The headphones are amplifying their heartbeat and the slides are moving one after another for a few seconds each slide and they're listening to their heartbeat.
2
以电子管微变等效电路分析为基础，设计了一款以驱动高保真耳机为目的的耳机放大器。
Based on the analysis of vacuum tube slight variation equivalent circuit, a headphone amplifier is designed to drive high fidelity headphone.
3
减少外在组分要求，因为没有需要分开的话筒或耳机放大器，并且盖帽联系可以与所有装载建立。
External component requirements are reduced as no separate microphone or headphone amplifiers are required, and Cap-less connections can be made to all loads.
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