Quick questions on Timing circuits and oscillators: 555 astable and monostable - WJEC A-Level Electronics

2short 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 key difference between a monostable and an astable circuit. [2 marks]

What is q2?

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A 555 astable has

R_1 = 1.0\,\text{k}\Omega

R_2 = 1.0\,\text{k}\Omega

and

C = 470\,\text{nF}

. Estimate its period using

T = 0.7(R_1 + 2R_2)C

. [2 marks]

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