RS-232 Levels Adapter

by maccasoft.
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2 layer board of 2.35x1.26 inches (59.69x32.08 mm).
Shared on June 21st, 2016 11:40.

Simple transistor-based RS-232 levels adapter.

Output levels on CONN2 are translated to Vcc level, verified with 5v and 3.3v.

Parts List

R1 = 4.700 ohm ¼ watt
R2 = 4.700 ohm ¼ watt
R3 = 4.700 ohm ¼ watt
R4 = 1.000 ohm ¼ watt
R5 = 4.700 ohm ¼ watt
R6 = 4.700 ohm ¼ watt
TR1 = Transistor NPN BC547
TR2 = Transistor NPN BC547
TR3 = Transistor PNP BC557
CONN1 = DB9 Female Connector

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