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Old 28th August 2012, 09:55 PM   #7121
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Quote:
Originally Posted by Bksabath View Post
... welding...
Not sure if this is the way to go .
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Old 30th August 2012, 10:55 AM   #7122
quan is offline quan  Australia
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Hi guys ,it 's gone quiet for a bit. Just would like to know the criteria for selecting BC337 and BC327 so i can prepare in advance. Just got the semiconductor analyser (peak Electronics).
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Old 30th August 2012, 11:11 PM   #7123
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So i have ordered the pcb and the part from the gb. I would also like to start collecting the other parts. Now i am a bit unclear on the needed ingredients of this recipe:

- 2 x 24v, minimum 20va per channel (two for dual mono)?
- preregulator, is there any views on a good solution?
- the schematic shows an external riaa circuit. Does that mean that the circuit is not included on the pcb, and the components are not part of the gb?
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Old 30th August 2012, 11:22 PM   #7124
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Select for Hfe and make groups for the input stage and the mirrors.
10% match is good enough, other may like a tighter match.
2 x 24V DC 20VA is for one channel. You need two supplies for double mono.
We have shown several circuits that can work as pre regulators. I have to search myself.
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Old 31st August 2012, 08:48 AM   #7125
FdW is offline FdW  Netherlands
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Quote:
Originally Posted by studiostevus View Post
So i have ordered the pcb and the part from the gb. I would also like to start collecting the other parts. Now i am a bit unclear on the needed ingredients of this recipe:

- 2 x 24v, minimum 20va per channel (two for dual mono)?
- preregulator, is there any views on a good solution?
- the schematic shows an external riaa circuit. Does that mean that the circuit is not included on the pcb, and the components are not part of the gb?
These are the most important/relevant messages regarding PSU and Pre-Reg.

Mpp - Post 4375 PSU-pre-regulator

Mpp - Post 4610 V2 Schemas UPS and Amp

Mpp - Post 6506 CCS fine-tuning

Mpp - Post 6462 PSU with my notes

Mpp - Post 6809 Do not try to feed the CVS of the CCS of the shunt with a regulated power supply

Have a look at these and the following messages.
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Old 31st August 2012, 09:24 AM   #7126
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Thanks Frans,

So I gather the questions to my answers are (or the other way around):
- 2x24V (20VA) per channel... the required input voltage for the shunts would be about 24VDC... so even lower voltage trannies would probably be ok (except when using tube rectification).

- Preregulator: I see there are concerns between unwanted interaction/oscillation between pre-regulator and the shunt regulators on the board. The shunt regulators by FdW are fed by a CCS which is fed by a CVS, so I would assume they don't need pre-regulation. Would a simple CLC be sufficient?

- There is an riaa circuit on the pcb, but there is an option to connect an external riaa circuit as well.

Right?
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Old 31st August 2012, 09:58 AM   #7127
FdW is offline FdW  Netherlands
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Quote:
Originally Posted by studiostevus View Post
Thanks Frans,

So I gather the questions to my answers are (or the other way around):
- 2x24V (20VA) per channel... the required input voltage for the shunts would be about 24VDC... so even lower voltage trannies would probably be ok (except when using tube rectification).

- Preregulator: I see there are concerns between unwanted interaction/oscillation between pre-regulator and the shunt regulators on the board. The shunt regulators by FdW are fed by a CCS which is fed by a CVS, so I would assume they don't need pre-regulation. Would a simple CLC be sufficient?

- There is an riaa circuit on the pcb, but there is an option to connect an external riaa circuit as well.

Right?
The minimum would be 2x24VDC(about 18VAC(min), 20VAC(best, I like it ), 24VAC(max, if you like it hot )) 15VA(recomended minimum), 20VA has a bit of headroom. So the answer is Yes.

Note: 15VA is good for a 18VAC transformer, for the 24VAC transformer you need, (15/18)*24 = 20VA(min)

Using a pasive pre will be safe, using a active pre is not recomended. So the answer is Yes.

About the riaa, the answer is Yes.

Last edited by FdW; 31st August 2012 at 10:17 AM.
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Old 1st September 2012, 08:18 PM   #7128
RCruz is offline RCruz  Switzerland
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Been listening to the Paradise for severall days now... It became my primary source... believe I'm hooked.... Quoting JG.. psycadelic is the right designation for its sound.
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Old 1st September 2012, 08:32 PM   #7129
pdul is offline pdul  Denmark
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You are putting a big strain on poor Hesener and the shipping of a truckload of boards, by saying something like that
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Old 1st September 2012, 08:38 PM   #7130
pdul is offline pdul  Denmark
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Expectations are going up, even the soldering iron will start drooling soon
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