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First One - mosfet amplifier module
First One - mosfet amplifier module
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Old 14th May 2014, 07:52 PM   #721
meanman1964 is offline meanman1964  Belgium
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Quote:
Originally Posted by Lazy Cat View Post
Hi, can you direct me to some link where temp coeficient of this heatsink is noticeable?

First One has 280 mA idle current (sum current per rail) so at +/-63 V module is dissipating 35,28 W idle power and that is quite a lot because it is constant, filling heatsink thermal capacity substantially, something not to underestimate at all.
Dissipation is 0,67Kw
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Old 14th May 2014, 09:12 PM   #722
Lazy Cat is offline Lazy Cat  Slovenia
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Quote:
Originally Posted by Theodosis O. View Post
Hi LC, two red beauties are here, Thanks

One question:
What about single SMPS3k instead of dual SMPS1200, sound wise ?
Same SMPS generic, never tested but yes, very much possible the same sound character although with unlimited power.

Quote:
Originally Posted by meanman1964 View Post
Dissipation is 0,67Kw
Theatsink=Troom + 35,28 W * 0,67K/W=23C + 23,64C=46,64C (idle)

Quite high heatsink temperature in idle state, I would suggest to use 0,5K/W or even less.
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Old 14th May 2014, 10:18 PM   #723
Lazy Cat is offline Lazy Cat  Slovenia
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Exclamation Important notice to GB members

Hi all dear

Guys don't be fooled with a small size of the First One modules possibly holding in your hands just now, got to know this: this is a very BIG amplifier considering sound signature, be prepared to be strongly surprised immediately after turning this little beast alive.

At the moment, all GB members already received the modules, please slowly prepare all the mechanics, chassis, heatsinks, terminal connectors, etc., but please don't do any wiring yet. On daily basis testing of the First One in the chassis is taking place, the aim is to find out the best possible grounding scheme and I can tell you all that we already have it. Final touch in day or two and then new detailed chassis wiring scheme will be published in this thread or maybe just sending it to PM of GM members, we'll see.

Regards, L.C.
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File Type: jpg First One chassis 5.jpg (393.1 KB, 797 views)
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Old 15th May 2014, 10:28 AM   #724
camelator is offline camelator  France
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Hi LC,
it really sounds good. I really enjoy this project.

Please excuse my stupid question, but on page 1, it is written:

"Maximal power (20 Hz - 20 kHz, THD 0,1 %)
160 Wrms/8 Ohm
250 Wrms/4 Ohm"

So why a SMPS1200 is needed ?

Regards,

Christian.
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Old 15th May 2014, 10:33 AM   #725
Theodosis O. is offline Theodosis O.  Greece
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LC the Mundorfs onboard are rated at 63 volt.

The Hypex SMPS output 64 volt.

Is it safe ?

Last edited by Theodosis O.; 15th May 2014 at 10:40 AM.
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Old 15th May 2014, 10:51 AM   #726
supernet is offline supernet  Europe
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Quote:
Originally Posted by Theodosis O. View Post
LC the Mundorfs onboard are rated at 63 volt.

The Hypex SMPS output 64 volt.

Is it safe ?

Mundorf max. short term voltage rating is 72V. Since Hypex smps are not regulated, their output voltage sag under the load. With 230V mains voltage, you get around 59-60V.
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Old 15th May 2014, 11:05 AM   #727
Lazy Cat is offline Lazy Cat  Slovenia
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Quote:
Originally Posted by camelator View Post
Hi LC,
it really sounds good. I really enjoy this project.

Please excuse my stupid question, but on page 1, it is written:

"Maximal power (20 Hz - 20 kHz, THD 0,1 %)
160 Wrms/8 Ohm
250 Wrms/4 Ohm"

So why a SMPS1200 is needed ?

Regards,

Christian.
Because of its output current capability, speaker's impedance can easily go as low as 2 Ohm anywhere in impedance curve, so if we calculate current needed ...
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Old 15th May 2014, 11:13 AM   #728
_henry_ is offline _henry_  Australia
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is this really stable @2ohm?
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Old 15th May 2014, 11:16 AM   #729
Theodosis O. is offline Theodosis O.  Greece
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Quote:
Originally Posted by supernet View Post
Mundorf max. short term voltage rating is 72V. Since Hypex smps are not regulated, their output voltage sag under the load. With 230V mains voltage, you get around 59-60V.
I have 233 - 240 Volts here.

Is it OK or we will have fireworks ?

Last edited by Theodosis O.; 15th May 2014 at 11:30 AM.
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Old 15th May 2014, 11:42 AM   #730
hcbonfim is offline hcbonfim  Brazil
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Hi,

First One sound impressions are welcome please,

best regards.

hcbonfim
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