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Design a circuit to keep LED 'ON' for 20 seconds one circuit is triggered.
written 7.9 years ago by gravatar for teamques10 teamques10 ★ 65k •   modified 4.0 years ago
linear integrated circuits
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written 7.9 years ago by gravatar for teamques10 teamques10 ★ 65k

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Step 1: Selecting R

Since the above problem requirement suits for monostable multivibrator. To obtain 20 seconds delay to keep LED on we need to adjust the values of RA and C which is obtained from following equation, $$T_b = 1.1R_AC$$ Given data :

$T_b$ = 20 seconds

Assume C=1µf …

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