[Answered] Which formula is correct when calculating time HIGH (tHI) for an astable 555 timer output? A) tHI ...

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Author Question: Which formula is correct when calculating time HIGH (tHI) for an astable 555 timer output? A) tHI ... (Read 103 times)

anshika

Hero Member
Posts: 510

on: Jul 28, 2018

Which formula is correct when calculating time HIGH (tHI) for an astable 555 timer output?

A) tHI = RBC(.693 ) B) tHI = RARB(.693)
C) tHI = RA(.693 ) D) tHI = (RA + RB) C(.693)

Question 2

A 555 timer in astable operation uses two timing resistors, RA and RB. Which one is used to calculate time HIGH (tHI)?

A) RA B) RB C) both RA and RB D) neither RA nor RB

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ergserg

Sr. Member
Posts: 338

Reply #1 on: Jul 28, 2018

Answer to Question 1

D

Answer to Question 2

C

anshika

Hero Member
Posts: 510

Reply #2 on: Jul 28, 2018

Thank you!

ergserg

Sr. Member
Posts: 338

Reply #3 on: Jul 28, 2018

Always glad to help...

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