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The high octane phono preamp
The high octane phono preamp
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Old 17th December 2013, 03:02 PM   #21
iko is offline iko  Canada
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The high octane phono preamp
The power mosfet, in the shunt reg.
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Old 17th December 2013, 03:03 PM   #22
abraxalito is online now abraxalito  United Kingdom
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He's referring to the power MOSFET in the shunt - it has 50 amp capability. I tend to agree - 1.3nF of gate capacitance, it must be possible to find something a little more nimble right?
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Old 17th December 2013, 03:23 PM   #23
iko is offline iko  Canada
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On the one hand a very high speed opamp is chosen, on the other, that mosfet. My feeling is... pay close attention to layout/construction unless you want an FM transmitter. No disrespect meant, just a very minor point.
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Old 17th December 2013, 03:27 PM   #24
jacco vermeulen is offline jacco vermeulen  Netherlands
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FQPF20N06, likely even cheaper.
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Old 17th December 2013, 05:36 PM   #25
jan.didden is offline jan.didden  Europe
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Yes I was going to ask the same question.

jan
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Old 20th December 2013, 08:30 AM   #26
h_a is offline h_a  Europe
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The mosfets was merely chosen to be similar to what Ovidiu used in in his regulator, at least in the version I used as start for my variant. Of course feel free to use whatever mosfet you'll find suitable. Just keep an eye on its power dissipation, a not too small package helps here.

@SY - thanks for your kind words as well! It's still busy here, so let's see after the holidays what we can do about boards
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Old 20th December 2013, 09:48 AM   #27
atupi is offline atupi  Romania
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Is this preamp designed for MM ?
Any idea from where can buy DN2540 and 2SC2547 preferably Europe ?
For input cart adapt i would film over ceramics, what do you think ?

Regards,
Adrian
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Old 20th December 2013, 10:06 AM   #28
merlin el mago is offline merlin el mago
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DN2540 in ebay UK 2 x Supertex DN2540N5 DN2540 Depletion Mosfet DIY CCS | eBay
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Old 22nd December 2013, 08:53 AM   #29
h_a is offline h_a  Europe
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Hi Adrian,

yes, this pre is for MM and for rather high output MCs. Alternatively, one can pair it with a nice step-up transformer (Cinemag, Lundahl...) and has a cute little MC-phono pre.

I'm sorry to say I just discovered that my original source of 2SC2547 does not have them anymore. That's a pity as I like that part!

C0G/NP0 ceramics are at least as good as good film caps, but you can certainly use also pp caps if you prefer. However, the mentioned ceramics are easier to get in the needed values.

Hannes

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Is this preamp designed for MM ?
Any idea from where can buy DN2540 and 2SC2547 preferably Europe ?
For input cart adapt i would film over ceramics, what do you think ?
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Old 22nd December 2013, 09:21 AM   #30
jan.didden is offline jan.didden  Europe
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I'm using it with a 1:8 step-up with an Ortofon Salsa MC, and it sounds fine.

Jan
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