Search found 3981 matches

by Andrew
Sun Nov 12, 2017 12:27 pm
Forum: Speakers
Topic: MY own OB speaker project
Replies: 74
Views: 1690

Re: MY own OB speaker project

Some further minor upgrades with the 3-ways. Yesterday I drilled holes in the centre baffles and installed the T90A super tweeters. I machined the holes such the tweeters would be gripped in place with 3mm thick 'O' rings. For those that can remember the Sachiko speakers I built for Andrew, Phil ma...
by Andrew
Tue Nov 07, 2017 8:25 pm
Forum: Speakers
Topic: MY own OB speaker project
Replies: 74
Views: 1690

Re: MY own OB speaker project

Everything everyone else said +1, except to add my thanks to Colin (and Lynne) for hosting an excellent weekend.

Those co-axial drivers are every interesting......
by Andrew
Wed Jul 19, 2017 10:13 pm
Forum: Beginners
Topic: CC Source in a Spud?
Replies: 86
Views: 2747

Re: CC Source in a Spud?

Be interesting to hear which you prefer CCS or choke, both have their advocates, advantages and compromises.

The great thing about a Spud, for me, is it's so easy to try different stuff and see what floats yer boat.

Andrew
by Andrew
Sat Jul 15, 2017 6:46 pm
Forum: Beginners
Topic: CC Source in a Spud?
Replies: 86
Views: 2747

Re: CC Source in a Spud?

Yes, Nick's right, it was wound for parafeed, hence no gap, so more inductance and hopefully better bass.

The 6C45 was shunt regulated too.

Andrew
by Andrew
Sat Jul 15, 2017 4:02 pm
Forum: Beginners
Topic: CC Source in a Spud?
Replies: 86
Views: 2747

Re: CC Source in a Spud?

No input TX, 6C45 was CCS loaded into a para-fed and gapless output TX.

hope that helps.

Andrew
by Andrew
Thu Jun 01, 2017 1:32 pm
Forum: Assorted Stuff
Topic: Audio Talk meet Owston, Doncaster, 10&11 june 17
Replies: 316
Views: 13685

Re: Audio Talk meet Owston, Doncaster, 10&11 june 17

Me, Saturday, please. I believe think Colin will be joining us too.

Andrew
by Andrew
Tue May 30, 2017 8:52 am
Forum: Beginners
Topic: who would build me a Geddon clone ?
Replies: 11
Views: 853

Re: who would build me a Geddon clone ?

Linn's Valhalla doesn't have a transformer, its "off line", which saves on both cost (to Linn's benefit, I suspect) and eliminates a source of radiated EM noise as the Valhalla board goes under the platter; 33 only. Someone does a modern clone of the Valhalla, that does both 33 and 45, again its off...
by Andrew
Tue May 09, 2017 12:47 pm
Forum: Speakers
Topic: Alpair 12P vs 12PW
Replies: 21
Views: 1808

Re: Alpair 12P vs 12PW

My favourite full ranger, that's for sure.

Andrew
by Andrew
Thu Apr 20, 2017 7:13 pm
Forum: Everyones Projects
Topic: My take on a heater supply...
Replies: 51
Views: 2877

Re: My take on a heater supply...

No block diagram as travelling, but three key stages: ideal rectifier, SMPS pre-regulator, final ultra-low-noise linear regulator. Programmable slow-start and shutdown, opto-isolated enable input and power good out (for daisy​-chaining). That makes a lot of sense as a block diagram, thanks. Opto is...
by Andrew
Tue Apr 18, 2017 9:18 pm
Forum: Everyones Projects
Topic: My take on a heater supply...
Replies: 51
Views: 2877

Re: My take on a heater supply...

A postfix linear regulator (or buck-boost pre-regulation) neatly addresses most of these compromises, but it's very hard to get the balance right... Hi Nick, I'm a bit unsure of what you mean here by postfix and pre-reg, could you elaborate, please? I think I have a picture in my head of what you'r...
by Andrew
Sat Apr 15, 2017 6:44 pm
Forum: Everyones Projects
Topic: My take on a heater supply...
Replies: 51
Views: 2877

Re: My take on a heater supply...

jack wrote:
Wed Apr 12, 2017 3:21 pm
Seems that I can only add three attachments to a post, so here is an LTspiceXVII simulation run of the ramp gen - the output current of the board follows this precisely.
Hi Nick,

Couldn't you use a buck-boost switcher that has a ramp generated slow start on it?

cheers,

Andrew
by Andrew
Sun Apr 09, 2017 7:40 pm
Forum: Assorted Stuff
Topic: Hot and dry holiday destination.
Replies: 167
Views: 7460

Re: Hot and dry holiday destination.

shane wrote:
Sun Apr 09, 2017 2:18 pm
Mornington Crescent!
Seems you win, Shane. My money was on Dave, but you snuck in.
by Andrew
Sun Apr 09, 2017 1:13 pm
Forum: Assorted Stuff
Topic: Hot and dry holiday destination.
Replies: 167
Views: 7460

Re: Hot and dry holiday destination.

Auchtermuckty?
by Andrew
Sun Apr 09, 2017 9:05 am
Forum: Assorted Stuff
Topic: Hot and dry holiday destination.
Replies: 167
Views: 7460

Re: Hot and dry holiday destination.

Malta?
by Andrew
Sat Apr 08, 2017 10:47 am
Forum: Assorted Stuff
Topic: Owston meet 2017 10th june?
Replies: 75
Views: 4423

Re: Owston meet 2017 10th june?

jack wrote:
Wed Mar 29, 2017 3:02 pm
cressy wrote:
Wed Mar 29, 2017 2:40 pm
Tracey who runs the shop...

PS. Yes, I know that two of the eleven Chunnel TBMs were called Sharon & Tracey. The Americans had one called Brenda.
What about Faith, heard she can move mountains ;)