Headphone Amplifier Circuit

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.
 
Piter - I have designed headphone amp before, tube and SS and I can help you. There is an easier way to do this than the LM386, which is meant for 8 Ohm phones and small speakers. What is the impedance? What is the required voltage.
 
Back
Top Bottom