Guys,
My last post was censored..............for your information I had joked with Mr.Curl about the name I had used for a proposed new project. I was not taking a shot at him.
Jam
My last post was censored..............for your information I had joked with Mr.Curl about the name I had used for a proposed new project. I was not taking a shot at him.
Jam
Hi,
For to build a symmetrical feeding (+ and -Vcc), I wonder if it is preferable to use 2 positive regulators as LM317 or one LM317 for the positive rail and its negative equivalent as LM337 for the negative rail. Benchmarkses of these 2 regulatiors being slightly different.
Does someone have you it makes comparisons to monitoring?
Darry
For to build a symmetrical feeding (+ and -Vcc), I wonder if it is preferable to use 2 positive regulators as LM317 or one LM317 for the positive rail and its negative equivalent as LM337 for the negative rail. Benchmarkses of these 2 regulatiors being slightly different.
Does someone have you it makes comparisons to monitoring?
Darry
john curl said:
John,
I am assuming you didn't use a follower on the OP?
If this is the case, may I ask what is the reason?
Cheers,
Terry
John,
first I want to thank you for your input regarding relays and the contact pressure thing etc., it's obvious it's really up to the finest details in your design!
As Terry I wondered myself a bit regarding the output resistance, my Q's is why did you guys chose 1000 Ohm?
My guess is that you have a quite low output impedance on the (current/voltage?)amplifying OP stage with a fixed 1000 Ohm resistor which is much more independent by frequency etc..
Cheers Michael
first I want to thank you for your input regarding relays and the contact pressure thing etc., it's obvious it's really up to the finest details in your design!
As Terry I wondered myself a bit regarding the output resistance, my Q's is why did you guys chose 1000 Ohm?
My guess is that you have a quite low output impedance on the (current/voltage?)amplifying OP stage with a fixed 1000 Ohm resistor which is much more independent by frequency etc..
Cheers Michael
The CTC preamp is a transconductance amp that is current output. 1K ohm was the lowest value that we could use and still get reasonable distortion at a few volts out. There are no followers in this preamp. This was also true in the Levinson JC-2, JC-80, and some other line preamps that I have designed. I do use complementary fet followers in the Parasound JC-2.
Save yourself the trouble, John.
The rest of us know what you mean, anyway.
Why anyone would waste time on such a daft 'challenge', I'll never know!
Regards,
The rest of us know what you mean, anyway.
Why anyone would waste time on such a daft 'challenge', I'll never know!
Regards,
Bobken said:
Yes...I can't understand why some people try to make audio discussions , without knowing basic concepts , as amplifiers types ...
Broadly speaking, you might say it's a current source, as opposed to a voltage source. Both obey Ohm's law, but the implications are different.
Grey
Grey
john curl said:
Oh I see, that was unexpected, but the 1 kOhm fixed resistor was there anyhow.
What is the advantage to use a transconductance stage instead of the common voltage amplifier as a preamp?
Cheers Michael
What's so strange with a transconductance guys, the 1 kOhm shunt resistor gives it a fixed gain but it depends also on the input impedance of the amplifier? 🙂
Cheers Michael
Cheers Michael
Ultima Thule said:
Yep...for the same reason , transconductance amplifiers are not disturbed by a short at the output, unlike a voltage or a transresistance amplifier..
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