Incomplete Net on VCC
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Zeanie 3 months ago
Hi, complete noob here. I have done my first schematic and tried to convert to PCB but I keep getting a warning about there being unfinished nets, so I check and it's the Vcc symbol. What would I need to do to correct this? The Vcc on the schematic has a single wire connected to a 1N4148 and then to the rest of the circuit. ![easy.png](//image.easyeda.com/pullimage/tIG2NujLRyyTexahejnsssNn3wbTt2CkZV0upzfO.png)
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andyfierman 3 months ago
Please read and think abut the message in the lower left of the Design Manager panel: ![image.png](//image.easyeda.com/pullimage/wGC9ySXOZrc8RgUzc40yyd8oeRvVEqt5f4rh7cKK.png) The VCC connection is OK. It is just a warning that you have only one connection to it. However, the right hand side of your schematic is wrong. You need to use PNP ttransistors here and reverse the LED polarity: ![image.png](//image.easyeda.com/pullimage/6c4Rui6zEDkWSloW3flXJfGwhTspQm4qjmSGEYx2.png)
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Zeanie 3 months ago
Thanks andyfierman. I thought the BC557C is a PNP Transistor. I am incorrect in thinking that? Has EasyEDA got the wrong item from it's part database for the BC557C? Like I said I am a real noob so don't really understand.
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andyfierman 3 months ago
Sorry I hadn't noticed that they were already PNP. PNP transistors need the opposite supply polarity to NPN. You need to take the right hand side part of the circuit and turn the whole thing upside down so it's a a mirror image of the NPN + LED circuit on the left hand side reflected about the horizontal X axis. In other words swap the ground and positive supply connections to the right hand side.
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andyfierman 3 months ago
If you're a newcomer to electronics then you need to find some learning resources and do some reading. You can use the simulation features of EasyEDA to play with simple circuits and learn about electronics without having to buy or blow up stuff. :)
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andyfierman 3 months ago
Have a look at: [https://easyeda.com/forum/topic/Useful-learning-resources-78a07f9ed4104ce9b15fc7584ac67003](https://easyeda.com/forum/topic/Useful-learning-resources-78a07f9ed4104ce9b15fc7584ac67003)
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Zeanie 3 months ago
@andyfierman Thanks for the great help. Yes, though I have worked in IT for 30 years I have never got around to do electronics and SBC etc, so I am slowly working my way through some youtube videos which is where I got the static detector schematic of sensing Negative Static charges and got his working on a breadboard, so I then tried to build a positive charge detector using the BC557 (opposite version of the NPN BC547). In one of the videos they mention getting the PCB made via JLCPCB and designing with a software packed called EasyEDA, so her I am. Thanks for your advice
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