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Brando83 .

Joined: 03 Sep 2017 Posts: 3 Location: Berlin, Germany
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Posted: Sun Sep 03, 2017 2:27 pm Post subject: Audio Amplifier Circuit problem |
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Hi, in my first post- need help or advice for designing audio amplifier circuit.
I have to design an audio amplifier circuit. We are told the impedance of the headphones and the minimum voltage they require and also the voltage source. After researching I have found that the LM386N-4 is a popular choice. (According to a datasheet of LM386N-4 - https://www.icrfq.com/part/2377557-LM386N_4.html ). I've seen many circuit diagrams but what I don't understand is how to pick the voltage gain needed for the amplifier.
I originally thought that need to know the input audio signal voltage and when I multiplied that by the gain that would need to give the minimum voltage required by the headphones, but it appears that what matters is the current which I don't get.
And are you able to design such a circuit without knowing about the audio input signal? If you do need to know about it what is it you need to know about it and why?
I would greatly appreciate any help as I am very lost.
Thanks in advance and sorry for my bad English. |
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NickS .


Joined: 14 Jan 2008 Posts: 10254 Location: Nr. Basinggrad, UK
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Brando83 .

Joined: 03 Sep 2017 Posts: 3 Location: Berlin, Germany
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Posted: Sun Sep 03, 2017 7:04 pm Post subject: |
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Hello Nicks,
Thanks a lot, for your reply and sharing a valuable information to me. It might be helpful for me. I had bookmarked this information for my future.
No, I didn't calculate the output voltage but as my research maybe it would be 9V. Let you know my update very soon.
Kind Regards |
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