Designing a Line-Out Amplifier for TRS/phone connector

AI Thread Summary
When designing a line-out amplifier for a TRS/phone connector, key considerations include the appropriate load impedance to present to the phone, typical signal levels, and input/output impedance requirements. It's important to assess whether a DC bias is necessary and to determine the power needed for the connected speakers. Additionally, understanding the implications of using stereo (unbalanced) TRS connectors and cables is crucial for optimal performance. A simple amplifier design should prioritize these factors to ensure effective signal amplification and filtering. Proper attention to these details will enhance the overall functionality of the amplifier.
MisterX
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I have a signal that comes from a computer of phone line-out and I would like to amplify or apply analog filters. I am not sure what considerations I need to make in the design. What type of load should I present to the phone? What are the signal levels? Input or output impedance? Is there a DC bias? How much power do I need to provide to the computer speakers? Are there any other considerations with stereo (unbalance) TRS connectors/cables? I would like to design a simple amplifier first.
 
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