Piterson88
New Member
Hi,
Need help or advice for designing headphone amplifier circuit.
I have to design a headphone 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.
I would greatly appreciate any help as I am very lost.
Thanks.
Need help or advice for designing headphone amplifier circuit.
I have to design a headphone 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.
I would greatly appreciate any help as I am very lost.
Thanks.