1. I have attempted to build a dual-polarity power supply. However, from the projects that I have found, I don't think I have much uses for it in real life (also the negative rail isn't working all that well as I need to externally connect a dissipating resistor in parallel to discharge the capacitor when I turned off the power). Do you know of a good way to get rid of it in an environmentally friendly way, maybe even recuperating some of the costs of the material, for other enthusiasts' uses?
2. I have also attempted to build a function generator using this site (**broken link removed**). I probably should have bought the kit (although it's not available now), but I have problems getting the circuit working. I also noticed the differences between the current switch configurations (namely the example on the chip's datasheet requiring a FSK input). I have no idea of what would be a good way to generate that FSK input, or how to get this circuit working in general. I may end up buying a function generator off the shelf later, so again, I'm wondering if you know of a good way for me to recuperate as much as I can for the parts for someone who is interested in continuing on.
I thought of craigslist, but I have my doubts about its usefulness to accomplish what I have just mentioned.
Also,
3. I have a breadboard that I have used for a few years, with a fair portion of the contacts unuseable now. I want to get rid of it, but wondering if there is any environmentally friendly way of doing so before resorting to throwing it into the garbage bin.
Thanks in advance.