Electrical Engineering

2:55 PM

Is 6000 W per day reasonable for an Arduino and some sensors?

rdtsc

eBay search sucks.... just sayin'.

@adamaero units don't make sense

in general, 6kW is a a ton of power, 1W max is more typical for sensor setups (and you can probably go much lower)

Ya, I realize in retrospect a J/second per day doesn't make sense

@TonyStewartSunnyskyguyEE75 Well, not a magnetic guru per se, but I do see a lot of shoot-through current through the "off" device. You may be better served by a NFET H-bridge with suitable drivers.

or a single half-bridge pair if you keep the differential supplies

Yes of course . That was just trying to emulate the standard SINUS PULSE at 1kW or more

using a split half -bridge

3:04 PM

ahh, cool. It wasn't clear where the thermal issue was.

If you wave over the FET the kW levels were too high

even with low RdsOn

at 100A

I need > 1 Tesla into 10uH?

how much current and turns air core. hmmm

That level will cause axons to reach Activation threshold and contract muscles which I need to heal crushed nerve bundle in my arm

after surgery

ouch, that's terrible!

The HW exist already and was developed in EU in Slovenia... Look it up... TESLA STYM

so I have 3 dead fingers

after 2mos post op with a plastic sealing rise time of 3 mos breaking off nerve communication

So I discovered this tesla

but yet not here ...in Canada or USA?

33 Hz seems to be sweet spot for excitation

Is it something where you're shooting for an exact field, or a precise field - time relationship?

yes to duplicate Central Nervous pulss

but magnetically stimulated withoput electrol-stimulous pain

pain free BH pulse not E Field

the ESP looks like a cattle prod to do the same but patient resistance is high to electrcution

this is a game changer for nerve therapy

if not too badly severed or crushed

3:13 PM

Every time I hear someone link their research with Tesla, I worry - Tesla was a genius, but a lot of his ideas didn't pan out, and a lot of people try to ride on his coat-tails.

SO after my arm bypass and thrombectemies ( roto Rooter) My Plumbing is perfect 93% Blood pressure to finger tips but median nerve bundle to 1st3 fingers is 99% dead

Dozens of therapy sites use in EU, and like MRI its magnetic

so its ironic I have an electrical problem in my arm that took months to grow or years then triggered with no pulse 9 weeks ago

now great pulse but dead fingers,, numb sore , weak

but I have a plan.. and I will restore it

So the thermal issue is with the MOSFETs, right?

but 3mos is the healing window ... afterthat 2 yrs maybe but very slow with alot ofg physio

yes

I think I need to go much lower pulse width alternating pulses rather than 50% PWM

but retain SINUS current shape

So looking at the waveforms, you're always running them in saturation, beyond 100's of amps.

yes

but notquite

need to fix shoot thru bias

3:18 PM

and that's a big issue as well, once the pulse diminishes

100+A because the source node is floating around.

do you need it in a Helmholtz coil arrangement to maintain a uniform field?

thats the unit .. just a small fan on paddle

small spiral large coil

cup size

non uniform focal centre

maybe air gapped??

2.5 T

I wonder if it's a "spec sheet half-truths" thing, where you might only be able to get 2.5T at the minimum repetition rate (1Hz)

Does it need to be bipolar current pulses?

I'm not sure you can get that kind of field with 10uH... (and practical currents)

3:45 PM

Wikipedia has good formulas for solenoid magnetic fields ( en.wikipedia.org/wiki/Solenoid ). I think if you wanted to concentrate the magnetic field, you may be able to make a gapped core that you can fit the affected area in, but getting those kinds of rise/fall times will be hard

you may need to have a full H-bridge circuit driving just the inductor (that shorts out the capacitor, or floats it).

The L(di/dt) parameters will be difficult, because you probably have an upper limit of 1mH to get similar rise times, and the voltage could easily be another knob to get you another order of magnitude.

I've got some ideas to get you on the right track with the electronics if you're interested, but I don't have the time to go through the magnetics equations and optimize those for your needs.

@TonyStewartSunnyskyguyEE75 Best wishes, feel free to drop by with updates

4:32 PM

TY @W5VO. The LV resonance is ~ 300 Hz Q= 0.5

To 400 Hz

A 14 Ah battery at 0.01A will reach 0 V or 10.5 V after 1400 hours?

Never mind.