Destroyer x Amplifier DX HDII version. - Page 27 - diyAudio
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Old 28th October 2007, 06:55 AM   #261
Harry3 is offline Harry3  Australia
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Hi Nordic,
can you confirm if the trimpot is 5K or 10K? There are some posts that suggest that it is 10K.
Thanks for all the hard work.
Harry
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Old 28th October 2007, 06:59 AM   #262
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Quote:
Originally posted by billabong
We're an adventureous lot down here, with a long history of exploration.
That was funny!
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Old 28th October 2007, 07:56 AM   #263
Nordic is offline Nordic  South Africa
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Hi Harry, allthough my prototypes worked successfully on 5k trims there, Carlos built a few units more, and recommended we change up to the 10k value, as he had to turn some of his closer to 6k...
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Old 28th October 2007, 01:45 PM   #264
Nordic is offline Nordic  South Africa
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Also if you try the version without the regulators, you will need the 10k to adjust offset.
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Old 29th October 2007, 12:34 PM   #265
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Default input impedance and sensitivity

Hi Nordic,

sorry that I have to post this in here... cause the original thread from Carlos has been very long... and I believe he is busy working on the next generation DX...

do you know what is the input impedance of the HDII version?

this is important for me since I need to calculate line level notch filter that I like to experiment with...

also, what is the input sensitivity of this amp? (or gain actually? with recommended power supply voltage?)

I wonder if using simple passive preamp just a pot like my gainclone would work... (my gainclone with +/- 25VDC PSU has pretty sensitive input at 0.6Volt so I can easily use just a pot for passive "preamp")

Regards,
---
David
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Old 29th October 2007, 01:19 PM   #266
Nordic is offline Nordic  South Africa
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Unfortunately my meter goes only to 2Meg ohm... not enough to measure for you... just post in the DX thread, Carlos checks it, and will gladly provide the info.

The board factory just phoned, they would have been done allready, but apparently the board v-scoreing machine got stuck... guess they are not dealing with such big orders every day.

They said I can collect tommorrow morning.

I am now going to send off PSU boards to the fab, I redesigned the PCB to take 35mm caps as I would later, when finances allows for it, like to install Sikorel caps there... will just have to manualy drill holes for the 13mm nuts on those. In the meantime it accepts standard 10mm snap in caps. Low ESR units are commonly available in 35mm.

I expect the price to be about the same as the amp boards, allthough it may differ a little due to the smaller order.

I will request qoutes on 1 and 2 oz, but I think 1 oz is more than enough considering trace widths.

I guess going on past experience, these won't be ready before Tuesday.

Let me know if you are interested, and want to keep your order so both orders can ship together.

As always, a PSU is not a cheap item. this is my first amp I feel deserves some good caps (>$10 each) (my prototype is working happily on $2 caps in the meantime).
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Old 30th October 2007, 01:18 AM   #267
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Hi Nordic,

Very nice PSU PCB. Check your thermals.

regards
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Old 30th October 2007, 07:57 AM   #268
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Nordic,

You have mail.

Put me down for two PSU boards.

Thanks.
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Old 30th October 2007, 08:29 AM   #269
cwujek is offline cwujek  United States
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Do you need two PSUs for each stereo pair? Or just one? I'll take enough PSU boards for two stereo pairs....Thanks,

Chris
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Old 30th October 2007, 08:35 AM   #270
Nordic is offline Nordic  South Africa
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Thanks B.

Greg, care to elaborate?
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