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Old 28th December 2011, 11:51 PM   #7091
Salas is offline Salas  Greece
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Quote:
Originally Posted by Bksabath View Post
Say one side swing to + 1V other sving to -1 =2V duble of one single
duble voltagge = 3 dB
Double the voltage=+6dB. Power is Log10, voltage is Log20. Two same amps add 3dB of noise because their self noise is non correlated due to its random nature. So its a net 3dB dynamic range increase if not judged on equal nominal level with SE. Correlated noise is tending to cancel out depending on CMRR. That is what balanced is for.
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Old 29th December 2011, 04:21 PM   #7092
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Tanks Salas
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Old 29th December 2011, 05:36 PM   #7093
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Old 29th December 2011, 09:15 PM   #7094
Salas is offline Salas  Greece
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Quote:
Originally Posted by Bksabath View Post
Tanks Salas
What happened with your build by the way? Finished with your regs?
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Old 29th December 2011, 09:34 PM   #7095
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Hi Sallas.

I had the plesure of many hours listening with the Simplistic powered by LAC batteries and the Reflektor

I still had oscillation from LM317 Pre regulators and as you sugested I powered straigt from CRC caps and reflektor and it works fine

I must say that for such a simple design simplistic is realy realy good and would reccomend any body to give it a try.

Only one bad point, and most probably my build, is the (not much realy) Hum from mains.
I recon is pick up from AC powered motor on turn table.

Most probably I was used to not hear this with my balanced INA satge.

Cristmass holidays new Job and life in general + a very cold loft have slowed me down a fair bit.

I am at present triing to build The Moving coil head amplifier from Small signal audio design Douglas Self.
Once that is done I will go back to Simplistic maybe this time with the standard build (I was using 24 V )and report back
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Old 29th December 2011, 09:39 PM   #7096
Salas is offline Salas  Greece
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I had witnessed many simplistics with no hum in installation, so there must be a way you will avoid too. Its just a high gain SE circuit with minute signal, and all the usual rules and precautions apply.

Best, happy new year soon.
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Old 30th December 2011, 08:30 AM   #7097
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Quote:
Originally Posted by Bksabath View Post
I still had oscillation from LM317 Pre regulators and as you sugested I powered straigt from CRC caps and reflektor and it works fine
Have you tried to use small caps, ~ 0.1F, soldering direct to the pins of the LM317 (from input and output to ground)? This should avoid oscillation.
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Old 30th December 2011, 12:24 PM   #7098
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Ol Joo

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Old 30th December 2011, 05:25 PM   #7099
orelli is offline orelli  Italy
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.@bksabath
when we talk about voltage duble means +6 dB, about power duble means +3dB. The swing of voltage is the same, simply we add the ground in the middle of the same swing.

@RCruz
I thinked the same thing
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Old 30th December 2011, 06:05 PM   #7100
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Good. I am looking forward to hear about your progress orelli.

Let us know if you need any help.
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