What's inside an AED? (PWJ46)

A look into a Powerheart AED from about 2002 and playing with some parts of it...

[@CEzikMaj]

Anyone could even know what is a AED, but if anyone watch this video, they could know how AED is bulit. Very interesting material!

[@mikeselectricstuff]

For deep holes, another fix is to cut a slot in the back of the driver bit with a hacksaw or dermel, and use a flat-blade screwdriver

[@MrDubje]

Isn't this almost, if not, the exact defibrillator you once tore down?

[@johnalexander2349]

Or get the Wera KK62 set.

[@douro20]

No, this is newer.

[@PlaywithJunk]

That's a good idea. Maybe combined with a magnet...?

[@tkojabroni2833]

4 piezo beepers ganged up in parallel. what a madman!

[@92kosta]

Next video: "What's inside an IED?"

[@cncdavenz]

Interesting video, keep them up. Cheers Dave.

[@RWGresearch]

nice!! I have one awaiting for me to take apart. ;) Will be interesting to see the difference. ~Russ

[@spambot7110]

that's gotta be the hugest SMT ceramic cap I've ever seen! (just to the right of the shielded box on the HV board

[@TCPUDPATM]

Great place to farm for some high end capacitors and other components!

[@douro20]

The storage capacitors are most likely from Cornell Dubilier.

[@videosuperhighway7655]

Wow cmos 80186 cpu thats like the 80286 minus the protected memory functions but has multiple I/O components and support components on die that would have required a bunch of chips. Also that chip are highly debugged and designed for critical functions. Not sure if Intel still makes them, huge in military applications. The MUL instruction is significant faster than the 8086 since its no longer microcode based.

[@Tangobaldy]

resonance is the word

[@Tacos1543]

What model is that aed

[@billwilliams6338]

What is the difference between measuring the ground leakage compared to the chassis leakage, they are both very different measurements. The safety analyzers manual says when you reverse the polarity of the AC cord outlet you have to "pause" before reversing the polarity of the AC outlet, any reasons why you have to "pause" its AC and the power supply will convert it to dc. But the manual says that motors or loads will reverse the voltage and current and damage the equipment. Reversing the polarity of the AC outlet shouldn't do anything since the internal power supply to the device under test will not care i would think.

[@billwilliams6338]

What are the most common parts to fail and replace in defibllators?

[@PlaywithJunk]

Well... I don't repair these things. But from what I find in the dumpster, I would say the batteries. Most medical devices must be replaced before they fail. They have an expiration date....

[@billwilliams6338]

Thanks, Does biomedical power supply have lower leakage current compared to customer general power supplies? any differences in the power supplies. What components are causing leakage current in switching power supplies? Biomedical equipment has multiple isolation grounds, does using more isolated ground lower the leakage current? How do you test the leakage current if you can't disconnect the biomedical equipment that is plugged into the AC outlet, you have to use a "point to point" safety analyzer to measure leakage current this way but i don't know how to put my probes, One probe on the outside chassis of the biomedical equipment and the other end goes where to measure leakage current? Safety analyzer manuals say that leakage current is an AC current and DC current is this true its both AC and DC? The AC ground cord resistance can be high and still the leakage current is measure the same in microamps, so the AC cord ground resistance doesn't affect the leakage current in my opinion, any reasons why?

[@PlaywithJunk]

I have never compared the data of medical and non-medical P.S. If you are interested in that matter, you should consult the website of Delta Power or Astec. The make everything and they have datasheets online.

[@mohamedsaifulla8483]

Hi …how does a Defibrillator or AED operated in Battery mode with battery. Voltage 7.2volt or 9 volt or 12 volt battery able to produce very high voltage pulse of 3000 Volt … what is the circuit or component helping to achieve this.. can you explain

[@PlaywithJunk]

In the same way as all voltages can be stepped up to any desired high voltage. You need to make AC voltage from DC and then use a transformer or coil to get a higher voltage. Just google "step up converter schematic" and you'll find many examples.

[@billwilliams6338]

Do you know why biomedical equipment has leakage current in the microamps, where is these leakage current coming from or components that cause leakage current?

[@PlaywithJunk]

Every mains powered device (with switched power supply) has leakage currents. Medical devices are designed to have extremely low leakage. That's why many medical devices are battery powered to prevent leakage completely. The reason is in the power supply and the RF filtering and EMI compliance. Most power supplies have small capacitors across the transformer (from primary to secondary) to reduce electrical noise but these also produce some leakage. So it's a balance between simple design, EMI/RF compliance and safety. And all the medical devices which are mains powered have a large diameter grounding connector. Any leakage current will be grounded so that it doesn't flow through the patient. Additionally all the electrodes that get in contact with the patient are separated from the main circuit by optocouplers or other insulating devices.

[@mikeselectricstuff]

Very similar to the one I took apart a few years ago : kzbin.info/www/bejne/pp-QiKlvjqaZrJI

[@DanielRowe]

The port that looks like a phone port could be to pull data off it if there is a need to see what happened for an investigation.

[@station240]

The serial port is so the Hospital can download the entire ECG record from when the machine is used. Helps them figure out what sort of heart problem the patient has.

[@PlaywithJunk]

that makes sense. but I think some maintenance or hardware diagnostic could also be possible

[@KevinLyons-gn7eu]

How do you do you know are you a nurse? Are you a doctor?

[@KevinLyons-gn7eu]

@@PlaywithJunk where are you from?

[@PlaywithJunk]

@@KevinLyons-gn7eu Switzerland 😊

[@KevinLyons-gn7eu]

@@PlaywithJunk what in Switzerland? Are you from

[@brianhanson9367]

Take a 1/4" hex wrench and cut some off. Instant extension for that stuff.

[@Conenion]

I could image these big diodes are for charge pumping. en.wikipedia.org/wiki/Voltage_multiplier (German: de.wikipedia.org/wiki/Ladungspumpe#Positive_Ausgangsspannungen de.wikipedia.org/wiki/Spannungsverdoppler)

[@PlaywithJunk]

I had something like this in mind... could be possible

[@retrogamer33]

I use a flat head screwdriver on PS3 security torque screws

[@PlaywithJunk]

Yeah sometimes simple tools work perfectly

[@MrVinamp]

How to fix a broken heart....

[@PlaywithJunk]

pun intended... :-)

[@s8wc3]

Alcohol

[@tolgaturhan4691]

you know that an aed is a lifesaving device and that you do not have to disassemble those devices!!!!!!!!!!!!! and those devices are very very expensive.

[@PlaywithJunk]

calm down...This unit was defective and scrapped.

[@videosuperhighway7655]

Tolga Turhan actually not too expensive. 700 dollars gets you a nice recertified Phillips heartstart. I bought one for the office.

[@OverKillPlusOne]

My aunt works for them...I know that the units age out for a variety of reasons but not much more than that.

[@sciense3078]

lol restart a broke heart

[@douro20]

The storage capacitors are most likely from Cornell Dubilier.

[@douro20]

Too new to be Mallory.