I'm working on connecting my Pi to a Sainsmart relay board using Xmass. This kit was perfect for prototyping. The transistors (pn2222) were spot on and the resistors and leds work fine with the kit. I haven't used a small power supply with it, but I've seen it come in handy, especially with a power switch. My only complaint was that I needed three more transistors to complete the build.
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