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Old 5th October 2005, 10:42 PM   #1
ostie01 is offline ostie01  Canada
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Default Denon POA-2400

Does anybody know what this mean. Optical class A and Optically
controlled bias system.I know what bias is but how it can be controlled
optically.And if someone have the service manual for this amp, will be appreciate.Thanks,
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Old 6th October 2005, 12:55 AM   #2
anatech is offline anatech  Canada
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Hi ostie01,
They used an optocoupler to increase the bias in a range of signal level. Nothing special really. The transistor in the optocoupler is used as a switch and brings in another resistor in the bias network. The same as if you turned the bias pot up, but very quickly.

You know, I never did investigate this but ... I wonder if when it switches, does it put a transient on the output waveform?

-Chris
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