COP 17 Heater | Rosemary Ainslie

[Harvey]

Your combined charge and discharge time sets the frequency. The smaller the capacitance, the higher the frequency. The duty cycle is the ratio between the on and off time. Increase the resistance in the inner leg and decrease the resistance in the outer leg to improve that separation. With a narrower on time and a wider off time but the total time = 2.4KHz you can approach the desired 3.7%. The stock 555 has a frequency limit near 1Mhz (1uS total time) if IIRC - I need to look it up - but that is well faster than your required range. A 15.2μS on time and a 402.9μS off time should give you ~3.7% @ 2390Hz

Cheers,

[sprocket]

Quick update. I found what seems a good ebay source for PG50's for us europeans - $4.00 US, with a very reasonable $5.80 P&P. eBay Store - Hyperfine Store: Transistors, Integrated Circuits, Diodes - I've ordered 5 so will let you know how it turns out.

While waiting for my mosfets, I decided to try out a couple of BU208 high-voltage bi-polar transistors in Darlington configuration and was quite pleased with the result - very good sink-time at all frequencies, though they have nowhere near the current handling capability of the PG50's. Rated at 1500V BE, they should also hold up pretty well to spikes.

@Aaron - interesting to read that it's the "original" Ainslie circuit that only seems to produce the aperiodic waveform. While my BU208 circuit seems to produce a far better signal than my lone PC50 mosfet did, try as I might, I cannot get it to do anything unusual - so I'll probably knock up the original circuit tomorrow. I didn't see the point till now as my function generator can easily produce waveforms with a M/S ratio of 0.5%, but maybe there is something 'different' going on with that circuit! Only one way to find out...

PS - just realise those pics. take up quite a bit of space. I need to reduce the resolution a bit!...

[Harvey]

I played around a bit with the timer circuit in Falstad's Circuit Simulator and ended up with the following proposed changes. I haven't built the circuit yet to try it, but it did make sense to make these alterations.

The results should offer duty cycles between 1 and 50 percent and frequencies between 1.8KHz and 2.5KHz. I found the 0.047 microfarad cap problematic and the 5.2K resistor unecessary if the discharge connection is moved to the other side of the fixed resistor. The 5.2K resistor was limiting the minimum ON time.

[witsend]

Guys. I've taken the trouble to read through the early chapters of this thread. There have been a welter of posts since then - but the general theme has not changed. TK is still complaining about the very phenomenon that our switching circuit seems to generate. I have answered just about every question he has addressed in my first post to him - 164. And true to his bias, or perhaps because of a lack of general talent - he is determined to overlook this. The very questions that related to the switch is also the precise point where his attention should have been focused.

Therein is my real question as to his objects in this exercise. His objections have trawled through this thread and his own with a dreary monotony that's the inevitable affliction of the dull-witted. But to add colour to to this monotous background drum beat he ocassionally spices his language with a certain colour and his delivery with a certain energy that definitely lend his writing a certain jazzy entertainment value. It seems that I am the brunt of that wit. Glad to oblige, provided always that the wit stays evident, and that observations are seen for what they are. Just distractions. Not meant to be taken in good faith. Latterly, however, he has also relapsed into a sort of pompous self-righteousness that is usually the afflication of the newly converted. It's one thing to be a paid troll. It's an entirely different matter when the troll is deluded into thinking he's serving humanity.

Fortunately 'trolling' has a second advantage. It amuses the public and throws doubt on the fundamental objects of that troll - both. He has served us proud here. He has focused attention on the claims in the circuit - and yet also paraded his bias with the clumsy self-assurance of the truly self-opinionated. Had he disguised this attack with an appropriate circumspection - he may well have done damage.

