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Author Question: Which formula is correct when calculating time HIGH (tHI) for an astable 555 timer output? A) tHI ... (Read 97 times)

anshika

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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

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Reply #1 on: Jul 28, 2018
Answer to Question 1

D

Answer to Question 2

C


anshika

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Reply #2 on: Jul 28, 2018
Thank you!


ergserg

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Reply #3 on: Jul 28, 2018
Always glad to help...


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