stinkbutt wrote:I'm not really of the opinion that you should have circuits that do anything too terribly useful for a learning kit. It's for learning. While it'd be great to make youself something useful, that kind of goes against the grain of feeling free to break stuff, no?
I was hoping someone would say that..
stinkbutt wrote:Anyway, if you ask me, I'd ask for a bunch of stupid-cheap stuff. Gimme a trio (monostable, bistable, and astable) of 555 circuits. The former two would probably need a few momentary switches to activate them. Then give me a couple of sinusoidal astable oscillators.
I have piles (albeit small ones) of such things:
Those are square wave oscillators in 1Hz, 10Hz, and 100Hz. Two resistors, one cap, one LED, a Schmitt inverter, and a buffer. Total parts cost, about 25c.
I have fixed-value current and voltage sources, fixed-frequency sine wave oscillators, arrays of LEDs driven by mosfets (because I always
end up wanting a few LEDs somewhere and 'high impedance input, just plug it in anywhere' is nice), switch debouncers, one-shots, on/off toggles, etc.
They're all little things I've found myself wanting while building and testing larger circuits. They aren't exciting in their own right, but they're cheap, handy, and good SMT soldering practice.
If there's enough interest to warrant a run of PCBs and catch the attention of a really high-class Open Hardware distributor (hint, hint ;-)), I'd be happy to make some kits with enough boards and parts for, say, five variants of the same basic circuit, plus a few extra parts for 'learning experiences'.
When you void a product warranty, you give up your right to sue the manufacturer if something goes wrong and accept full responsibility for whatever happens next. And then you truly own the product.