AVR-Chat

--- In AVR-Chat@yahoogroups.com, "Emerson Santos" 
<emersonsantosrj@u...> wrote:

> Anyone , build this circuit ??
> http://avr.openchip.org/bootice/old_index.html 
> I like know, if is a better circuit to JTAG ICE

There are several "clones" of the JTAG-ICE available using variations 
of this circuit. They lack many features of the JTAG ICE, but also 
lack the $300 price tag. The Olimex was the first, I think, but I 
would not recommend this. The design is very poor. So poor, in fact, 
that I have also designed a JTAG ICE clone, which I will soon be 
offering in production for about $40.00 US, shipping worldwide. For a 
preview, please see:
http://www.ecrostech.com/Products/AvrJtagIce/Intro.htm

Making your own JTAG ICE is a nice project. But, if you want a JTAG 
ICE to use to get work done, for heaven's sake buy one. By the time 
you've had a PCB made your own will cost you more. Also, as soon as 
something is not working, how do you know whether it's the target 
system or the JTAG ICE? I have designed my JTAG ICE very carefully to 
avoid any possible interference with the target system either through 
EMI or power supply coupling. It is also so small it requires no desk 
space and sits on the target system connector.

Graham.