Destroyer x Amplifier DX HDII version. - Page 37 - diyAudio
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Old 26th November 2007, 04:55 AM   #361
es44 is offline es44  Denmark
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Default Re: Re: BIG power trannies on eBay for your HRII

Quote:
Originally posted by cwujek


I wonder how suitable these are with given that they are meant for 50hz operation....
They will be happier running 60Hz. It would have been worse the other way round.
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Old 26th November 2007, 06:41 AM   #362
Nordic is offline Nordic  South Africa
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Lol you ca nbuy it and send it to me for christmas, we hum at 50 Hz down here...
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Old 26th November 2007, 08:02 PM   #363
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Smile Re: Remember to tweak the rail regulators

Carlos,

Thanks for your very helpful reminder.

If I use the transformer mentioned above with 120VAC input I should end up with 40VDC at idle, if it runs according to specs. So I will replace only the rail regulator zener references

But I also plan to build a HRIII later - for that I will connect our 120VAC power to the 100VAC input on this 1KVA transformer. We actually get 125VAC from the wall plug, so I should end with about 50 VDC. I will have to figure out how many power transistor pairs I need then, and do all the tweaks you mentioned, or just use your HRIII schematic, and Nordic's new board (?) for it.

Thanks for initiating all this fun!

Francois

To Nordic:
Jammer man - die ding weeg te veel vir Vader Kerfees se trip na RSA
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Old 27th November 2007, 04:38 AM   #364
SamL is offline SamL  New Zealand
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Hi Nordic,

The pcb and transistors arrived in good condition. Excellent labeling and packaging.
Don't think I'll be able to start building until next year. Busy with my new DAC and is about to start tearing down a bedroom.

Many thanks for taking this on. Most appreciated.

Sam
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Old 27th November 2007, 01:14 PM   #365
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Default North American courier batch boards

Ed LaFontaine, old buddy, could you update update us on the batch of boards you will be distributing in North America. Should we expect our boards soon?

Thanks,
Francois
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Old 27th November 2007, 01:17 PM   #366
Nordic is offline Nordic  South Africa
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Hi the ETA in the states is roughly on Monday....

Oh about that transformer, you can't use it in 60Hz zone... you can use a 60Hz tranny at 50Hz, but you need to derate output by about 10%.
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Old 27th November 2007, 02:08 PM   #367
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Default For all US recipients

A timely question...and a quick response...Thanks Nordic, the packages will be addressed and waiting for the goods to arrive.
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Old 27th November 2007, 08:46 PM   #368
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Default Hello folks!... in special for Nordic, i have tested the HRII with the MP3 player


I perceived sounded better with i install a load to the player..the 33 ohms resistance .... one to each channel.

Also my player had noises when playing into very low levels...the capacitor killed the noises.

Observe the gain resistance, 220 ohms because of the player low output level.

regards,

Carlos
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File Type: gif nordic...your player.gif (8.9 KB, 341 views)
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Power supply; ripple, filter, noise, stability and the use of capacitance multiplier... Portuguese and English; https://www.youtube.com/watch?v=sSm0ku1eIgg
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Old 29th November 2007, 08:27 PM   #369
konkret is offline konkret  Germany
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Default Boards

Hello Nordic,

today I received the boards in good shape
- kind of a first Christmas present.
Thank you very much!

----------
konkret
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Old 30th November 2007, 07:18 AM   #370
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Default Boards arriving..... very good..thank you Nordic


regards,

Carlos
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File Type: jpg feel good.jpg (89.2 KB, 275 views)
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Power supply; ripple, filter, noise, stability and the use of capacitance multiplier... Portuguese and English; https://www.youtube.com/watch?v=sSm0ku1eIgg
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