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Topics - Georg

2
Project logs / DSO nano signal generator fix
I wanted to share a project with you which I lately finished. It's actually a fix. When I was working on a small audio amp circuit I actually used my DSO nano with its signal generator to feed a signal in the circuit and watch the output of the amplifier on the scope. As things go I must have swapped some cables and fried the signal output of the nano in the process.
After a while of searching around I found out that the signal generation is done via a 74HC125, bus buffer. The buffer is driven by an output pin of the DSO nanos ARM controller and sort of 'protects' the controller. I found out that there was still a signal on this output pin so I thought it must have been the 74HC125 which died while swapping the cables. I ordered some of these from ebay and turned to the task of replacing the chip which was rather hard (I have no experience with SMD soldering and no specific equipment for this). Fortunately I succeded and the signal generator is working again.

Thought it maybe usefull if somebody else has the DSO nano and runs into the same trouble. You can read the long version with some pictures on my blog (the link to which I would like to post here but I'm not able to since I'm a new user and not allowed to post links - so you will have to wait till tomorrow...)

Edit by Ian: http://electricalbreakdown.nfshost.com/wordpress/?p=5

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