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Old 4th March 2014, 05:16 PM   #1241
shoom is offline shoom  Europe
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Great work Alfred
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Old 10th March 2014, 01:59 AM   #1242
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Ugh. Just saw this thread after reading the positive comments regarding the Calvin buffer. No way for me to add in an order for 4 boards? Also, can anyone provide a link to the BOM for the buffer?
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Old 10th March 2014, 03:46 AM   #1243
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Hesenerīs signature has the link to all the latest documentation ...

https://docs.google.com/document/d/1...-tE/edit?pli=1

this also is the same link
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Old 10th March 2014, 04:10 PM   #1244
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Thanks Manolo for the info.

I guess I'll just have to keep watch here if there are any extra boards.

P.S. Can anyone comment if there are any appreciable sonic differences between this version (what seems to be a through hole version) and the LSK389 / matched BF862 all SMD version in the original preamp buffer idea thread?
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Old 10th March 2014, 05:56 PM   #1245
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Thanks Alfred! Sent payment via Paypal
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Old 11th March 2014, 04:33 PM   #1246
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Default Paradise PreReg Group Buy Assessment of Demand

This is a post copy from the Prereg Thread!

Hi Guys,

i just talked to Peter and he would do another round of Prereg PCB production if we get together at least 20 Stereosets = 40 PCBs for production.

It seems to be a pretty good time for this, as many people have ordered new Paradise Boards from Alfred and may need some powering for those.

To get a rough shot on your need for Prereg PCBs, please send me an Email or PM so that i can fill the following table:

https://docs.google.com/spreadsheets...it?usp=sharing


If there is enought interest, i'll talk to Peter and we start the official round of the group buy.

Note, that this time, it will only be the PCBs.

Price will most certainly be the same as the last time, which is 44€ per Stereoset + package and handling.

Cheers,
Walter
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Old 24th March 2014, 10:41 PM   #1247
hesener is offline hesener  Germany
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Hi everybody,

looks like the waiting will soon be over, the boards are manufactured and shipped, on their way to myself.... With a little bit of luck I should be ready to ship next week or so.... please bear with me as I have a daytime job too.....

best regards
alfred
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Paradise documents are here: Link list
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Old 25th March 2014, 02:26 PM   #1248
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Keep in mind, that there might be also a GB for Prereg Boards. Just put your details into the following document:

https://docs.google.com/spreadsheets...it?usp=sharing


Cheers,
Walter
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Old 26th March 2014, 06:32 AM   #1249
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Quote:
Originally Posted by hesener View Post
Hi everybody,

looks like the waiting will soon be over, the boards are manufactured and shipped, on their way to myself.... With a little bit of luck I should be ready to ship next week or so.... please bear with me as I have a daytime job too.....

best regards
alfred
canīt wait to get my soldering iron on them !!!!!

thanks for everything alfred

abrazo

manolo
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Old 26th March 2014, 09:51 AM   #1250
Calvin is offline Calvin  Germany
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Hi,

Quote:
Can anyone comment if there are any appreciable sonic differences ...
Probabely none, except that I spewed my holydevellish sermon over the originals

The LSK/BF may be a tad lower in noise figure, but that doesnīt play any role here.
There may also be slight differences in THD level and harmonic distribution.
Again, nothing of prominence.
The cascoding JFET probabely mark the biggest dfference, as the 4391 generates ~4V of gate-source voltage while the J107 provides only ~2-3.
This voltage at the same is the LSKs or PFs drain-source voltage.
If one look s at the datasheets Id-Vds (with Vgs as parameter) curves theresīs a quite linearly rising part up to 1-2V of Vds, the so called resistive part, where a JFET behaves like a voltage controlled resistor. Than follows a small bended transition region, followed by the saturation region where the curves tend to the horizontal.
Used as amplifier a transistor is held within the saturation region.
In tendency its better to have some Vds, as Vds typically varies all over the x-axis and the transistor behaviour is more linear.
In our case though the cascoding transistor Q2,Q5 hold the Vds of Q1,Q4 quite constant so that the linearity issue is of minor importance.
The cascoding JFETs Vds reduces the maximum output voltage of the circuit, as it must be subtracted from the supply voltage.
In our case the maximum output voltage of the Paradise is so much lower than the supply voltages, that it also doesnīt matter which transistor is used.
Remaining Qs regard technology (SMD, mixed, or Throughhole), sourceabilty and costs.
Leaving Calvin Spew the only decisive matter of sonic character

jauu
Calvin
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