Whenever I use the 555 timer, it seems that the output polarity is invariably ... parameter is sloppy (-1 to -5V), the device must be selected—to the left is a simple test circuit—actually, most ...

Figure 1 An astable 555 timer circuit based on an inductor ... Table 1 Formulas to predict timing characteristics. To test these ideas, we prepared a spreadsheet calculator that predicts TH, TL, and ...

[FightCube] wrote in recommending a very helpful piece of circuit simulation software for those of you still constructing entries for the 555 design contest. LTSpiceIV, available from Linear ...

Life is analog and there are places where a cheap 555 might do the trick for a little one-off test box ... to make a 555 timer can help you learn many different circuit principles.

If you want to test drive your newly constructed detector but don’t have an IR source within reach, the next circuit should help you out. It too implements a 555 timer IC, but instead of driving ...

This pulse is sufficiently long to trigger the 555 timer once. Thus, the timer is protected against retriggering from the same input pulse. Note, however, that this circuit works only with a ...

Each of the candle lighting circuits, however, use a 555 timer both for its intended purpose of providing a timed power-on reset pulse, and another 555 is used as a simple flip-flop. It’s a ...