Search found 5487 matches

by jack
Wed Aug 16, 2017 7:04 pm
Forum: Everyones Projects
Topic: Balanced Power Supply
Replies: 198
Views: 92771

Re: Balanced Power Supply

Looking good!

"Cressy Snr
Oooo, Roberts Radio's sound nice"

Indeed they do. The R66 from 1957 is one of my favourite sets :)
by jack
Wed Aug 16, 2017 6:55 pm
Forum: Assorted Stuff
Topic: Nothing In Particular
Replies: 16439
Views: 4650480

Re: Nothing In Particular

This is really interesting. I used a lot of gate drivers in my Tesla Coil days, but they were all two-state, on or off, never linear. High Qg in low RDSon high voltage FETs were always a bitch to drive, so I tended to use either Maxim devices or the ubiquitous UCC36321/2 chips. For HV isolation we u...
by jack
Wed Aug 16, 2017 9:41 am
Forum: Assorted Stuff
Topic: Eagle is now subscription-based...
Replies: 4
Views: 3297

Re: Eagle is now subscription-based...

Its down to inertia and the cost in time getting used to another toolchain. Completely agree. I still believe that the right technical decision is to go to CircuitMaker, but lack of bandwidth to manage the transition means I just paid the money to Autodesk for 1 year's Standard license - I used to ...
by jack
Sun Aug 13, 2017 5:05 pm
Forum: Assorted Stuff
Topic: Eagle is now subscription-based...
Replies: 4
Views: 3297

Re: Eagle is now subscription-based...

So you've stuck with Eagle... I'm still 50/50 staying Eagle or going Circuit Studio... CS allows you to import all your Eagle stuff and have access to all of Altium's huge component catalogue.... supposed to be quite intuitive to use, but, hey, anything is intuitive compared to Eagle.... There's a b...
by jack
Sun Aug 13, 2017 2:37 pm
Forum: Assorted Stuff
Topic: Eagle is now subscription-based...
Replies: 4
Views: 3297

Eagle is now subscription-based...

Not sure how many folk here actually design PCBs, but... ...as all Eagle users will know, Autocad acquired Eagle from Premier Farnell at the start of the year and Eagle 8, the new version, has a completely different licensing model - it's now subscription based, starting at USD 15/pcm for the "...
by jack
Sun Aug 13, 2017 12:43 pm
Forum: Assorted Stuff
Topic: Nothing In Particular
Replies: 16439
Views: 4650480

Re: Nothing In Particular

Our main dog (a German Shorthaired Pointer) used to try to KILL our cats when we first got it. On the point of taking it back to the rescue centre when a friend suggested a "dog whisperer" - a ex-City-of-London Police dog trainer. 3 hours later, the pointer wouldn't even look at a cat - if...
by jack
Sun Aug 13, 2017 10:02 am
Forum: Everyones Projects
Topic: mosfet biasing
Replies: 21
Views: 9161

Re: mosfet biasing

Nick wrote: Sat Aug 12, 2017 10:37 pm On a similar subject, I saw this the other day, which is a good thing IMHO,

http://www.linearsystems.com/lsnews/lsj689.html
I noticed that some of their JFETs appeared in the native libraries of LTspice a while ago... nice devices...
by jack
Fri Aug 11, 2017 3:43 pm
Forum: Everyones Projects
Topic: 6B4G - The Resurrection Shuffle
Replies: 414
Views: 161015

Re: 6B4G - The Resurrection Shuffle

This was such a cool project, so glad it's time for round two...

Shunt reg this incarnation ?
by jack
Mon Jun 19, 2017 3:33 pm
Forum: Buying and Selling
Topic: Good Grief!
Replies: 3
Views: 2350

Re: Good Grief!

I'm about 4,000 miles too far South :)
by jack
Mon Jun 19, 2017 2:53 pm
Forum: Buying and Selling
Topic: Good Grief!
Replies: 3
Views: 2350

Good Grief!

Anyone need an isolating transformer (or two):

http://www.ebay.co.uk/itm/29-x-Farnell- ... SwGJlZL-St
by jack
Mon Jun 19, 2017 10:40 am
Forum: Assorted Stuff
Topic: Nothing In Particular
Replies: 16439
Views: 4650480

Re: Nothing In Particular

Maybe but This is what I wrote and I wrote it in 1992 - "Litz cables are two coated (insulated) wires, one positive the other negative, woven together, which ends up having very high capacitance. This creates a virtual short circuit load on the amplifier at very high frequencies". Maybe s...
by jack
Mon Jun 19, 2017 4:38 am
Forum: Assorted Stuff
Topic: Nothing In Particular
Replies: 16439
Views: 4650480

Re: Nothing In Particular

First part - because you said it didn't effect audio frwequencies, pretty basic and important mistake. No I didn't. Not at all. I said that the effects, which I quantified, were negligible. Please don't try to twist my words to suit your argument. By presenting my​ reasoning, others can make up the...
by jack
Mon Jun 19, 2017 3:09 am
Forum: Assorted Stuff
Topic: Nothing In Particular
Replies: 16439
Views: 4650480

Re: Nothing In Particular

EDIT - not all of it, Jacks contribution was just uninformed. Note below how it registers my edit. Just for my own elucidation, so I can improve and be a better person in future, where was I factually wrong in my post about Litz wire? Just stick to facts, please. Litz cables are two coated (insulat...
by jack
Sun Jun 18, 2017 8:55 pm
Forum: Assorted Stuff
Topic: Nothing In Particular
Replies: 16439
Views: 4650480

Re: Nothing In Particular

Not sure what I wrote was pathetic. It was, though I say myself, carefully reasoned and factual.

Sticking to bollocks (bleugh!), here is another interesting fact::

The word Avocado comes from the ancient Aztec Nahuatl word for a monorchid - a bloke with one ball.

Makes sense, really.
by jack
Sun Jun 18, 2017 5:23 pm
Forum: Assorted Stuff
Topic: Nothing In Particular
Replies: 16439
Views: 4650480

Re: Nothing In Particular

FWIW, I only remember one instance of the word "bollocks". This raises an intriguing though perhaps futile semantic point. Can you ever have one "bollocks"? You can definitely be a monorchid and have just one "bollock"... but "one bollocks"? No. Surely not. .....