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 $\text{NAND}$ 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 $R_L$.
- This process is called full wave rectification and the device is called full wave rectifier.
- Truth Table:
Logic Symbol:
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