"The Wire AMP" Class A/AB Power Amplifier based on the LME49830 with Lateral Mosfets - Page 217 - diyAudio
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Old 24th May 2013, 04:34 PM   #2161
AndrewT is online now AndrewT  Scotland
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Don't leave them as exposed conductive parts.
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Old 24th May 2013, 04:51 PM   #2162
opc is offline opc  Canada
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Is that meant to be humorous?

Honestly... how would you do it?

Speaker binding posts have to be exposed to the end user, who is then intended to connect two exposed wires to them (no certification on the wires required unless they're in a wall), and run those to the loudspeaker (also no certification required... could have either of the two terminals connected to the driver chassis and exposed). Even insulated posts are easily accessible by the end user.

Same applies to XLR and a variety of other connectors.

The bottom line is that bonding everything to earth is not a feasible proposition, and as a result, you're much better insisting that people focus on understanding safe design fundamentals so they aren't doing a variety of unsafe things inside a box and hoping that a ground conductor will save their bacon in the event of a serious mistake.

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Owen
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Old 6th June 2013, 04:22 AM   #2163
opc is offline opc  Canada
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A new run of these boards is now available!

Please see the following thread for details:

http://www.diyaudio.com/forums/solid...ml#post3516741

Cheers,
Owen
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Old 11th June 2013, 09:25 PM   #2164
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Quote:
Originally Posted by opc View Post
Is that meant to be humorous?

Honestly... how would you do it?

Speaker binding posts have to be exposed to the end user, who is then intended to connect two exposed wires to them (no certification on the wires required unless they're in a wall), and run those to the loudspeaker (also no certification required... could have either of the two terminals connected to the driver chassis and exposed). Even insulated posts are easily accessible by the end user.

Same applies to XLR and a variety of other connectors.

The bottom line is that bonding everything to earth is not a feasible proposition, and as a result, you're much better insisting that people focus on understanding safe design fundamentals so they aren't doing a variety of unsafe things inside a box and hoping that a ground conductor will save their bacon in the event of a serious mistake.

Regards,
Owen
It is possible. Speakon connectors are fully insulated IIRC (inasmuch as IP2X is relevant).
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Old 6th July 2013, 09:47 AM   #2165
parb is offline parb  United States
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Originally Posted by opc View Post
A new run of these boards is now available!

Please see the following thread for details:

http://www.diyaudio.com/forums/solid...ml#post3516741

Cheers,
Owen
when do you think you will have an idea on ordering/delivery timelines?
Also, is there any recommended PSU designs with the dual voltages that is recommended? I am planning to go with a linear power supply and i have some ideas on approaches but i wanted to see what others had done in this area (i've seen the smps approaches in the thread but i suspect i wont do that).

I am planning an amp for multiple channels so i had in mind a shared transformer but dedicated rectifying circuits for each board.

thanks!
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Old 6th July 2013, 10:00 AM   #2166
AndrewT is online now AndrewT  Scotland
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......................I am planning an amp for multiple channels so i had in mind a shared transformer but dedicated rectifying circuits for each board. ..............
It is only worthwhile using separate PSUs if your transformer has multiple pairs of secondary windings. This isolates each PSU and it's Main Audio Ground from each of the other channels.
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Old 6th July 2013, 03:59 PM   #2167
parb is offline parb  United States
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that was my thinking. for a linkwitz lx521 i could use a transformer with four secondary windings for each channel this would help me with implementation issues relating to ground and hum if i used separate PSU's. but i wanted to check to see if it was worthwhile vs. going for a single transformer and a shared PSU between the fet stages (i would use a shared power supply for the low power stage anyway).

thoughts on the approach?
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Old 6th July 2013, 06:00 PM   #2168
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There is a lot of discussion here regarding the DSP600 SMPS. Has anyone tried this amp with other SMPS? In particular, the Hypex SMPS600 looks suitable. Sorry if I missed this in the earlier threads. Your experiences would be appreciated.
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Old 19th July 2013, 12:12 AM   #2169
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I have finally wired the modules into a dedicated chassis. Here are a couple of pic's the internal one is taken when near completion, there was still some insulation to be applied to mains connections and grounding of the switch mode supplies to safety earth.

The supplies are Audio Power DPA500 S-D, you can also see the additional capacitor board AP kindly provided me as a gift for slow delivery. As configured this provides another 4,000uf per rail of filter capacitors for the high current supplies, there is additional space for another 1,000uf per rail, but I wanted to be sure the supply was fine with a more conservative addition first.

So far I am delighted with the sound and it is virtually completely silent as long as I don't connect my sub woofer which appears to create a ground loop.

I would like to be able to bias the amps further into Class A but the DPA500 won't allow it on start up. Nevertheless the amp sounds better than when wired into my previous monoblock amp chassis. These had a 300va transformer per channel for high current and a 60va transformer per channel for the driver stage supplies. These supplies had a dual secondaries per transformer, electrostatic sheilds and Jensen 4 pole capacitors.

Regards,

Rob.
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Last edited by Robert F; 19th July 2013 at 12:31 AM.
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Old 19th July 2013, 09:35 PM   #2170
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Hello, sometimes it seems that something is moving on this thread..

I'd be curious to know what happened to everyone else with the DPS-600 GB
...I hope it went well.

@ Robert-F: I see cables delicious in the assembly, as well the vertical mounting of the two DPS-500.
From the picture I see you have the "S" version, this includes the remote control, you have not used? works well and is easy with 2-Pin, just "open / close".
The connector (CN4) is located near the vertical module.
As the DPS-600, this remote control in accordance with EEC regulations, has a very small absorption and can keep the stby for a long time.
maybe you can replace the switch on the front, with a circular 23mm diameter with double switches (one for each remote control).
For additional filtering capabilities, 5000uF per side is the maximum stated on the datasheet, I think you'll have a timbre very dry, especially on percussion hehe!
thanks to Qusp for the support

Congratulations to Opc for new projects.
regards
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