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

Hi,

I have had very similar problems with my SX-Tech board.  I've burnt out about 4 SX-28 chips when all
I've got connected is a resistor and an LED !  When I connect the power the green power LED on the board
itself goes dim.  Then the SX gets very hot and dies.  All is well after a new SX is put in.

I put it down to me using a very bad PSU that was transformer based and said it was 9V but sometimes
it went to 15V.  Have now started using a 9V one which is 'switched mode' and will deliver 9V constantly.

I've had no problems since.

Tony

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