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Old 19th April 2013, 06:45 PM   #1
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Thumbs up Quad 405 amplifier

Does anyone know why capacitor C10 was changed from 47uf to 100uf.
Regards, Carbotec.
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Old 19th April 2013, 06:56 PM   #2
Mooly is online now Mooly  United Kingdom
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C10 looks to be a "bootstrap" so increasing its value will increase (or rather maintain) its effect at lower frequencies. It enables the output to swing that little bit closer to the rails so raising the maximum output voltage swing available. It probably also lowers the absolute distortion figure. The change will only affect the lowest frequencies though.
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Old 19th April 2013, 07:42 PM   #3
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Thanks Mooly. I have modified my 405 and couldn't find a note anywhere as to the reason for change. Regards, Carbotec.
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