Unique Application for 8051 mcu project ?
Post by J9
Look at this place
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This is an answer of mine to an old post - 2006
I've seen on the net the schematics for RS232 with Opto-Isolation. The supply on the PC side is from the PC. The supply from the line side is external? I've seen the 3 connectors (RX, TX & GND) together with 2 connectors 5V. One of them is connected to the device. How about the other? Needs additional power source?
Could you send me the PCB and component layout, as well as the component list, I'm afraid to get mistaken
mail from CS
The the circuit you are referring to is... RS232 Isolation
The Blue line indicates the Optical Isolation, no wires or cooper should cross this line. Yes the PC Powers the left side, The supply to the right side is the Microcontroller supply. The Microcontroller will have a +5 and GND use this for the right side of opto. I have no PCB for this. You can make your own PCB using eagle cad. I made this circuit as i could not risk my PC and had no other components. I had to make a high voltage measurement with the PC, so this caution.
CadSoft Online: Home of the EAGLE Layout Editor
Home of the EAGLE Layout Editor. Welcome to the CadSoft Computer web site. If you are looking for an easy to use, powerful and affordable schematic capture ...
Also use the Max232 if you do no need 1KV Optical Isolation.
MAX232
A MAX232 chip has long been using in many uC boards. It provides 2-channel RS232C port and requires external 10uF capacitors. Carefully check the polarity ...
See other Circuits which are easier to build here.
Discover Circuits - Opto-Isolator Coupler Circuits
RS232 to RS232 Port Powered Optical Isolator: Brochure with schematic in PDF format / (added 7/02). RS232C Circuit has Galvanic Isolation:
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