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In Reply to: RE: From a practical standpoint... posted by Dynobot on July 15, 2012 at 09:00:49
Function and mechanism are different concepts.
Converting a digital pulse train (current) to an analog signal (voltage) can be done by active or passive components. If the components are active they can be configured as op-amps or in other topologies. Incidentally, there are such things as op-amps made out of vacuum tubes. Back in 1961 I worked with an analog computer that had a few dozen op-amps, all made out of tubes.
Tony Lauck
"Diversity is the law of nature; no two entities in this universe are uniform." - P.R. Sarkar
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Tony Lauck
"Diversity is the law of nature; no two entities in this universe are uniform." - P.R. Sarkar
I think the Havana Dac although advertised as not having opamps used a Dac chip PCM56P that used internal opamps to do the I/V conversion.
Great Dac but not as resolving as some others.
Dynobots Audio
Music is the Bridge between Heaven and Earth - 音楽は天国と地球のかけ橋
The PCM56P has an opamp on the chip but you don't have to use it, you can connect to the current out if you wish.
I have no idea which way the Havanna did it, it can go either way.
John S.
... that an opamp may be an integrated circuit, but not all integrated circuits are opamps. (Rather like "breeds" v. "dogs". All poodles are dogs, but not all dogs are poodles.)
This ia picture of a vacuum tube op-amp from the analog computer that I used in 1961. The link has a complete description of the system and more pictures. As a 17 year old kid, I really enjoyed twirling the 10 turn precision potentiometers. :-)
Tony Lauck
"Diversity is the law of nature; no two entities in this universe are uniform." - P.R. Sarkar
Ohhhh, sure beats the Heathkit one my H.S. Physics room had. You must have had better connections...
Rick
I got paid $1.00 per hour playing with these toys. I thought this was a much better deal than cutting the neighbors' lawns.
Tony Lauck
"Diversity is the law of nature; no two entities in this universe are uniform." - P.R. Sarkar
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Dynobots Audio
Music is the Bridge between Heaven and Earth - 音楽は天国と地球のかけ橋
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