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Analogue Source Turntables, Tonearms, Cartridges, Phono Stages, Tuners, Tape Recorders, etc.

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Old 16th January 2012, 11:39 PM   #4461
FdW is offline FdW  Netherlands
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Quote:
Originally Posted by Joachim Gerhard View Post
Not necessary, your Hexfred´s have around 35nsec recovery, i use them too sometimes, the QSpeeds are under 10nsec.
A Schotky has a low forward drop but not better recovery. The recovery can even be more sharp. They also have some leakage.
What we need is fast and soft recovery for little EMF.
I would prefer soft recovery over low drop, both would be nice, but loosing 1V is not very important to me.
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Old 17th January 2012, 12:19 AM   #4462
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Originally Posted by Joachim Gerhard View Post
Here is my motor noise snubber.
This looks like my yesterday dinner

I bet the taste, eehhhmmm the sound is terrific

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Old 17th January 2012, 12:27 AM   #4463
MiiB is offline MiiB  Denmark
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http://www.vishay.com/docs/94060/hfa16tb1.pdf

could be a good diode..
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Old 17th January 2012, 12:52 AM   #4464
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good! not the price 9.37€
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Old 17th January 2012, 02:04 AM   #4465
Salas is offline Salas  Greece
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I use those in my tube amp for its B+. They are good parts.
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Old 17th January 2012, 03:16 AM   #4466
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Funny, i use them too. Also the bigger 25A version.
Here is my Bakers 5.
UF4004 is the second one from the left.
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File Type: jpg Collection of Diodes.jpg (82.9 KB, 274 views)
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Old 17th January 2012, 03:24 AM   #4467
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Audiofanatic, this is actually a full functioning MC phono stage with an inductive input.
I build that for ETF2011.
It makes the 75usec with the inductance of the cartridge plus the input inductor. The inductor has 4 tabs for different cartridges. By coincidence i found out that i could hear the motor of my turntable in the speakers when i put the input coils near my turntable. I left in the RIIA instead of a linear amp because then i get gain in the bass.
When i use it for listening i put the coil in a Mumetall container.
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Old 17th January 2012, 04:56 AM   #4468
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Maybe we should use point contact diodes.
They drop only 0.2V and have superb high frequency characteristics. Junction diodes : SOLID-STATE DEVICE THEORY
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Old 17th January 2012, 05:23 AM   #4469
GaryB is offline GaryB  United States
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I've had good success with Fairchild Stealth soft recovery diodes. For example, these have worked very well for me in various preamps that I've built.

http://www.fairchildsemi.com/ds/IS/ISL9R460PF2.pdf

And they're not too expensive - $0.75 each at Mouser.

If low drop out voltage is needed then one doesn't need to go to a point contact diode. One can get schottky diodes with very low voltage drop - it's basically the same mechanism as a point contact, with the turn on voltage set by the work function of the metal contact vs. silicon. These diodes have Vf ~ 0.3v which isn't too bad.
http://www.diodes.com/datasheets/ds30492.pdf

---Gary
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Old 17th January 2012, 08:41 AM   #4470
hesener is offline hesener  Germany
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Originally Posted by Joachim Gerhard View Post
And high temperature use.
are you planning to use your power supply at 300°C? ;-)
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