Where we're at? That's the comforting part. We've rescued the 'effect' that TK complained about so petulantly - and we now have contributors who are prepared to investigate this effect more comprehensively. I have no idea what will come out of their findings - but am more than happy to sit back and see. I've said this before but would like to re-iterate. If the findings are in line with our own, then I think we've got enough 'meat' for Jibbguy and others to act on. If we have something that is 'questionable' - but not in line with our findings, we may yet have the material to deliver another paper. And if, on the other hand, no benefit is evident, then I must apologise to you all for wasting your time. Hopefully the 'trip' was at least entertaining and, dare I say it, quite challenging. I've had more fun on this forum than I've had in a long time. But, by the same token, I've also had less. I just need to remind myself that TK and his 'thugs' are really just nameless personae that happen to thrive in this strange universe of the forum and the internet. And their only object is to damage others as their own self-esteem is so badly bruised by the certain knowledge of their mediocrity.

[Harvey]

I recall a story of two young teenagers who went rock hunting on a field trip. They fought the whole way there arguing everything under the sun. Then they both spied the same rock, both reached for it together and neither would turn lose of it. So they sat together on the ride home, never turning lose of that rock, in silence. Upon reaching the school, they sat together in class not turning lose. At the end of the day, they rode the bus home, neither letting go and exited the bus together, walked to the girls house first on the path and finally had to make a decision. Whoever keeps the rock has to take care of it and not let it get stolen, the boy said. I have a lock box and key she said, but you can come see it whenever you like.

Sometimes the battle has very little to do with the rock, it just provides the means to hold hands for half the day.

[witsend]

Harvey, many thanks for the proposed changes.

I see you're looking for those MOSFETs. I can get them for next to nothing. For some reason they're cheaper in SA than anywhere. I'd be very happy to post this. You need to email me a post box or some such? Be glad to oblige - just in the interests of getting your testing done.

Rosemary

[Harvey]

Harvey, many thanks for the proposed changes.

I see you're looking for those MOSFETs. I can get them for next to nothing. For some reason they're cheaper in SA than anywhere. I'd be very happy to post this. You need to email me a post box or some such? Be glad to oblige - just in the interests of getting your testing done.

Rosemary

EDIT By the way, have just seen your post. I really do not want to hold hands. Good heavens. What a thought.

I don't know what to say...such a generous offer from both of you, but intercontinental shipping is quite prohibitive - I should try and find them here locally if possible first - in the event I cannot locate them, then I may have to take up the offer. - Just checked, looks like Digi-key has them, single qty $8 US.

Thanks

[witsend]

I don't know what to say...such a generous offer from both of you, but intercontinental shipping is quite prohibitive - I should try and find them here locally if possible first - in the event I cannot locate them, then I may have to take up the offer. - Just checked, looks like Digi-key has them, single qty $8 US.

Thanks

good stuff. Just as long as there's no excuse to doing the these tests. Am truly delighted. Like I said, I'm inclined to trust your evaluation. Many, many thanks.
Rosemary

[witsend]

Wistend i agree with, that the Output from the Timer depends at the Load.
I saw the Waveforms different at a Coil or a Heating Element.
Seems there depends more at the Signal, what comes in...

When there is the right Amount of Energy in, you can get a certain Amount back, where it depends at the Setup, how much this will be.
Each Load has a certain Point, where it resonate.
Mainly you need first to find this Point over the Dutycycle and the Frequency.
You can try it with a bigger Coils, it seems it s more better to see there,
because it is easier to find the Point.
About the Heat, it is created from the Energy, what moves through the Lead.
You can put a balance there, like a Resistor, and can move the Point around, where the Heat appears.
I could figure a Setup like 2 Coils and at the middle a heating Element, that you can move more Energy through the Circuit.
But maybe it works with Caps at the same Way.

Hi Joit. It seems that the Quantum switch is critical to this effect. I'm hoping someone will explain the 'difference' between this and standard switching. I agree that the heat is a function of the current, if that's what you're saying. And I definitely agree that added inductance also adds to the effect. But the beauty of this circuit is that it's fairly simple to analyse - in as much as any circuit is simple.

And I have never used caps. But Peter has really good results from this.

Always nice to see you around.
Rosemary

[poynt99]

Mirror mirror...

And I definitely agree that added inductance also adds to the effect.

I did just that at OU. The energy return to the battery when this is done is clearly shown. It's analogous to Harvey's mirror (but no doubt he will contest this) in that we're sending a beam of light into a mirror that is only about 86% efficient. 14% of the beamed light energy is "absorbed" by the mirror (load resistor, MOSFET, shunt), and 86% is reflected back and re-absorbed into the light source. This is precisely how this circuit works.

