4 ms·
How do you get such a wide range of times with such a tiny capacitor? I imagine there is some magic with multiplying this effect across multiple caps?
by altcognito 5y ago
How do you get such a wide range of times with such a tiny capacitor? I imagine there is some magic with multiplying this effect across multiple caps?
- kens 5y agoFor a short delay, you use a small resistor and a small capacitor. For a long delay, you use a large resistor and a large capacitor. The result is that it supports "timing from microseconds through hours." The timing resistors and capacitors are external, so you can select whatever values you want for your application.
- bonzini 5y agoIt's not necessarily tiny. You could use an electrolytic capacitor with a capacity of a few millifarads, for example. However, the tolerance of larger capacitors is larger (usually 20%, and up to 50%) so that quickly becomes expensive. It's more likely that you'll generate a 10 second or less pulse with the 555 and then make it longer using (for example) T flip-flops. A single 744040 ripple counter IC for example can divide the output by up to 4096.