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Old 10th January 2014, 06:31 PM   #21
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Location: Belgium the land of chocolate
88 Euro for one channel?
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Old 10th January 2014, 07:20 PM   #22
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Quote:
Originally Posted by meanman1964 View Post
88 Euro for one channel?
Yes one module price. Ready made module to the last detail, calibrated, tested, with packaging.

Mundorf, Nichicon, Vishay, Bourns, Semelab parts on PCB. 2 mm FR4 PCB metalized to 110 um thickness, fixation parts included.
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Old 10th January 2014, 08:02 PM   #23
egra is offline egra  Hungary
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88 € for one channel, 176 for both, top quality parts, professionally assembled PCB, experienced designer, ca. 350 € to complete the whole amp. The SQ is in the many (ten) thousand € top league. This is the real power of the diy community. Congratulations Lazy Cat!

egra
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Old 10th January 2014, 08:39 PM   #24
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Location: Lierde
Hi Andrej,

An SMPS it will be

When looking for an SMPS I came across those of AudioPower.
The DPS-500/S-64 looks good, here's the datasheet, is it a nice partner for "The First One" ?

In the wire amp thread there has been done some measurements on the DPS-600.

Regards,
Danny
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Old 10th January 2014, 10:10 PM   #25
Darb is offline Darb  Switzerland
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Hi Lazy Cat,
you can book me 4
Thx!
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Old 10th January 2014, 10:17 PM   #26
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Quote:
Originally Posted by Lazy Cat View Post
DPS-500/S-64 really looks like the right partner for the First One.
Hi Andrej,
Thx, I'll try them

What heatsinks are required for the First One with 3-4 ohm speakers ?

Regards,
Danny
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Last edited by danny_66; 10th January 2014 at 10:43 PM.
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Old 10th January 2014, 10:17 PM   #27
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Hi LC,
I am in for 4 modules!
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Old 10th January 2014, 10:18 PM   #28
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Hi Danny

DPS-500/S-64 really looks like the right partner for the First One. Since it has regulated voltages it could assure even more output power/headroom than SMPS1200A400 I use here. Namely SMPS1200 is unregulated and gives +/-60 V on my mains and goes down to 58,5 V when fully loaded on 4 Ohms. DPS-500/S-64 would remain at +/-63 V ensuring very good dynamics and low ripple, if it has sufficient current capability. I don't have any experience with it, but it would be nice if someone would test it with the First One.

P.S. I just looked to datasheet and it is OK, 10 A steady output current with repetitive peaks to 16 A.
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Old 10th January 2014, 10:36 PM   #29
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Clipping images of the First One. Supply voltage dropped to 58,5 V, clipp voltage 52 Vp.

1. 20 Hz
2. 1 kHz
3. 10 kHz
4. 20 kHz
Attached Images
File Type: jpg Clip 20 Hz.jpg (580.2 KB, 1853 views)
File Type: jpg Clip 1 kHz.jpg (598.4 KB, 1763 views)
File Type: jpg Clip 10 kHz.jpg (591.4 KB, 1702 views)
File Type: jpg Clip 20 kHz.jpg (658.3 KB, 1660 views)
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Old 11th January 2014, 02:20 AM   #30
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Quote:
Originally Posted by danny_66 View Post
Hi Andrej,
Thx, I'll try them

What heatsinks are required for the First One with 3-4 ohm speakers ?

Regards,
Danny
I recommend any heatsink having 0,5 K/W or even lower. Idle dissipation of the First One is 30 W at +/-63 V, plus audio power dissipation easily adding extra 50-70 W, so 100 W all together to dissipate. 100 W * 0,5 K/W=50 K added to room temperature resulting in 75 C heatsink temperature. At that point silicon die in output transistor is around 100 C and that is somehow at max acceptability.

Look to Fischer Elektronik web page, model SK 157 or similar.
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