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Temporizador variable 555
1.
Adjustable 1-10 Minute
Timer Project The circuit starts timing when switched on. The green LED lights to show that timing is in progress. When the time period is over the green LED turns off, the red LED turns on and the bleeper sounds. The time period is set by adjusting the variable resistor and it can be adjusted from 1 to about 10 minutes. Please note that the range of time periods is only approximate. With perfect components the maximum time period should be 4½ minutes, but this is typically extended to about 10 minutes because the 220µF timing capacitor slowly leaks charge. This is a problem with all electrolytic capacitors, but some leak more than others. In addition the actual value of electrolytic capacitors can vary by as much as ±30% of their rated value. Parts Required • resistors: 470, 33k, 100k • 555 timer IC • variable resistor: 1M • 8-pin DIL socket for IC • capacitors: 0.1µF, 220µF 16V radial • on/off switch • LEDs: red, green • battery clip for 9V PP3 • bleeper 9-12V • stripboard 10 rows × 22 holes Stripboard Layout 470 0.1µF 220µF 33k 1M potentiometer On/Off Switch red black red Set time period black red 9-12V Bleeper Battery Snap red red 4 tracks to cut under chip holder, shown Red LED long lead is + 100k Green LED Circuit diagram 2 6 7 1 3 4 8 470 Green LED Bleeper 555 timer 33k 100k 1M 0.1µF220µF 9V Red LED Electronics Club © John Hewes 2013 electronicsclub.info
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