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Wednesday, March 22, 2017
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Headphone attenuator
A miniature surface-mount voltage divider for sensitive in-ear headphones. Without attenuation these devices can easily produce 130+ dBu SPL at full volume; loud enough to damage hearing in seconds.
Wiring this circuit into a pair of headphones (or an adapter) will reliably limit the maximum level produced.
It's tiny at 0.2 x 0.27 inches and mounts four 0805 (imperial) resistors, two per channel. The circuit below uses 20 ohms for R1,R4 and 0.2 ohms for R2,R3 which results in 40 dB of attenuation.
Wiring this circuit into a pair of headphones (or an adapter) will reliably limit the maximum level produced.
It's tiny at 0.2 x 0.27 inches and mounts four 0805 (imperial) resistors, two per channel. The circuit below uses 20 ohms for R1,R4 and 0.2 ohms for R2,R3 which results in 40 dB of attenuation.
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