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Author Topic: MM MC phono preamp  (Read 2305 times)

Rudi

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MM MC phono preamp
« on: September 06, 2010, 04:12:03 pm »
So I decided to venture into the TT arena, but to do so you need a pretty decent TT and Phono stage. not to mention all the LP's

so I got myself a REGA planar 2, RB200 arm (all this will be stripped and rebuild to a much higher spec)

then for the phono I had to come up with a decent phono stage. I used this stage for the MC step-up
http://www.designfactory.co.za/sound/AD797preamp.pdf

MM is a Rod Elliot design. (from experience he isn't to bad when designing something) so I went with his project 06
http://sound.westhost.com/project06.htm

just to stir matters even more I have chosen the LM4562 as the opamp of choice
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Rudi

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Re: MM MC phono preamp
« Reply #1 on: September 06, 2010, 04:16:00 pm »
here is the layout.

the power supply has proved itself with other of my designs and is very low impedance.
the LM4526 is a ultra quiet op-amp with fantastic PSRR
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Rudi

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Re: MM MC phono preamp
« Reply #2 on: September 06, 2010, 04:17:47 pm »
actual size

101mm x 180mm it is meant to fit into the same profile enclosure as the gerdac.

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Crankshaft

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Re: MM MC phono preamp
« Reply #3 on: September 06, 2010, 04:22:08 pm »
Hi Rudi

I'll be following this thread, as I may be looking for a phono stage sometime soon.
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Rudi

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Re: MM MC phono preamp
« Reply #4 on: September 07, 2010, 08:46:38 am »
first 6 boards are ordered. not doing anything fancy with it just a naked board to keep the cost down.
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Rudi

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Re: MM MC phono preamp
« Reply #5 on: September 11, 2010, 08:51:31 am »
did some very quick building yesterday when the boards arrived. should be able to finish today to test it out

« Last Edit: September 11, 2010, 08:58:37 am by Rudi »
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handsome

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Re: MM MC phono preamp
« Reply #6 on: September 11, 2010, 10:29:26 am »
would you post the schematic of the PSU?
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Rudi

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Re: MM MC phono preamp
« Reply #7 on: September 11, 2010, 12:36:46 pm »
sorry there is no schematic for that. it is a simple double regulated power supply. I never bothered to to draw it up
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chipwelder

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Re: MM MC phono preamp
« Reply #8 on: September 11, 2010, 08:28:22 pm »
Looks nice!
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Rudi

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Re: MM MC phono preamp
« Reply #9 on: September 11, 2010, 10:00:23 pm »
thanks,  ;D sounds nice to. everything worked out fantastic. no tweaks required. it just all came together beautifully

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ghostinthemachine

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Re: MM MC phono preamp
« Reply #10 on: September 12, 2010, 12:04:08 pm »
Nice build!

Just a concern - are your mains inlet lines fused on the device? Remember, safety first!
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Rudi

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Re: MM MC phono preamp
« Reply #11 on: September 12, 2010, 06:21:29 pm »
thanks GITM

inline fuse on the plug. this is always part of my prototyping setup. just much quicker to implement and rip apart if i need to.
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Hi-Phibian

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Re: MM MC phono preamp
« Reply #12 on: September 12, 2010, 07:30:18 pm »
Fuses strangle sonics.
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Family_Dog

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Re: MM MC phono preamp
« Reply #13 on: September 12, 2010, 08:44:37 pm »
...but save equipment and possible fires! I will always use fuses in my equipment, the so-called sonic difference is minimal and completely inaudible.

Last week a mate of mine's house burnt down while the family were in bed. They suspect a computer power supply was the cause.


-F_D
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Hi-Phibian

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Re: MM MC phono preamp
« Reply #14 on: September 12, 2010, 08:53:23 pm »
Never suggested bypassing the fuse, sadly, it is audible to me.
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