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Hi,everyone!
Could somebody help me,i have got some confuse when i solder the components on PCB design by Dmitri.
1.On the digital PCB board have R2 and R8 solder holes,but in the Complete definitive list of materials to order,there are not list these two Resistors,are these two Resistors unnecessary?
2.Solder the Capacitors on the digital PCB board C1 position How to sure that which hole is '+' and which is '-' ? See the pic under.
3. On the both analogue and digital board ,i can't find the 100n Capacitors,can i use the 104n Capacitors to replace them?

thanks very much.

isque wrote:1.On the digital PCB board have R2 and R8 solder holes,but in the Complete definitive list of materials to order,there are not list these two Resistors,are these two Resistors unnecessary?

That list might be outdated. Check the one that comes with the digital board schematic here. R2 and R8 are required.

isque wrote:2.Solder the Capacitors on the digital PCB board C1 position How to sure that which hole is '+' and which is '-' ? See the pic under.

The picture doesn't load. C1 is a ceramic capacitor and therefore has no polarity. If, however, you decided to use an electrolytic/tantulum cap in there, then it is supposed to have "+" or "-" marks on it. "-" goes to the ground.

isque wrote:3. On the both analogue and digital board ,i can't find the 100n Capacitors,can i use the 104n Capacitors to replace them?

Yes, you can.

Thank you very much,Firelord! I have changed the picture load URL,if you saw that pic,could you help me to check the other components correct or not?

The PCB is of very decent quality! About the components, I'm not too good at recognising resistors via a color chart (I use SMD resistors almost all the time), but if you were accurate when choosing and soldering them in I guess you should have no problems. C1 should be a ceramic cap and so it doesn't matter how you solder it in.

However, should you wish to put the electrolytic cap (on your picture) in there, locate the "-" sign in the (shortest of the two capacitor pins) and put it in as follows:

Thanks a lot,Firelord.