GTP USB Lite Problem

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Vikramaditya

Joined: 06 Feb 2009
Posts: 1

06 Feb 2009 16:18 gtp usb lite

I recently built a GTP USB Lite programmer following the documentation on

[url]ali3nworld.blogspot.com
[/url]

When i connect it to my pc , it does not detect the programmer giving a "USB device not recognized" error.

I dont think that there are any hardware errors in my circuit. I cant understand why the circuit does not work.

Also in our college many people have tried building USB programmers for PIC as well as AVR. Unfortunately only 1 out of 5 work. Most of them have the same problem.

Programmers brought from commercial firms also do not work .
Do we need extra precaution while building a USB programmer ?

Can anybody give a hint as to the solution ?