I have been working on as small project for a couple of days. I am using a home grown board with a standard LM78 series regulator.
I was powering the board with a standard 12VDC wall wort type supply (I assume this was isolated). No problems. The finished project requires a 24VDC supply. I connected one of the 24VDC supplies we are using for several other products (Brick type) and flame on! It almost immediately fried the voltage regulator.
Seeing the error of my ways, I repaired the card, removed the offending supply and went back to the wall wort.
My card works fine with the 12VDC supply or the 24VDC unit but when I connect the JTAG pod the regulator starts to cook. I have inspected the JTAG card and cannot see any damage. The JTAG connects to the computer without issue. All of the leds appear to behave normally.
Can anyone direct me to a schematic of the JTAG unit?
Has anyone dealt with this failure before?
Any suggestions on how to proceed?
Thanks for the assistance.