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Re: 'Most' Onoard Computer Sensors Use 5-volt Reference--Why 5?
Posted to Technical Theory Forum on 11/9/2003

Your small computers use 5 volt supplies for TTL protocol on the circuit boards and the typical computer chip uses this for power. Modern CPU's use less to reduce heat and some chips also need +12, -12, and/or -5 volts.

These computers often communicate with... Login to read more.