Beresford Bushmaster DAC Reviews

I fancy trying the S-Booster thingy - can't find it on the MCRU site - can someone give a linky? :)

http://markgrantcables.co.uk/shop/in...yword=sbooster

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http://markgrantcables.co.uk/shop/in...roducts_id=411

Ta! ... which explains why I couldn't find it on the MCRU site. :doh:

... ordered ... although I couldn't resist going for the full linear PSU instead! :scratch: :)

Hi Dave , can you please tell me the RAM of your laptop. Also is this a Teralink X2 USB TO SPDIF converter.If it is how do you rate it .
Thanks
Brian.

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Originally Posted by MartinT

Cheap Chinese charger. What can I say?

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You don't know how right you are based on my experiences over the years with the orient! :)

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Originally Posted by Mains Cables R Us

The second regulator is supplied with a clean low noise supply, and its job is to handle the changing demands of the load. To do that, it needs to be as close to the load as possible. So we remove the second regulator from the main box, and place it close to the load, both electrically and physically, that removes it from the noise and interference of the mains supply, and allows it to spend its time looking towards the load. Typical commercial voltage regulator chips are general purpose devices, but are not quiet enough for the task on hand, so the second regulator uses a bespoke regulator based on a low noise multi stage filtered voltage reference, a low noise error amplifier and a high current low resistance mosfet. To allow it to handle the changing load it also needs to supply current on demand, so all the remaining space in the second regulator is filled with low impedance capacitors to act as a local energy source.

Using the two stages of regulator, we achieve a noise floor equal or better than most battery supplies, and a effective source resistance of the order of 0.02 ohm (and the short cable run to the load avoids increasing this valve by adding copper where its not needed, and the use of a discrete regulator design allows that tiny value to be maintained way above frequency any audio device operates at.

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so could this second regulator box be added to existing linear PSU's and if so would you consider selling them? (and for how much?)

No, its not just a passive in line filter, there are two voltage lines into the second reg. Sorry.

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Originally Posted by MartinT

.... as the charger failed while I was trying to put a full charge into the battery to start tests.

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Fook. My cheapo Chinese battery charger has given up the ghost, too. :doh:
I don't think I'd have used the battery again after seeing the Doomsday Video of what can happen with the things anyway. :mad: :wowzer:

Mucho looking forward to receiving a couple of linear PSUs (12V & 15V) from the estimable Mark Grant today, hopefully. :carrot:
Thanks Mark, it was fab of you to phone & discuss. :thumbsup:

Yes, I wasn't too happy with the HK sellers and suspect they have epidemic failures as they gave me a partial refund for the charger. The battery is not much good on its own and has gone into the parts bin in the garage to consider its future.

Mine still works fine. But I shall do a read up on li-on and li-po charging requirements. If I can incorporate a secure charging process inside the BM firmware code that could be a handy feature to add.