Use for the Tesla Switch

[ldissing]

[...]

If you want a guess about how many spikes you need and how strong they need to be: well, the SG circuitry should be a good start....

Agreed! Whole heartedly agree!

Leroy

[StevanC]

How about the capacitor pulsed SG?

[StevanC]

The *rising* edge of the pulse
IMHO


why?

[lamare]

Agreed! Whole heartedly agree!

Great!

I have been thinking about how to do this. Maybe it would be best to keep as close to the SG circuitry as possible. I don't think it is necessary to have it self oscillate, but that's certainly an option. Another option would be to use a 555 to drive the transistor.

The most logical thing to think of is to put a transistor in series with the coil, and put both in between the bridge, which is where the coil is now.

However, then you can't use a diode to direct the spike to the charging batteries, because then the emitter of the transistor would be at the same potential as the diode and then you might as well leave the transistor out....

However, you could also put the emitter of the transistor at signal ground level, while you would have the diode go to the negative side of the bridge. Then you would have almost the same circuit as in the SG. Since that has been proven to work, I don't see why this should not....

The only drawback would be that you would have an additional bias current always going trough your coil, but that ends up charging the batteries, so it's not wasted. If that would turn out to be a problem, you could use two transistors. One to signal ground to drive the coil, and one to the negative side of the bridge to catch the spike. Of course, only one of the two would be "on" at any time....

[ldissing]

Cryptic

The *rising* edge of the pulse
IMHO


why?

Too cryptic for me, my friend.

Leroy

[StevanC]

Loads?

Too cryptic for me, my friend.

Leroy

When I routinely scoped while dumping capacitors to a lead acid battery i became aware of a funny thing:


I don't need ever discharge that capacitor to charge the battery


I merely have to show it "i have charge, see?" and switch off.

On a scope shot over the battery this looks rather like a very sharp spike (2,5usec one) not much higher than 1V maybe 2,5V on a healthy battery (this would result with a 60V+ on a lousy battery).

That's all, and the battery "knows where togo" upon receiving that.

really funny


What loads like the TS?

Best regards,
Stevan C.

[ldissing]

Hence

When I routinely scoped while dumping capacitors to a lead acid battery i became aware of a funny thing:


I don't need ever discharge that capacitor to charge the battery


I merely have to show it "i have charge, see?" and switch off.

On a scope shot over the battery this looks rather like a very sharp spike (2,5usec one) not much higher than 1V maybe 2,5V on a healthy battery (this would result with a 60V+ on a lousy battery).

That's all, and the battery "knows where togo" upon receiving that.

really funny


What loads like the TS?

Best regards,
Stevan C.

Hence, your small nf or pf capacitors and big resistors in your discharge circuit?

How much potential in the cap? I used the word potential instead of charge because I like it better, but either is fine with me.

How much potential was transferred? I've seen those same small bumps in good batteries and same big ones in the bad batteries. But I was discharging the cap in an inverted circuit.

What loads like the TS? That was the question, right? Kind of a strangely worded question, but you are an interesting guy.

Inductors loads like the TS, no? Bulb loads like the TS, no? Capacitive loads do not like as much, no? Loads that vary resistance based on current flow, ones that resist changes in current and low frequency, I think, no?

Lero

[Bit's-n-Bytes]

What are the readings at D1,D5, D9 and D10

Ok team, need a little help. When the "sweet spot" is producing the highest spikes on an inductive load, what are your readings at the test points in relation to Batt1 negative? I am trying to integrate an op amp into the circuit for sensing, thus being able to have the PIC "auto adjust" the pulse rate.

Thanks

Bit's

[StevanC]

Hence, your small nf or pf capacitors and big resistors in your discharge circuit?

No, I always use uF (several) and mF caps (330uF = small / 10mF= large)

How much potential in the cap? I used the word potential instead of charge because I like it better, but either is fine with me.

I used to go up to 65V on neon triggered but only with up to 560uF

I go up to 33V with the 8mF50V rated cap bank (fired off two MJ15024)

But i also dumped trough a IRFP260 but that's an other story...

How much potential was transferred? I've seen those same small bumps in good batteries and same big ones in the bad batteries. But I was discharging the cap in an inverted circuit.

Sometimes i adjust (it's always 555 based now) to minimum ending voltage (= current mode) or sometimes I don't allow the cap to deplete (I switch it off sooner) and allow only "shallow" spooling (="dry potential" mode)

What loads like the TS? That was the question, right? Kind of a strangely worded question, but you are an interesting guy.

