Optimos Question - Circuit

1965GTO · 15th September 2010, 09:57 PM

In this ciruit for the Optimos Amplifier there is two listed as "Opt 1 , DC Option" and Opt 2, DC Option. Can anyone expand as to what these "options" are for? I have circled in red.

djk · 16th September 2010, 01:29 AM

You have a choice of back-to-back electrolytics, a single non-polar electrolytic, or no cap (a jumper).

The diode protects the cap in the feedback loop from high reverse voltages.

In amplifiers like the Adcom GFA555 and the Leach, no input cap is used. There is a cap in the feedback loop.

lineup · 16th September 2010, 06:27 AM

If you short OPT1 and/or OPT2 with a jumper
then you should be careful to measure DC-Offset at output.
Because this is what will happen.

16th September 2010, 01:29 AM	#2
djk diyAudio Member Join Date: Feb 2001 Location: USA	You have a choice of back-to-back electrolytics, a single non-polar electrolytic, or no cap (a jumper). The diode protects the cap in the feedback loop from high reverse voltages. In amplifiers like the Adcom GFA555 and the Leach, no input cap is used. There is a cap in the feedback loop. __________________ Candidates for the Darwin Award should not read this author.

16th September 2010, 06:27 AM	#3
lineup diyAudio Member Join Date: Dec 2005 Location: the north	If you short OPT1 and/or OPT2 with a jumper then you should be careful to measure DC-Offset at output. Because this is what will happen. __________________ lineup

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