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Audio Amplifiers: Headphone / Earphone Amplifier Electronic...

Earphone Audio Amplifiers

Use one or more of these electronic circuit schematics to amplify the sound in your earphones or headphones. Be sure to match the impedance and not amplify too much so that you don't go deaf(er)!

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This high gain earphones amplifier electronic circuit has a microphone, the sound from which it amplifies by a very high level so you can listen things to with lower volume easily.
Photo: One Watt Audio Amplifier One Watt Audio Amplifier
1 Watt Audio Amplifier. 8 Ohms impedance. 20 Hz to 20 kHz. Small, few components.
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Amplifier circuit for electret microphones (condenser microphones). Amplifier the audio signals picked up by the electret microphone, using 741 op-amp and a 2N2222 transistor.
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This simple stereo audio amplifier will amplify audio for your low-medium impedance headphones and give you left/right balance control