Which of the following statements is true regarding the use of a transformer with a 7805 regulator? A) A transformer with a peak secondary voltage below 9 V is acceptable. B) The v... Which of the following statements is true regarding the use of a transformer with a 7805 regulator? A) A transformer with a peak secondary voltage below 9 V is acceptable. B) The voltage can be less than 9 V if no load is applied. C) Heat sinking is not necessary if the transformer is rated at 12.6 V. D) The transformer must always provide 12.6 V.
Understand the Problem
The question is asking which statement among the provided options is accurate concerning the use of a transformer with a 7805 voltage regulator. It implies that we need to evaluate the characteristics of transformers and how they interact with the 7805 regulator's operational requirements.
Answer
The transformer must always provide 12.6 V.
The transformer must always provide 12.6 V.
Answer for screen readers
The transformer must always provide 12.6 V.
More Information
For a 7805 voltage regulator, the input voltage must be higher than 7V to ensure proper regulation. Around 12V is ideal to provide sufficient headroom for regulation and account for any voltage drop.
Tips
A common mistake is using an input voltage too close to 7V, which might not provide enough headroom for the regulator to maintain a steady 5V output under load.
Sources
- Selecting input voltage for 7805 - Electronics Stack Exchange - electronics.stackexchange.com
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