COP 17 Heater | Rosemary Ainslie | Part 2

[witsend]

Rosemary, this must be very good news for you after such a long battle! Congratulations!
You must have new measurement results soon now. I can’t wait to see them!

Cheers,
B

THANKS BART for the kind wishes. Results are still some way away. We're still designing the various options required for testing and the problems are all related to the switch. It's a tricky one. But we've got no end of 'brains' dealing with the subject. SUCH A PLEASURE.

By the way. I've been discussing something with Donny. There's a possibility that a small 'gap' in the winding adds capacitance to the resistor. I don't see any gaps in your winding and nor in Ash's and, interestingly, it was also omitted in Aaron's. That added capacitance may be a good thing. Not sure if Glen's windings included that gap. Can you check on this? Our's definitely did. And as I mentioned - it may prove to be required. You could run a test with close winding and then compare? And as another thought. Can you use glue to anchor the wiring? Or is that too messy? I'm due to meet with the 'resistor manufacturer' during the course of this week. I'll see if I can get some tips from him. I'll also get some more wire if he still has this.

Take care of yourself Bart and thanks again.

[b4FreeEnergy]

Not sure what you mean with that small ‘gap’. The windings are not touching each other so there is a gap of about the thickness of the wire in between each winding anyway. (The wire is not isolated and there is rope in between the windings to keep them apart)
B

[witsend]

Not sure what you mean with that small ‘gap’. The windings are not touching each other so there is a gap of about the thickness of the wire in between each winding anyway. (The wire is not isolated and there is rope in between the windings to keep them apart)
B

Then that's perfect. Just wasn't sure as it's difficult to see. What I should have said is that it's difficult for ME to see. Which is a euphamism for being more than half blind.

By the way. I solemnly promise to take copious photographs of all stages of these new tests. I'm still learning but nearly there. But we're still a week or so away from actually getting onto the lab site. So excited. I've been boring family and friends about the development.

[b4FreeEnergy]

I've been boring family and friends about the development.

Difficult to imagine!
And yes I need a better lens for close distance pictures. It's not sharp, you are right.

Cheers,
B

[witsend]

Difficult to imagine!

LOL

And yes I need a better lens for close distance pictures. It's not sharp, you are right.

Cheers,
B

No. It's my eyesight - or lack of it. I still see smudges unless I do some major adjustments of my lenses/glasses and whatnots. You mention that you've got tape over it. Can't see the tape. I do, however, see a distinction between the glass and the more silvery winding. But that's about it. Am somewhat visually challenged Bart. NOTHING WRONG WITH YOUR PHOTOS. And clearly nothing wrong with the winding.

[b4FreeEnergy]

72€ for 0.25 Ohms ...

Guess what, I just tried to buy that 0.25 Ohm series resistor locally and they would charge me 72€ for it! For one resistor!! Why is nothing in this little circuit ‘easy’? Do I have to offer some sheep first to get the Capitalism Gods in a good mood?

Putting 6 ‘cheap’ power resistors of 1.5 Ohms in parallel looks at least a little bit ridiculous I guess.

Cheers,
B

[witsend]

Guess what, I just tried to buy that 0.25 Ohm series resistor locally and they would charge me 72€ for it! For one resistor!! Why is nothing in this little circuit ‘easy’? Do I have to offer some sheep first to get the Capitalism Gods in a good mood?

Putting 6 ‘cheap’ power resistors of 1.5 Ohms in parallel looks at least a little bit ridiculous I guess.

Cheers,
B

Those highly calibrated carbon numbers do cost, unfortunately. I personally see nothing wrong with resistors in parallel and you will note that Glen's early tests were not based on these zut little shunts. From memory I believe he used a standard wire wound number. The differences between the two were negligible. Certainly not more than 5% which, in any event, is an acceptable range for error margins. But I don't think he needed to parallel them. He simply used one. Precedents were also set by TK who used two 0.5 Ohm wire wounds - in parallel.

LOL No need for the sacrificial lamb.

[Groundloop]

@b4FreeEnergy,

I did use a MP930 non-inductive resistor mounted on a small heat sink.

It did cost 5.08 Euro. I got it from:
https://www1.elfa.se/elfa3~eu_en/b2b...hop=ELFA_EU-EN

Regrads,
Groundloop.

[b4FreeEnergy]

Ordering components

@Groundloop

Thanks for this link Groundloop, this was what I was looking for. This is now at least and at last a fair price I guess.

Cheers,
Bart

[b4FreeEnergy]

Those highly calibrated carbon numbers do cost, unfortunately.

Ok but the price has to stay decent!

LOL No need for the sacrificial lamb.

I wouldn't hurt those poor animals!

[witsend]

Hi B. I agree with you. Prices for these things are crazy - and from what your suppliers charge - it makes no sense at all.

Do hope you get sorted out. But if not, I'm sure you can just use a wire-wound number. I wouldn't worry that much. If it's out at all it's by a neglible amount. Glen's tests showed this.

EDIT btw - the part that Groundloop has sourced - looks more doable. Thanks for the input there Groundloop. And what a nice photo. That's a high standard to follow. I'm on a bit of learning curve here. Not quite managing that level of clarity. Persumably it can only get better. LOL

[b4FreeEnergy]

High standard photo's

This is indeed a sharp photo and that was what I meant with mine not being so sharp and I needing a better lens on my camera.
You could indeed start practicing and post us a few nice pictures. The South-African scenery is no doubt beautiful and could be a first shot but after that … a nicely portrayed resistor maybe?

Mazzeltov,
B

[witsend]

This is indeed a sharp photo and that was what I meant with mine not being so sharp and I needing a better lens on my camera.
You could indeed start practicing and post us a few nice pictures. The South-African scenery is no doubt beautiful and could be a first shot but after that … a nicely portrayed resistor maybe?

Mazzeltov,
B

LOL B. I'll get there!! WATCH THIS SPACE. I'll do so many you guys will get bored. But I'm not there yet. Still awaiting schooling in photobucket. No natural aptitudes here Bart - unfortunately. I use my eyesight as my excuse. But am not sure that cuts it.

[Groundloop]

Bart, Rose,

I'm a amateur when it comes to photographing. LOL

But I have learned to use enough light on the object and
keep the camera still when taking a photo. Also most new
digital cameras have a macro function that allow you to
hold the camera close to the object. This helps a lot.

(Sorry for the off topic post.)

Regards,
Alex.

[witsend]

Bart, Rose,

I'm a amateur when it comes to photographing. LOL

But I have learned to use enough light on the object and
keep the camera still when taking a photo. Also most new
digital cameras have a macro function that allow you to
hold the camera close to the object. This helps a lot.

(Sorry for the off topic post.)

Regards,
Alex.

Will have to look for that function. I'm afraid that I'm widely accused of not keeping photographic record. Probably justifiably. I intend putting that reputation to bed. But - so far - it's just intentions. I'm getting better at the video numbers though. But your pictures are great Alex. A tough act to follow.

Certainly not off topic. On the contrary. Any record keeping is always topical.