Quick questions on The 555 timer: astable and monostable timing circuits - Eduqas A-Level Electronics

3short Q&A pairs drawn directly from our worked dot-point answer. For full context and worked exam questions, read the parent dot-point page.

What is q1?

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State the equation for the output frequency of a 555 astable. [1 mark]

What is q2?

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A 555 monostable has

R = 100\ \text{k}\Omega

and

C = 10\ \mu\text{F}

. Find the output pulse duration. [2 marks]

What is q3?

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State why a crystal oscillator is used instead of a 555 for a microcontroller clock. [1 mark]

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