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TOPIC: transistor buffered jtag
#330
slugworth (User)
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transistor buffered jtag 1 Month ago Karma: 3  
For people that can't get the 74HC244 chip to make a buffered jtag.
This uses common NPN transistors and 10k 1/8w resistors.
You need to tap +3.3v and +5v from inside your receiver.
I left the pin details out because it can be used for different
jtag programs and the wiring will depend on what you are using it for.
 
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#332
9u4rk (User)
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Re:transistor buffered jtag 1 Month ago Karma: 0  
Hi guys.

Nice, @slugworth. I do have a buffered JTAG interface (which I'm not using at the moment... ) but this schematic is quite simple to build and can help a lot of people.

Best regards.
 
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#333
slugworth (User)
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Re:transistor buffered jtag 1 Month ago Karma: 3  
I used it with the old ejtag_tt program and conexant processors (cx2414x)
I wanted to build a buffered jtag quickly and those were the easiest
parts to get locally.
The ejtag_tt was the first program I had to use a buffered jtag with.
 
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