Has anyone got a simple circuit for a keyboard?

Question

Only the circuit, not the case. A list of components is also good.
(skematic symbols as well, if available).
Links and pics wanted please!

A musical keyboard

Answer 1

I hope you mean regular PC keyboard, say, with PS/2 style plug? Or do you mean MUSIC keyboard?

A regular PC keyboard actually has a tiny CPU inside in order to generate the scan codes read by the PC itself. It is not as simple as just wiring up a set of 100+ switches.

As for music keyboard, that's even MORE complicated!

And neither is exactly "consumer electronics"!

Perhaps if you clarify your question you'll get a better answer.