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Old 1st January 2012, 09:18 PM   #4051
FdW is offline FdW  Netherlands
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Default From the lab (yes they started bright and early in the New Year)

Happy new year to you and everyone around you

And I do have a New Year’s present.

Extensive research in the new year has led to the discovery of an small but useful improvement to the power supply.

The line regulation under extreme load can be improved significantly by replacing the 2.2K resistor with a 2mA current source. Line voltage ‘swing’ under extreme load (50mA AC on top of 50mA DC) goes down from 346uV (already very low) to 27uV (and that is extreme low).

The current source can be created by replacing the resistor with a J310 fet that has an 1.5K gate-source resistor connected (see detail schema).

P.s. I already informed Hesener and he will make the change.

P.s. Joachim this solves the ‘not so low floor’ problem in the previous FFT, the FFT floor is now about 33dB lowered. See: 3988.
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Last edited by FdW; 1st January 2012 at 09:42 PM.
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Old 1st January 2012, 09:47 PM   #4052
Joachim Gerhard is offline Joachim Gerhard  Germany
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Small things can have a big effect. Very well. I still like the relative simplicity and effectiveness of that circuit. I understand it even a bit so i am learning here too.
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Old 1st January 2012, 10:45 PM   #4053
RCruz is offline RCruz  Switzerland
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Strange just finished measuring 200 BC337 NPN and found Min Hfe 429 and Max 557.
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Old 1st January 2012, 11:46 PM   #4054
Joachim Gerhard is offline Joachim Gerhard  Germany
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Sometimes a blind hen finds a corn.... (:
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Old 2nd January 2012, 11:19 AM   #4055
Benedetto is offline Benedetto  Germany
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Off topic, on
does somebody know if "Panasonics ECHS" got
any Audiophile benefits ?
They are cheap @ Pollin by the moment...
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Old 2nd January 2012, 11:23 AM   #4056
Joachim Gerhard is offline Joachim Gerhard  Germany
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Yes, they have. They are PPS, that is new material from Japan that substitutes Polycarbonate. Maybe they need that in cars.
It is very temperature stable and has low distortion ( Bateman et.all. ).
It has higher DA though then PP or Styroflex. I use Rifa PPS in the signal chain and it sounds transparent ( not there ).
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Old 2nd January 2012, 06:31 PM   #4057
mad_z is offline mad_z
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It may be ECHS have magnetic wires - if that is of any concern to you. I will check and report a.s.a.p. I am using Panasonic PPS too and find them very fine. The same for RIFA PPS.

Best Wishes for 2012 for All of you!!
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Old 2nd January 2012, 07:40 PM   #4058
Benedetto is offline Benedetto  Germany
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Thanx, sounds good to me.
I'll order some.
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Old 2nd January 2012, 07:48 PM   #4059
RCruz is offline RCruz  Switzerland
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blind hen
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Old 2nd January 2012, 07:53 PM   #4060
Benedetto is offline Benedetto  Germany
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Want some.....?
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