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RS232 with single power supply

Based on a Labs project | October 2011 | Find it here
RS232 with single power supply
In most personal computers, the power supply provides +5 V and ±12 V lines. The positive 12 V line is needed for the disk drives, and the ±l2 V für the RS232 interface. Over the past few years, ICs have become available (such as the MAX232) that can drive serial channels (which need ±12 V) from a single +5 V line.
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