Temporizzatore automatico

122

01:19:06

It's a timer. 
The ne555 is used in the astable mode. It generates a pulse which close the relay contacts. The duration of the half-wave high is Th = 0,7C R (green); the duration of the negative half-wave is Tl = 0,7C R (orange). The diode serves to have a duty cycle less than 50%

published 8 years ago

hurz

8 years ago

You should Insert some base current limiting resistor to not burn the transistor to quickly http://everycircuit.com/circuit/5620811559075840

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