Posted by rod on June 27, 2005, at 15:06:51
In reply to 0.9 Amps » rod, posted by ed_uk on June 27, 2005, at 13:28:29
Hi Ed!
> The Thymatron ECT machine.........
>
> STIMULUS OUTPUT
>
> Current: 0.9 amp constant, limited to 450 volts, isolated from line current.
>
> Frequency: 10 to 70 Hz in 10 Hz increments (to 140 Hz with “LOW 0.25” program)
>
> Pulsewidth: 0.25 to 1.5 ms in 0.25 ms increments
>
> Duration: 0.14 to 7.99 sec in increments of equal charge.
>
> Maximum output: Standard maximum output across 220 ohms impedance, 504 mC, 99.4 joules. Output with double-dose option (where available) across 220 ohms impedance: 1008 mC, 198.8 joules.
>
> Since you're an expert in electronics, can you explain this????hehe LOL me an expert :-) hmmm but thanks for the kind words.
Ok, thats how I understand the text.
0,9 amps constant mean its a square wave. not a sine wave. sine wave wouldn't be constant.
frequency is clear? right?
As it produces a square wave, the current gets turned off and on, 10 to 70 times per second.Pulse Width, it the time, the current is turned on, before it gets turned off again. (most of the time its off, but it gets turned on 10 to 70 times per second for 0.25 to 1.5 ms)
The whole on off cycle comes in trains (trains of pulses) with a duration of 0.14 to 7.99 sec
The time between the trains isn't stated here. I guess it lies in the hands of the E-doc.
everything clear so far?
1 Coulomb = the quantity of electrons when a current of one ampere flows for one second. which is 6.241506 x 10^18 electrons. mC means 6.241506 x 10^15 electrons.
Coulomb is simply the unit for the quantity of electrons, the Charge. its unit is As (ampere seconds)
Joule means how much work it can do.
Let me activate my hypoperfused brain cell remainings and show you where this 99,4 joule come fromCharge Q = I * t => t=0,504/0.9=0.56 s (time t)
Power P=V*I, Work W=P*t => W=V*I*t (since V=R*I) W=I^2*R*t with above time and I=0.9 A and R=220 Ohm => W=0.9*0.9*220*0,56 = 99,792 joule voila :-P I guess the 0.392 joule difference get "used up" inside the machine (inner impedance. my "model" doesnt consider that)> Hi Roli! (Do you prefer me to call you Roli or Roland?)
Hmmmmm dont really care about that. Most friends call me Roli, but Roland sounds a bit more mature :-)
well then call me Roland> I was just talking to my dad about ECT. He's a electronics lecturer. He thinks 0.9A is very high current to pass through the body. Wouldn't it heat the brain up? Perhaps not, if it uses brief pulses?
exactly. I also think brief pulses are the key in not cooking your brain.
I once made a mistake with my Cranial Electro Stimulation Device and turned on a steady current of about 0.1 mA (0.0001 Amps) and within 2 seconds, ouch, the electrodes (the skin where they were attached) got really hot!
mfg :-P
Roland
poster:rod
thread:519427
URL: http://www.dr-bob.org/babble/20050627/msgs/519955.html