Well, a virt gnd input is exactly what a transimpedance amp is supposed to present.
Hans
The problem with the testers is, that they have precious little time for a review.
In the old days Audio had at least 30 employees to produce the magazine.
Now there are maybe only 5 people and freelancers.
The Art of good testing is mostly lost and forgotten nowerdays.
In the old days Audio had at least 30 employees to produce the magazine.
Now there are maybe only 5 people and freelancers.
The Art of good testing is mostly lost and forgotten nowerdays.
Jan, I have to read my own article again but the idea for such a stage is not new.
In the old times we called it Dolphin.
Hesener made a Layout years ago.
In the old times we called it Dolphin.
Hesener made a Layout years ago.
True ! Diagram 11683 only shows the idea to parallel Opamps at the input for less voltage noise.
That idea is not new. See Elektor Supra 2.
I have not seen that in a transimpedance stage though.
The Dolfin as such is much more complicated or should i say sofisticated.
That idea is not new. See Elektor Supra 2.
I have not seen that in a transimpedance stage though.
The Dolfin as such is much more complicated or should i say sofisticated.
Jan, in the Rabbit Hole article i paralled the opamps out of another reason.
4 times the current drive compared to a single opamp to drive the low impedance feedback network without overload.
Later it showed that i build a much too heavy german tank.
One opamp per side works as well because of the miniscule signal at that point.
4 times the current drive compared to a single opamp to drive the low impedance feedback network without overload.
Later it showed that i build a much too heavy german tank.
One opamp per side works as well because of the miniscule signal at that point.
Here is a Dolphin for sale from € 1613,77 for € 68,00 😀
Ruffel Price Hike Dolphin Mm Mc Phono Amplifier Movement Ruffel Price Hike Dolphin Mm Mc Phono Amplifier Movement [224554934607] - €68.00 -
Hans
Ruffel Price Hike Dolphin Mm Mc Phono Amplifier Movement Ruffel Price Hike Dolphin Mm Mc Phono Amplifier Movement [224554934607] - €68.00 -
Hans
Waning, Hans are you joking ? This is a fraudulent website.
The "offer" is created by your search using old Ebay etc ads.
The "offer" is created by your search using old Ebay etc ads.
Please explain why you consider this a "balanced transimpedace phonostage"
(11677, 11678).
With a resonance of 6.7Hz, I'd employ a Sallen-Key filter (thanks to Rod Elliot) to the RIAA preamp outputs to eliminate anything below 18-20Hz.
I've installed them on my various TT setups with excellent results.
No more airborne feedback issues at high volume, no rumble worries, and you don't even miss the woofer-pumping of a warped record, it's gone.
With those issues solved, the amp's power can concentrate on the music.
Project 99 - Infrasonic Filter