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When you want a exact time, you can use a microcontroller. After all, then all your pals will say “Might have achieved that with a 555!” However the 555 isn’t magic — it makes use of a capacitor and a comparator in numerous configurations to work. Wish to perceive what’s occurring inside? [Mano Arrostita] has a video about simulating delay and timer circuits in LTSpice.
The video isn’t particularly concerning the 555, however it does present how the fundamental circuits inside a timer chip work. The concept is straightforward: a capacitor will cost by a resistor with an exponential curve. When you choose, you’ll be able to cost with a relentless present supply and get a pleasant linear cost.
You’ll be able to watch the voltage because the capacitor prices and when it reaches a sure level, you realize a sure period of time has handed. The discharge works the identical means, in fact.
We like analyzing circuits for studying with a simulator, both LTSpice or one thing like Falstad. It’s simpler than breadboarding and encourages making modifications that might be tougher on an actual breadboard. If you’d like a refresher on LTSpice or present sources, you’ll be able to kill two birds with one stone.
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