Re : I/V conversion.Nobody has a response?

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Nelson Pass

Nelson Pass

The one and only
Joined 2001
Paid Member
OK, I take pity on you.

If you are referring to the D1, there is no DC being
fed to the output of the PCM63, however it is
directly coupled to the Source pin of the Mosfet. The
current through the Mosfet goes to the negative
rail through a resistor.

If the Source voltage is not precisely DC, that is not
an issue, as the output of the PCM63 is a current
source having a high impedance, and it can tolerate
some DC at its output.
 
H

HarryHaller

Banned
Joined 2002
PCM 63

No. Disconect PCM 63 the DACs from the mosfets and connect pin 6 to a 100 ohm resistor to ground. It should be at about zero volts. If this so, go back and adjust P4 and P5 to get 0 Volts at source of Q3 and Q6. Also make sure that the supply vlotages to the DACs are at +5V and -5V.
 
Jocko Homo

Jocko Homo

RIP
Joined 2002
Never mind. I'm just still irrate at people asking advice and then telling me what they are doing that they need advice for is right. Thought you were joining their ranks just to annoy me.

Not that it matters.......found some old company records. The first CD player shipped with a transimpedance I/V stage had a build code of 8939.

Jocko
 
Jocko Homo

Jocko Homo

RIP
Joined 2002
Hmmmmm.......Dirty Harry and NAD 3020. Now I see why you sent me there. And I thought JLH was John Lee Hooker.

Schematic looks a lot like a Williamson. Don't know why those Brits have a thing about feedback applied to emitters. Yeah, yeah, I know, you call it current feedback. I need to dig out my books from bootcamp to clarify this. AD844 is current feedback in my book.

Jocko
 
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