# Led Flasher

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#### Etherx

##### New Member
Im building one of it, as title as im trying from and im using quite a different parts from it. Im using 10 Mhz Crystal Oscillator (2 pin) instead of 10 Mhz Ceramic Resonator (3 pin). The question is, in the drawing its says that i should put into point 15 and 16 at the IC sockect (Resonator) and the other one loop it into ground. So how should i do it with Crystal Oscillator since it only have 2 pin. Thanks in advanced

#### audioguru

##### Well-Known Member
The schematic of the project shows that the ceramic resonator has a built-in capacitor from each oscillator pin of the PIC to the 3rd pin on the resonator. Then these two capacitors connect to ground when the 3rd pin connects to ground.
Any PIC circuit that uses a crystal oscillator also shows two added capacitors the same because most crystals do not have the capacitors built-in.
Did you look at the crystal oscillator circuit in the datasheet for the PIC?

#### Etherx

##### New Member
Yes i did. Well at first, i didnt realize that crystal oscillator didn`t have a capacitor build in, since i thought those two would be the same. I found several acticles saying that those two components do almost the same thing, but crystals is cheaper, and so i tried. Two capacitors, and it works. Thanks a bunch

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