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Great combination to learn about timers, op amps, and optoelectronic circuits. The kit requires soldering. Recommended soldering kit PN: 2132322 (not included)
Toy Organ kit
The Toy Organ project is a music maker based on a simple 555 timer circuit from Forrest's well known Engineer's Mini Notebook, Volume 1: Timer, Op Amp & Optoelectronic Circuits & Projects. With the addition of a resistor, some capacitors and some buttons, you can generate several different tones. Add on a couple potentiometers and you can control the volume and the pitch of a note. Even more, when you press several buttons at the same time, another unique tone is generated.
Timer, Op Amp & Optoelectronic Circuits & Projects book
This Engineer's Mini Notebook features more than two dozen 555 timer circuits that you can build, including three tone generators, LED flashers, sound-effects circuits, and a touch switch. It also includes more than 50 operational amplifier (Op Amp) circuits, many with simple formulas to help you modify them for special circuits of your own design. A wide range of optoelectronic circuits and projects are featured, including many LED circuits and various lightwave communication systems.