Please tell me the alternatives of these

[shaiqbashir]

Hi Guys!

How are you?

well! im trying to make the following project:


http://www.electronics-lab.com/projects/pc/023/index.html

Now the problem is that following parts are not available in my areas:

400MHz resonator
200MHz resonator

remember that the author of this circuit has advised me that you can use a resonator for producing this frequency. Now the problem is this that in my market, such large resonators are not available. Please tell me some alternative, so that i can make this project. Secondly, do anyone think that this project has any faults in it?

If yes then please point out them to me.

Thanks in advance

Good Bye!

 

[russlk2]

High frequency crystals are of the overtone type and will not oscillate at the correct frequency in that circuit, if it oscillates at all.

 

[audioguru2]

Hi Shaiq,
The IR receiver seems to have its IR diodes forward-biased and conducting all the time. They are shown upside-down!

All IR communication circuits I've seen have the IR diode reverse-biased like this one:

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