Joachim Gerhard Filter Buffer for ES9022 - Page 48 - diyAudio
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Old 10th February 2013, 02:40 PM   #471
syklab is offline syklab  Hong Kong
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Quote:
Originally Posted by EUVL View Post
Not a bit overkilled for consumption of less than 20mA ?




Patrick
That was for driving the op-amp IV originally and just handly to use it for the JG buffer.
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Old 10th February 2013, 02:42 PM   #472
qusp is offline qusp  Australia
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@ Fran, the above is not a shunt, its a super-regulator type, the series version
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Old 10th February 2013, 03:01 PM   #473
VT67 is offline VT67  Belgium
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Quote:
Originally Posted by syklab View Post
I am using this super reg to power the buffer.

Click the image to open in full size.
I also have one of those lying around. Does that regulator really need such a big heatsink?

Regards
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Old 10th February 2013, 03:53 PM   #474
syklab is offline syklab  Hong Kong
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Quote:
Originally Posted by VT67 View Post
I also have one of those lying around. Does that regulator really need such a big heatsink?

Regards
Not really, may be sufficient to just use one of this heat sink.

Click the image to open in full size.
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Old 10th February 2013, 04:04 PM   #475
Ryssen is offline Ryssen  Sweden
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I am using a shunt,but I have not gotten my 9023 DAC pcb yet..
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Regards Åke
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Old 10th February 2013, 04:10 PM   #476
EUVL is offline EUVL  Europe
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The active circuit is a cascoded JFET follower.
The follower JFET (BF862 upper) is cascoded and see a constant Vds pretty independent of output voltage.
The lower is a cascoded current source.
As such, the circuit has good PSRR.

For my "kitchen radio" (otherwise known as Sisters' Series), I just use 7815 / 7915.
For a slight upgrade a LT1763/LT1964 on 78xx/79xx pin compatible PCBs.
Or the XEN miniature Cap multiplier.



Even if you wish to use a shunt, your CCS current does not need to be more than 35mA.
A boostered TL431 would do.


Patrick
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Old 10th February 2013, 05:59 PM   #477
shoom is offline shoom  Europe
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Hi Fran

i'm using salas shunts
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Old 10th February 2013, 08:58 PM   #478
EUVL is offline EUVL  Europe
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I just realised that the current values quoted in post #469, 470, & 476 were not well defined.

According to our record, the JFETs that Fran has have Idss of around 14mA.
So thet figure of 28mA he was referring to in post #469 was for one PCB, or two single-ended channels.

And I was misled by the phase he used "on each leg".
So the numbers I gave in post#470 and in #476 were for one channel.

Thus, for 2 single-ended channels, or one PCB, the max current consumption can be about 50mA.
If you then choose to use a shunt regulator, the current source should be delivering minimum 60mA.
(Some of you will of course argue that even 55mA is sufficient.)


Sorry for causing any confusion,
Patrick
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Old 11th February 2013, 10:36 PM   #479
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EUVL - you are 100% correct, that is for 2 channels. 28mA for each polarity.


I thought I'd throw up a pic of my almost finished build. I'm using EUVLs 9022 dac (run on batteries) and the filter run from the salas shunt (the old hypnotise B1 boards butchered a bit). The other bits are for charging the batteries.

I had a bad mistake. When I reassembled everything I had no sound and DC offset from the DAC. I fried the 9022 - easier to do than you think with the batteries. After some advice and instructions from EUVL (thanks again!) I managed to remove the dead 9022 and replace it.

All is good, and I can tell you it sounds great with a shigaclone transport.


Fran
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Old 12th February 2013, 12:54 AM   #480
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That looks wild !
Anyway, when it sounds good it is good.
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