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Old 17th October 2008, 07:09 PM   #21
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Default Schematics 2

Here is complete power supply schematics. I have completely assembled power supply and tested.

Integrated functions:
input filter
power on/of sequencer with soft start
thermal protection
standard fuse protection
remote on/off by DC or AC 12V signal
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Old 17th October 2008, 07:24 PM   #22
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Cool PCB Power supply

PCB Power supply except rectifierd board
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Old 17th October 2008, 07:33 PM   #23
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Default Picture

Here is current picture of amplifier (still under construction )
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Old 9th December 2008, 06:01 AM   #24
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Hello

Here is picture from yesterday evening. I'm nearly before amplifier first turn on.
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Old 9th December 2008, 06:33 AM   #25
Gyuri is offline Gyuri  Hungary
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Well, Tomas, I believe it, you will have beautiful warm Christmas this year.
Wonderful amplifier, I congratulate you!
With a friendly greeting:
Gyuri
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Old 9th December 2008, 07:14 AM   #26
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Thanks….Several weeks I didn’t have much time to finish amplifier. Hopefully I finish amplifier during last two weeks in December (I have vacation). I began write some simple documentation with short description, schematics, PCB, component layouts, components list. I share documentation once it I finish it.
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Old 20th December 2008, 06:56 PM   #27
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Default DC Protection circuit

After several days I finally have time to move forward with my Aleph... . Today I tested DC protection circuit for speakers. Original design is working but circuit reaction is slow. I little bit tune up circuit and now it is working fine. Tested and working schematics is here:
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Old 20th December 2008, 08:11 PM   #28
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Default Power supply - soft start

Power supply

During several test I found that currently used soft start topology is not capable correctly control/limit inrush current. Some problems with circuit was expected but I'm really surprised how big inrush current requires power supply with total capacitance 0.376 F (I build several amplifier but never used more than 22mF of total capacitance). I'm thinking about circuit replacement by something like is used in A75 power supply or use SSR with ability to switch ON/OFF in zero voltage.
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Old 21st December 2008, 06:03 AM   #29
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Exclamation SSR

Good explanation why is not recommended to use SSR with switching in zero:
http://www.schrackrelays.com/appnote...fs/13c3206.pdf
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Old 21st December 2008, 07:51 AM   #30
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Szervusz Tomas!
Excellent article!
According to my solution the network voltage pass through to the 3KVA toroid an 10 ohms who-knows-it-how-many-watt wire resistance with a ceramics body. It is maybe 32,5A flowing at a worst case on the resistance if we look at it this only so. I lock short after the hooks of the resistance with an 40A zerocrossing solid-state relay.
You may look at this here:
http://www.diyaudio.com/forums/attac...amp=1114953975
I do not say that you should make it in this wise. But I know that you will prepare a much more beautiful solution anyway. I wanted to provide an idea to you only.
The solution of the minor matters is not my strength according to my viciousness unfortunately. I insert the amplifier's forked cork into the electric network, then (if I do not forget it) I set off the relay with a little switch. The big green resistance endures my absent-mindedness relatively well. I should create some little delaying electronic circuit only though.
I am lazy only.
With a Christmas greeting:
Gyuri
I hope for it, my earlier prophecy proves true!
I do not say that you should make it in this manner. But I know that you will prepare a much more beautiful solution anyway. I wanted to provide an idea to you only.
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