But the beauty of this circuit is that it's fairly simple to analyse - in as much as any circuit is simple.

.99

[witsend]

For TK

No such thing as an expensive fake Persian. It's easy to tell the difference between the two. The fake doesn't last the distance. And Poynt is not a 'token sceptic'. He's just begging for the the prestige he thinks is associated with being expelled.

And all that mud TK? You'd know. You've been scraping it off your feet and throwing it in our general direction for just so long. It's sticking but I'm enjoying a mud bath here. And I would not describe Harvey as the merchant tradesman 'sceptic' - more the expert resident engineer checking on structural weaknesses.

I might add that I came forward with an offer of the FET because I had a shrewd idea you would not follow through with your offer. You only wanted him to discover the flaw in the design. Not the benefit. I'm rather looking to the latter.

And if you're finding your pickings lean - then it's probably because you're not opening your eyes to what's actually on offer. For that you need the liberal use of your Fluke 123 and all its functions. How about it TK? Just one video and exclusively with probes across the shunt - at the 3% you now claim you can get.

[poynt99]

And Poynt is not a 'token sceptic'. He's just begging for the the prestige he thinks is associated with being expelled.

Not so. Shame that's your impression.

.99

[thaelin]

On the mud bath

Witsend:
It is said that he who slings the most mud is losing ground.

I had to stay silent in here but have been a faithful reader. In the end, is seems that things will prove out. I have had little way to help. Due to bankruptcy and the loss of the rest of my family, I have been busy other places. I can start to play now.
I have been on OU.com and it seems where ever TK goes, the story is the same. Told me the same thing but thats another story for another thread. Soon. The controller circuit will be of help to me so have reason to build it. Parts on order this week.

thaelin

[witsend]

Witsend:
It is said that he who slings the most mud is losing ground.

I had to stay silent in here but have been a faithful reader. In the end, is seems that things will prove out. I have had little way to help. Due to bankruptcy and the loss of the rest of my family, I have been busy other places. I can start to play now.
I have been on OU.com and it seems where ever TK goes, the story is the same. Told me the same thing but thats another story for another thread. Soon. The controller circuit will be of help to me so have reason to build it. Parts on order this week.

thaelin

Hi thaelin. So sorry to hear of your family's problems. I hope it's now sorted. And am delighted to hear that you'll be replicating. Just hold back on the switch until Aaron's got this right. I think he's virtually there but still a little tweaking. So pleased you'll do this.

[Aaron]

oscillation

@Aaron - interesting to read that it's the "original" Ainslie circuit that only seems to produce the aperiodic waveform. While my BU208 circuit seems to produce a far better signal than my lone PC50 mosfet did, try as I might, I cannot get it to do anything unusual

Hi Sprocket,

When I finally built the quantum circuit and tested it out, I had to laugh pretty hard. One of those things that goes full circle. I'm really glad I didn't built it first though because I learned so much.

It does do the aperiodic waveform without all the spikes in between. With Peter's circuit, I can get the aperiodic waveform with as many spikes as I want between pulses. Will just have to do the tests later to see if those spikes (each is a ringing waveform) actually add to or take away from results.

This quantum circuit does give much more aperiodicity to the pulses if set to do so. However, in full blown steady oscillation, it seems to be very periodic in frequency but the amplitude seems to vary quite a bit when seeing enough samples.

Not sure about any other mosefets than the one I'm using but it definitely needs to be at preferable frequencies and duty cycles for each setup...and of course combined with the right gate resistance. Everything happens within the first 100 to 200 ohm range at the gate. No more is needed.

With zero resistance at gate, it oscillates really easy. However, it isn't too efficient. With a little resistance it dampens the oscillation. THEN, just past that with a little more resistance, it is back in oscillation, this is where we want it. At that point - it only oscillates if frequency and duty cycle is just right.

So 0 resistance oscillation, little resistance no oscillation, little more oscillation (this is the area we want only when frequency and duty cycle is just right.