In SX Microcontrollers, SX/B Compiler and SX-Key Tool, tdg8934 wrote:

I am using a standard Parallax 7.5vdc (1000 mA) wall transformer that I also use on my Professional Development Board which works fine for SX-Key programming. I read 4.98vdc on the SX-key pins and pins 2 and 4 of the SX-28 and the software in the SX-28 runs fine. I just can't program it with the SX-Key on my soldered board version of Gunther's SX-28 circuit. I read 10.28vdc on the wall transformer comming into the 7805 circuit. I have a 100 uf cap on the input and ground of the 7805. I have a 10 uf and 0.001 uf cap on the output (5v) of the 7805. 

[url=http://forums.parallax.com/forums/?f=21&m=140005&g=140005#m140005]http://forums.parallax.com/forums/?f=21&m=140005&g=140005#m140005[/url]

This is my circuit.

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