Yes, what loads like the heavy amperage on the "shallow" voltage of 5...9V? JT type transformers running neon lights?
off I go try one...

A. Inductors loads like the TS, no?
B. Bulb loads like the TS, no?
C. Capacitive loads do not like as much, no?

Beats the hell out of me, but I think bulbs of lesser voltage like it more (is that #47?)

Loads that vary resistance based on current flow, ones that resist changes in current and low frequency, I think, no?

Lero

Hey, I can't guess what You refer to here?

Best regards,
Stevan C.

[Bit's-n-Bytes]

Oscope display of Tesla Switch

Ok team, need a little help. When the "sweet spot" is producing the highest spikes on an inductive load, what are your readings at the test points in relation to Batt1 negative? I am trying to integrate an op amp into the circuit for sensing, thus being able to have the PIC "auto adjust" the pulse rate.

Thanks

Bit's

More help needed. Take a look;

YouTube - PIC Controller Oscope.MPG

Thanks
Bit's

[Helijason]

MicroProcessor (MP) Question

Bit's, nice video glad to see you got your scope so soon!

Have you checked the frequency of both outputs to verify that the code is updating properly? Not questioning you, just not sure how the picaxe functions!

Jason

[Bit's-n-Bytes]

Bit's, nice video glad to see you got your scope so soon!

Have you checked the frequency of both outputs to verify that the code is updating properly? Not questioning you, just not sure how the picaxe functions!

Jason

Thanks Jason, I am trying all different frequency and pulse durations. The load is a coil of 22awg with about 6.6 ohms. I can tune to get all batt's "holding their own" if you will. Not going down, but not ascending either. I am close. (It could be the dry cells vs. the flooded batts as well).

Thanks

Bit's

[Helijason]

MP Frequency 2

Thanks Jason, I am trying all different frequency and pulse durations. The load is a coil of 22awg with about 6.6 ohms. I can tune to get all batt's "holding their own" if you will. Not going down, but not ascending either. I am close. (It could be the dry cells vs. the flooded batts as well).

Thanks

Bit's

yep, pretty close indeed! I was questioning that your output pulses trains are what you would expect them to be (on and off times are consistent).

Also, it would be interesting to give the battery 1 side an extra pulse from time to time. Could you overcome the mp drain? Wish I could be in the trenches with you!! I got my dev tools in yesterday, still looking for a good scope.

[ldissing]

Thanks Jason, I am trying all different frequency and pulse durations. The load is a coil of 22awg with about 6.6 ohms. I can tune to get all batt's "holding their own" if you will. Not going down, but not ascending either. I am close. (It could be the dry cells vs. the flooded batts as well).

Thanks

Bit's

Bit's : I'd try to get the ohms down on that coil. I'd try to get it down to an ohm or less. The inductor needs to be fairly close to the batteries internal impedance, I think. A really good battery, a big one, has impedance down into the milli ohms.

Leroy

[ldissing]

555

No, I always use uF (several) and mF caps (330uF = small / 10mF= large)
Stevan C.

I was referring to your 555 circuits when I said...small caps. I know you don't use those tiny ones for the voltage...but that should work too based on your comment....if they can see I have charge"...

I used to go up to 65V on neon triggered but only with up to 560uF

I go up to 33V with the 8mF50V rated cap bank (fired off two MJ15024)

But i also dumped trough a IRFP260 but that's an other story...
Stevan C.

Me too, but not the IRF....

Yes, what loads like the heavy amperage on the "shallow" voltage of 5...9V? JT type transformers running neon lights?
off I go try one...
Stevan C.

Good, I understand you.

Beats the hell out of me, but I think bulbs of lesser voltage like it more (is that #47?)
Stevan C.

Current of 150ma at 6.3 volts....that is the #47, I believe.

Hey, I can't guess what You refer to here?
Stevan C.

Well, I don't always know what I'm talking about either. Bulbs vary resistance based on current/potential. Coils don't like change, they resist change, so when current is flowing, they want it to continue...even if you shut the current off. They also do not like it when no current is flowing and you start putting a high current through it, i.e. they want to stop that current. Coils like the, or want to keep the status quo and put up spikes in response. They vary the resistance on change, so to speak, to keep things the same, although, in a coil, it is really putting out HV potential as a spike in response to the change. That is what I meant, if that makes sense.

Lero to you.