<< A lot of cheap televisions have bad power supplies that increase in voltage over time as the electrolytics dry out, and they dont have any form of regulation in the horizontal circuits to regulate the final grid (aquadag or g4 (acceleration voltage is usually 300-600 volts, being g2 or the screen adjustment unless they call they call the final grid the accelration grid in the states..?)) and the voltage goes well above 30kv resulting in very dangerous amounts of Xray radiation leaving the front of the screen. Buying a good brand television has health benefits as well, bet nobody here knew that >>
Don't most sets have a safety gap that will discharge in event of extreme over voltage?
<< One more thing, dry skin typically has a breakover voltage of about 50-70 volts depending on the person. Wet your finger and put a 9 volt square type battery on the wet part. Feel the pain as the current goes through your finger? If your slightly perspiring on your hands as many people do, it merely needs 35-40 volts to break through. Most car amplifiers have around 50-100 volts from the DC-DC converter used inside them. This has NOTHING to do with the 12v from the car battery, that is relatively harmless even if your skin is wet. Without even taking anything apart, turn your car stereo's volume up and put your thumb and forefinger across the speaker and you will feel quite a lot of electricity going through your hand, it will be painful. That is my point, even a benign item such as a car audio amplifier can kill, by what you posted shows you do not have a full understanding of how to develop power. You need voltage which delivers a current depending on the targets impedance. Power equals voltage squared divided by impedance so 12 volts equals 144 / 4 = 36 watts. That is a DC formula but it partially applies. In reality you will not get more than about 20 watts RMS from a 12 volt source by using a twin inverted phase amplifier due to transistor voltage drops. >>
I have plenty of background and experience on "developing power". My analogy comparing things to a car battery was misunderstood. The point was that you can have plenty of current but as long as there isn't enough voltage to allow it to flow, you're safe.
What can give a hazardous shock that most people here have is a UPS. Most use low voltage lead acid piles usually 6 or 12 volts. Yet they can put out 120 volts of something that resembles sinus power. The better ones actually do put out sinus power. Ones like I've serviced that have 196 volt battery arrays (4500 A/H) and large ferroresonant tranformers weighing a few tons!
Anyway, my threshold for feeling pain is very high. I've never been able to feel the tingle from a nine volt pile with the exception of putting the terminals on my tongue! My 11W RMS Delco head unit in my car would never develop enough open circuit volts to be felt on my hand. My Mark Levinson No. 33H power amp that I use at home can make a strong shock similar to an encounter with primary house current, however.
Probably the best example of using a very safe source (9V pile) into something that can be unpleasant is a handheld "stun gun" carried by some law enforcement personell. The 100,000V or so these units claim to put out sounds very intimidating, and the feeble current (60 microamperes) certainly WILL flow through one's body regardless of their condition! They certainly won't kill anyone, just cause muscle contractions. People like me just get pissed off. My wife bought one for "personal protection" and she was scared sh!tless when I shocked myself with it and said that would just make me more pissed off! Now if someone came after me with a nice 20kV 15mA power brick, I'd run if I didn't have a piece! 🙂
Cheers!
