Electronics help - 555 monostable timer?

7 replies
Found 23rd Feb 2010
what resistor(s) / capacitor(s) would i need to make it last 3 minutes 20 seconds?

thanks in advance!

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7 Comments

Im not doing ur GCSE Electronics homework for you.

450k
400uF

or 900k 200uF

or 1M ohm 180uf
You get the idea :P
Gives 198 seconds so adjust slightly.

Original Poster

Bigpoppaad;7927743

Im not doing ur GCSE Electronics homework for you.



ive already done it.. i was wondering if you got the same as me i got 1000k and 290 uf capacitor

Original Poster

imafish2002;7927764

450k400uFor 900k 200uFor 1M ohm 180ufYou get the idea :PGives 198 seconds … 450k400uFor 900k 200uFor 1M ohm 180ufYou get the idea :PGives 198 seconds so adjust slightly.



pretty similar to my own, the problem is adding up the resistors etc because school dont have such a wide range
i worked mine out to be 320.1 seconds

sorry it wasmeant to say 5 mins 20

1M + 290uF is 320 seconds give or take

Banned

3 minutes 20 seconds is 200 seconds..... not 320

lets hope you don't end up working for boeing or in the brakes department of toyota....

Original Poster

jubbyme;7928773

3 minutes 20 seconds is 200 seconds..... not 320lets hope you don't end … 3 minutes 20 seconds is 200 seconds..... not 320lets hope you don't end up working for boeing or in the brakes department of toyota....



read above.. i said 5 mins 20
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