Welcome to our site! EDAboard.com is an international Electronics Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.
sorry about that.
i follow this circuit but i using 4 4.7uF connect with max232.
max232 tx output is 4.2V, but when i connect to PC serial pin 2 voltage become 0.3V only.
and PC serial pin 3 voltage actually is how much??
i using multimeter measure is -10V when connect with my max232 become -9V is it correct??