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Best low noise regulator?
Best low noise regulator?
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Old 3rd March 2009, 05:30 PM   #111
Salas is offline Salas  Greece
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Best low noise regulator?
Its difficult to ''see'' subjective impacts between very well performing regulators just by modeling or measurement. Most are technically more than adequate for their main mission. But if not actually implemented and subjectively tested they can't really be selected. Of course this will sound weird to all engineers, but what can I say more? Its my practical experience or illusion . I have promised you better highs with the LED Mosfet CCS, remember? Those subjective things magnify if in phono circuits. Yours is line if I remember correctly?

P.S. That 27V/1W over the zener in the circuit under the scope pic is a typo. Its actually a 24V Zener, and its part number is correct. It can be made for different voltages by changing the Zener and feeding about 7-8V more Vin than Vout. The limit is about 43V DC Vin due to the 40V max of the 2SK170 on the left. I change that to a ring of two higher voltage pair if I wanna go higher. I use about 10mA Idss or I set the ring of two at 10mA so to help the LEDS work at their good region. Red or green under 2V ones are most adequate.
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Old 3rd March 2009, 05:48 PM   #112
juma is online now juma  Germany
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Of course, I had previously experienced what you say so it's no surprise to me, but you have to admit that when you need a quick check of the circuit it's so tempting to use LM317 - it's so simple

Naturally, we are now talking nuances and tastes are different, but it is undeniable that difference in sound exists.

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Old 3rd March 2009, 05:51 PM   #113
Salas is offline Salas  Greece
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Best low noise regulator?
I admit! But I am happy also that you did not stay to the quick solution and you tested the properly advised one. Good listening.
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Old 3rd March 2009, 05:52 PM   #114
juma is online now juma  Germany
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Only thing that worries me is Pd of Q2 - with 10mA Id Pd is more than 250 mW
It might be solved by using the R5 of higher value - like 1K maybe ?
Otherwise
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Old 3rd March 2009, 05:54 PM   #115
jan.didden is offline jan.didden  Europe
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Old 3rd March 2009, 05:56 PM   #116
jan.didden is offline jan.didden  Europe
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Salas,

I'm not sure I understand your shunt reg. How much current is there going through the zener? And where is that current going to?

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Old 3rd March 2009, 05:56 PM   #117
Salas is offline Salas  Greece
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Best low noise regulator?
Quote:
Originally posted by juma
Only thing that worries me is Pd of Q2 - with 10mA Id Pd is more than 250 mW
It might be solved by using the R5 of higher value - like 1K maybe ?
Otherwise
Its a 400mW part and none have failed in 5 months 24/7 power on. So no worries.
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Old 3rd March 2009, 05:57 PM   #118
jan.didden is offline jan.didden  Europe
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No that's not my point. How much current does it run, and where is that current going to? Into the base or into the current source?

Jan Didden
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Old 3rd March 2009, 06:02 PM   #119
Salas is offline Salas  Greece
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Best low noise regulator?
Quote:
Originally posted by janneman
No that's not my point. How much current does it run, and where is that current going to? Into the base or into the current source?

Jan Didden

Sorry, that was going to Juma, but you posted in meantime.

Q5's almost Idss current runs through the Zener. Its not going to the BC550C's base.
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Old 3rd March 2009, 06:03 PM   #120
AndrewT is offline AndrewT  Scotland
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Idss ~10mA.
a little into the BC base.
Therefore ~10.02mA through the Zener.
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