Driving requirement of a typical ear phone of small walkman or IPOT

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To create a simple battery amplifier circuit for a guitar to drive headphones, understanding the typical input impedance and voltage is crucial. Most headphones fall into two categories: high impedance (around 600 ohms) and low impedance (typically 30 to 100 ohms, with 50 ohms being common). Low impedance headphones are preferred for their louder output at the same voltage level. A standard op-amp may not suffice for driving these headphones effectively, indicating the need for a more robust solution. The discussion emphasizes the importance of matching the amplifier to the headphone's impedance for optimal performance.
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I want to make a quick and simplest little battery amplifier circuit to amplifier the guitar to drive a headphone of a walkman or IPOT type where people wear to do workout or walking. What is the typical input impedance and input voltage.

I don't need high quality sound, just amplifier the signal of about 1mV to 2mV. Can I typical op-amp be used?

Thanks
 
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Most headphones are one of two types.

"High impedance" phones have a standard impedance of 600 ohms. "Low impedance" phones are usually around 50 ohms, but could be anything between say 30 and 100.

Cheap headphones tend to be low impedance, because they "sound louder" driven from the same voltage level.
 
Thanks for the reply. Sounds like I need more than a common op-amp to drive it.
 

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