Electronics > Beginners
pc817 optocoupler
glinjik:
hi i have a little confusion the pc817 shown in this diagram appears to be backwards ie if i use it in the manor shown i would have to put it on the back of the board to get the orientation correct? are there different variants of this chip the one i have is pc817x i also have el817 also is it necessary to cut an isolation slot under the chip and further i see it has a isolated ground? is this back to the bridge rectifier as opposed to ac mains ground, first time im using this chip
the fist picture is in the circuit the second is a pinout i got on google
fourtytwo42:
To many questions in one post but the answer to the first one is your schematic only has a functional symbol for the part with no pin numbers so you simply match the function to the pin, eg emitter is pin 3. There are not different 817's with different pinouts.
glinjik:
thank you but i am still miffed to get the orientation correct i would need it under the board so pin 3 goes to top
hsn93:
to validate your point, you actually have to take picture of the actual board / pcb design not the schematic
austfox:
You are getting confused between the schematic and PCB layout.
Schematic usually has positive at the top and negative at the bottom, mainly for ease of interpretation. When it comes time to design the PCB, you can place your voltage anywhere, your components anywhere and in any orientation.
Keep your optocoupler on the top side with the rest of the components, just ensure the traces between components connect to each other correctly.
Navigation
[0] Message Index
[#] Next page
Go to full version