[FoxInSocks]

it’s the simplest piece of equipment ,, just some capacitors and a switch,, the only reason they cost more than $20 is because of lawsuits..

AEDs read and analyze electrical activity from the patient's heart to detect shockable rhythms. If a shockable rhythm is present, the AED can deliver measured and carefully timed jolts of electricity to restore a normal rhythm. The process requires more hardware and software than "just some capacitors and a switch."

[Neidermeyer]

OK ,, you win ,, it also requires a $5 discriminator circuit..