www.ebay.com.au/itm/111146886421I bought one of these, mainly because its cheap cheap!
99% of my use for it, is just for testing audio stuff, so the frequency range is more than enough.
Build quality is really nice, especially for a low volume, cheap, Chinese item :p
Even the hand soldering is neat and clean!
And onto the question... does anyone have a schematic for this?
I'm wanting to modify it, so it has a built in rechargeable battery, that I can charge using the usb cable it came with. (its either going to be a tight fit, or a low capacity)
I'm also wondering what the "filter" button does?
PICS!