Question
- A student wants to use two p-n junction diodes to convert alternating current into direct current. Draw the labelled circuit diagram she would use and explain how it works.
- Give the truth table and circuit symbol for NAND gate.
✓
Answer
Working:
- For +ve half cycle of AC source, let A be at +ve potential and B and ve potential, So, $D_1$ will be forward biased and $D_2$ will be reversed biased. Itmeans currentwill only flow through $D_1$ and current will not flow through $D_2$. Output is obtained across $R_L.$
- For -ve half cylce, B will be at +ve potential and point A at ve potential, So, $D_1$ will be reversed biased and $D_2$ will be forward biased Itmeans that current will only flow through $D_2$ and not through $D_1$, output is obtained across $R_L.$
- Truth Table:
Logic Symbol:
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