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Analogue Source Turntables, Tonearms, Cartridges, Phono Stages, Tuners, Tape Recorders, etc.

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Old 14th January 2012, 02:09 PM   #4391
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Funny, nobody has found out so far whats really going on. I see this as an opportunity to find out.
Anyway, this is a minor problem. I am just listening to a phono stage with UF4004 without snubber and the sound is great. Extremely low noise. I can hear the type of vinyl in the lead groove.
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Old 14th January 2012, 02:18 PM   #4392
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I found steel cases for toroid transformers.
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Old 14th January 2012, 03:07 PM   #4393
AVWERK is offline AVWERK  United States
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Cree has some new silicon carbide diodes that look interesting. Has anyone tried these yet? Got some samples coming.

Regards
David
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Old 14th January 2012, 03:20 PM   #4394
tvi is offline tvi  Australia
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Japan patent JP2006288180
AC-INPUT TO DC-OUTPUT CONVERTER CIRCUIT
Quote:
PROBLEM TO BE SOLVED: To provide an AC-input to DC-output converter circuit in which, in time zones (forward recovery times, reverse recovery times, time zone when voltage is applied to microarea) where electric currents do not flow through a load during diode rectification, an auxiliary power supply circuit is provided so that electric current flows through the load where electric current is insufficient, thereby improving ripples, or the like, in series power supply circuits.
degawa A&R Lab

Development of Second Generation Series Power Supply Module Exceeding Battery-operated Power Supply


Rectified and smoothed DC supplying circuitry US4555751 ONKYO
Quote:
A DC power supply circuitry comprises an AC power source transformer with its secondary winding having a center tap; a rectifier circuit; a smoothing circuit; and a bidirectional switching circuit having predetermined threshold values, interposed in between the center tap and the smoothing circuit.
POWER SOURCE CIRCUIT JP58172976 ONKYO
Quote:
:The center tap 6 of a power transformer 1 and the connecting point P of smoothing condenser 4, 5 connected in series with each other, i.e., the negative terminal 4b of the condenser 4 or the positive terminal 5a of the condenser 5 are connected through a bidirectional switch circuit 1 with the prescribed threshold value. The center-tap current is blocked by diodes D1, D2 in the range that the voltage difference between the connecting point P of the condensers 4, 5 and the center tap 6 does not exceed the threshold value of a bidirectional switch circuit 11.; The secondary coil current of the power transformer, the condenser current and the center tap current become only the amplitude information and do not contain signal frequency component.
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Old 14th January 2012, 04:34 PM   #4395
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For my best stages i use Ixis Silicon Carbide bridges. Sorry, i did not make a sonic comparison though.
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Old 14th January 2012, 04:47 PM   #4396
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Unfortunately this 6 terminal black box is not described in detail.
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Old 14th January 2012, 05:12 PM   #4397
FdW is offline FdW  Netherlands
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Quote:
Originally Posted by Joachim Gerhard View Post
Unfortunately this 6 terminal black box is not described in detail.
http://www.net1.jway.ne.jp/nagaokm/e...ESpaneleng.pdf

Lots of claims, no real explanation
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Old 14th January 2012, 06:04 PM   #4398
tvi is offline tvi  Australia
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He seems to have replace the attached circuit with a block diagram in later (?) descriptions
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Old 14th January 2012, 06:24 PM   #4399
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Thanks, that looks interesting.
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Old 14th January 2012, 07:44 PM   #4400
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Maybe this might be a place to play with a stepped rectifier?
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