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Old 1st August 2010, 01:10 PM   #4271
Salas is offline Salas  Greece
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Quote:
Originally Posted by merlin el mago View Post
I don't understand nothing!!!!!!, please be so kind to post schematic or link, thanks?
#26 pre amp
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Old 1st August 2010, 03:00 PM   #4272
RCruz is offline RCruz  Switzerland
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The lid thing says it must mainly be loop area pick up. It would be great if you could see with an oscope that your power lines are free of any oscillation too. Can you shield the force cable runs also?

By tightening and shortening the gnd runs near power runs everywhere is certainly beneficial. Also, can your big film psu caps change orientation for a test, or just move regs in angles a bit and see if something changes?
I will move the regs a bit and see if something changes.

The shunt ccs led does not shine strongly.... Maybe I have oscilations there.... Need an oscope...
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Old 1st August 2010, 03:07 PM   #4273
Salas is offline Salas  Greece
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There was a Canadian member that had, but he could not get the LED light up at all, he found out after I gave him a tip on how. Look in the regs thread, I show some successful layout around 9610 and its tail components there. No doubt you need a scope in general. That is the reason I don't recommend 1.2 to the general DIY, its demanding for experience and check gear. But you can also see there what a German very experienced member found out when he got it running.
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Old 1st August 2010, 04:11 PM   #4274
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Salas,
What is the difference between v1.0 and v1.2?
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Old 1st August 2010, 07:56 PM   #4275
Salas is offline Salas  Greece
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More performance for Zo bandwidth and PSRR. Utilizes film caps, drifts for Vout a bit. More demanding for layout due to cascode CCS control elements and compound feedback pair output. Gives more resolution. Generally level 2 after having experience with V1. You can try V1.2 at a point after having a secure and finished phono with a surely easy to succeed V1 reg. Which is no slouch especially when Kelvin connected *remote.
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Old 1st August 2010, 08:01 PM   #4276
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I'll stick with v1 for a while...
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Old 1st August 2010, 09:27 PM   #4277
RCruz is offline RCruz  Switzerland
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Moving the shunts inside the case did not help... so I decided to shield power from shunts to riaa boards.

Used the same Klotz mic cable as before and connected the shiels to star gnd only on the shunt side.

Now hum is so low that can be ignored.

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Old 2nd August 2010, 08:54 AM   #4278
AndrewT is offline AndrewT  Scotland
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I decided to shield power from shunts to riaa boards.
Hi,
what was the arrangement of the power cable?
What are it's terminations like?
How does power run through the RIAA PCB from the power cable termination?
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Old 2nd August 2010, 11:21 AM   #4279
RCruz is offline RCruz  Switzerland
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Power comes from outboard psu into a 5 pin XLR.

Inside riaa case, power goes from XLR to the shunt using 2 core shielded cable. Shield is used to connect shunt to star gnd at XLR. Two inner wires carry (+) and (-).

From shunt to riaa board I use two cables:
Sense (+) and (-) are connected using single thin coax.

Force (+) and (-) connected using the same mic cable as before.

Remenber that I had no problem with my previous v1 shunt.
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Old 2nd August 2010, 11:55 AM   #4280
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Quote:
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What about this:

Click the image to open in full size.

Using your HV & LV shunt regulators to power it?

Wich Tx voltages & currents?

P.S. Sorry for off topic.

Last edited by merlin el mago; 2nd August 2010 at 12:12 PM.
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