I purchased a DIY op-amp kit from eBay. The parts arrived in a baggy, I soldered it all together, but have no idea how to wire the power supply?
I am hoping to use 9V batteries, and realize I might have to run two or more in series? I am pretty new to this electronics thing.
What is confusing me is that the hookup has "VDD", "-GRD-", and "-VCC". I have no idea what connects to what in terms of batteries, etc.
I have attached several photos with the amp, chips, etc. It did not come with instructions, datasheets, etc.