the details of the 68K series well enough, but here's the gist of an idea: if your RAM is fast enough, and the two CPU clocks are derived from the same master oscillator, you may be abl …

If those are truly old fashioned phones, (e.g., like 1950's phones) there is probably a way to interconnect things without needing any active elements. After all, at the time when they were designed ( …

It helps to understand that a PCI bus controller forms an interface between a processor local bus, i.e., the CPU's native bus structure, and the PCI adapter bus. Suppose your CPU wants to write data t …

If the supplies on both the boards are isolated, e.g., batteries or most wall-warts, you just need to bridge the grounds together, which provides the return path for the signal you want to use. If yo …

The 74HC595 is CMOS technology so it should take almost nothing in the way of current to drive it, so IR drop wouldn't be a concern. As long as you keep the frequency of the signals down below say 1 …