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Old 6th December 2012, 09:50 AM   #2751
AndrewT is offline AndrewT  Scotland
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post2746
As stated : very nice.
I would double insulate the mains voltage wiring, not the LV wiring.

Another unhelpful post?
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Old 6th December 2012, 08:04 PM   #2752
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This is a my diy amplifier based on LME49810 high fidelity power amplifier driver. I used a discrete output stage with MJE15032/3 and two pairs MJ15003/4.
The schematic used you can find in driver's PDF. I designed my own layout with separate signal GND of power GND.
The power source is a full-bridge power converter based on ETD49 core.
Pulse modulator control circuit is provided by SG3525 and NCP5181 are power mosfet driver. Without power factor corection.
Soft start is realized by the SG pin 8 capacitor.
Switching power is made with a remote control socket. I transfered the socket's pcb in my enclosure.
The ampl was tested with a dummy load ( five resistors 27 ohms/100W connected in paralel mod).
Unfortunately, my DS203 signal generator can't give a output signal more then 1Vrms.
The sound is great.
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Old 6th December 2012, 08:12 PM   #2753
DQ828 is online now DQ828  Australia
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Quote:
Originally Posted by AndrewT View Post
post2746
As stated : very nice.
I would double insulate the mains voltage wiring, not the LV wiring.

Another unhelpful post?
The idea was to shield the signal wiring, the RED cable has a braided copper & foil shield, I stripped out the center core & ran all of the signal wires through them
. But you are right on the double insulation for the mains, I should have done that as well.
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Old 7th December 2012, 06:57 AM   #2754
Bonsai is offline Bonsai  Taiwan
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It then depends on whether you have a 4ohms capable amplifier, or an 8ohms capable amplifier. It sounds from your reservation on SOA for the 5pr output stage that you are not claiming 4ohms capability. Have you tried Bensen's SOA spreadsheet, or do you have an alternative SOA modeling method?

If it's 280W into 8ohms, then a minimum test load I would use would be 2r0, but more probably 2r67 to check Vpk when 1/3 rated impedance is connected.
I am quite happy that it will deliver 500W into 4 Ohms (heatsink/thermal limits) and drive 2 Ohms load peaks for short periods). I am just not happy driving 2 Ohms for extended periods. This is a very capable amp.
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Old 7th December 2012, 09:25 AM   #2755
AndrewT is offline AndrewT  Scotland
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test into 2r0 is not a heatsink test.
I consider it to be a current capability test.
That "current capability" does not need to be proved over one minute, not even for ten seconds.
One second is long enough for the PSU to droop to it's final value and for the output voltage to be measured/recorded while driving the dummy load.

It's a test I do on all my amplifiers. Check the maximum unclipped voltage into a load that is 1/3 (one third) of the rated impedance. I expect all my amplifiers to be within 1dBV of the maximum voltage into the rated load. Some will mange -0.4dBV and I use this information to judge the current capability. This test is quite different from driving a near short circuit to determine peak output current at near zero output voltage.
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Old 7th December 2012, 02:09 PM   #2756
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Did I already post a picture of my latest build?

Click the image to open in full size.

http://www.abload.de/img/symasym001dkknk.jpg

It is a SYMASYM, which I will give to my brother as Christmas present.
It consists of: a single power supply (2 x 25 VAC / 300VA toroid, DX power supply PCB with 40.000F in total), two TO264-SYMASYM PCBs
with 2 pairs of NJW0281G / NJW0302G each, George Stantscheff's Lighspeed Attenuator being controlled by a motorized 100K
BOURNS potentiometer (the control PCB being inspired by FOTIOS), a cheap (50€ !) and nice chinese case, ...

And it is DIY.
For example: the infrared detector is glued to the front plate by 2 stripes of Wrigley's chewing gum. So this build has my DNA !

And it sounds like the second-to-best amplifier that I have ever listened to.

Best regards - Rudi_Ratlos
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Old 7th December 2012, 02:12 PM   #2757
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well done Rudi !!!
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Old 7th December 2012, 02:28 PM   #2758
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Originally Posted by Rudi_Ratlos View Post
......And it sounds like the second-to-best amplifier that I have ever listened to......

Best regards - Rudi_Ratlos
Which one is the best you have listened to ?
Cheers.
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Old 7th December 2012, 02:45 PM   #2759
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Ashok: I will give you a "diplomatic" answer to not affront any designer, who has published his amplifier in this forum. They are all the best!

But: Mihai's (ROENDER) FC-100 is a very outstanding amplifier.

Best regards - Rudi
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Old 7th December 2012, 02:58 PM   #2760
redjr is offline redjr  United States
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Very nice Rudi. I love a well executed build - both inside and out. Looks great! Rick
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