If you are interested to build a Moving Coil RIAA Preamplifier, you could find a good one in my article published in audioxpress, March 2014.
The article has been posted also on-line here:
The MC100 - A High-Quality Moving Coil RIAA Preamplifier | audioXpress
The article has been posted also on-line here:
The MC100 - A High-Quality Moving Coil RIAA Preamplifier | audioXpress
Hi,
AD797 wouldn´t have been my choice throughout the amp.
The gnd routing certainly looks done like ...."well, everything is routed ... now lets´s pour a gnd plane all over the place".
The gnd layout/routing is extremely important for lowlevel signal design.
Only a good layout will allow to press all the juice from the circuit.
A bad layout can ruin the specs, lead to hum and more nasty things.
Not too many coupling caps for my taste though ;-)
jauu
Calvin
AD797 wouldn´t have been my choice throughout the amp.
The gnd routing certainly looks done like ...."well, everything is routed ... now lets´s pour a gnd plane all over the place".
The gnd layout/routing is extremely important for lowlevel signal design.
Only a good layout will allow to press all the juice from the circuit.
A bad layout can ruin the specs, lead to hum and more nasty things.
Not too many coupling caps for my taste though ;-)
jauu
Calvin
I used the AD797 because I like its sound.
Of course you can use whatever other opamp you like, although I think for position IC5 you will hardly find another so good op-amp.
The layout / routing / ground plane is very carefully designed and not as you described.
I know very well the importance of this for low level signal design.
The preamplifier is completely quiet without any hum or other noises.
For the coupling capacitos, what can I say? This is a very old discussion. We can continue the discussion for days (...or years). Anyway, I used polypropylene capacitors of high quality except for the output capacitor which as I described in the article, I have not use it.
Of course you can use whatever other opamp you like, although I think for position IC5 you will hardly find another so good op-amp.
The layout / routing / ground plane is very carefully designed and not as you described.
I know very well the importance of this for low level signal design.
The preamplifier is completely quiet without any hum or other noises.
For the coupling capacitos, what can I say? This is a very old discussion. We can continue the discussion for days (...or years). Anyway, I used polypropylene capacitors of high quality except for the output capacitor which as I described in the article, I have not use it.
Matti Pussinen who lives in Finland build my MC pre-amplifier and was very pleased to send me the following:
"It is very fast, colourful and powerful, but not painting anything. So I think it is the best one. Much information in different places I heard now.
And on the other hand, I heard which vinyls are not well pressed.."
He also send me some photos of the pre-amplifier.
"It is very fast, colourful and powerful, but not painting anything. So I think it is the best one. Much information in different places I heard now.
And on the other hand, I heard which vinyls are not well pressed.."
He also send me some photos of the pre-amplifier.
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