Timer by dkristal

117

02:16:51

Timer to ON or to OFF. Time depends on the capacity of the capacitor and the position of the potentiometer. With C = 100uF and R = 1 M time is about 2 min (real time)

published 8 years ago

hurz

8 years ago

1Meg and 100uF is about 69.3s, so a bit more then a minute. To get 2 minutes you need 100uF and 1.73MegOhm. If you are interested in, how to calculate this, let me know.

dkristal

8 years ago

@hurz I calculate a voltage drop from 5 to 2 volts with a result of 91 sec ... Exact result will come after implementation ... so I wrote 'about'

hurz

8 years ago

Why 5 to 2V?

dkristal

8 years ago

https://learn.sparkfun.com/tutorials/logic-levels#ttl-logic-levels

hurz

8 years ago

These voltages are for TTL gates and for Arduino CMOS input ports. So nothing everycircuit has. Everycircuit gates do not have a grey undefined voltage range between HIGH and LOW. 0V to supply/2 is LOW and supply/2 to supply is HIGH. If you use TTL devices, it can be adapted within EveryCircuit.

hurz

8 years ago

Are you still implement this circuit? May I remind you what you said:"...Exact result will come after implementation..."

hurz

8 years ago

Here "dkristal" even moved into the headline. Wow, dkristal must be expensive stuff.

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