Blink it. Filter it. Figure it out.
Your first pocket-sized playground
Change the timing resistors and capacitor, then watch the LED and waveform respond. Try the one-second challenge, with hints when you need a nudge. No parts to order, no wires to untangle. Just a rhythm you can make your own.
A second playground: smooth the signal
Meet the RC filter bench. Mix a slow signal with fast ripple, tweak two components and watch the difference. Can you keep the useful signal while quieting the ripple? Try the challenge, with wiring, explanations and sources close by.
A blink with an explanation
Explore the 555 with component experiments, phone-friendly wiring, pinouts and manufacturer sources. Understand the why, not just watch the flashing. Over in Learn, the breadboard illustration now has more room on desktop, with its numbered notes neatly below.
Your experiments have a home
Find Playground in your phone’s menu or desktop navigation. Pick the blink bench or the new filter lab, search by component, or choose a topic. The mobile header stays uncluttered, and there’s room for more experiments.