C
Craig
I have a 67uf 220V washing machine capacitor that I would like to see if
it works. How can I test it without a capacitance meter?
Thanks.
it works. How can I test it without a capacitance meter?
Thanks.
I have a 67uf 220V washing machine capacitor that I would like to see if
it works. How can I test it without a capacitance meter?
** A good cap will charge - hold that charge, then let it loose with a
bang.
Try charging the cap with a 600 volt 1 amp diode and 100 ohm 5 watt
resistor in series off the AC - be careful and have a safety switch on the
circuit !!!!
Leave it for a few minutes then short the terminals with a clip lead -
should give a nice loud bang and spark.
David said:Good caps will NOT let loose any charge with a bang.
Extremely dangerous thing to recommend Phil.
If the cap is shorted the diode and resistor will smoke.
The cap will potentially have 340V DC
(1.4 x 240VAC) on it, which is pretty lethal.
A safety switch (I assume
you mean an RCD device) will not protect you against potential
electrocution if you touch both terminals of the cap.
This could destory the capacitor, and cause molten metal to fly from the
arc you create.
DC is only limited by its internal resistance and that of the clip lead,
and could be 100 amps or more.
connection of the cap if it was not designed for high current discharges.
If you really want to try this, PLEASE WEAR SAFETY GLASSES to prevent bits
of molten metal and exploding capacitor getting in your eyes.
** Bullshit - it's done all the time with complete safety.
** The 5w resistor will just internally fuse with 300 watts dissipation.
** I can see you have never worked on any valve equipment or off line
SMPS.
** Nor if a meteorite hits you.
This could also melt the internal
** So you have never seen a camera flash gun or high powered strobe
????????????????
Camera flashes use electro caps of several hundred uF and discharge
them in 1 mS.
Strobes use caps like the one the OP's and charge and discharge them 10
times per second.
Phil said:Recommending someone with possibly limited experience connect things
directly to the mains is very dangerous and irresposible thing to do.
Depends on the resistor.
I can see you have never had a capacitor blow up in your face.
Over 30 people a year on average are fatally electrocuted in Australia.
Can you tell me how this provides information that the capacitor is the
correct value.
** Of course I have seen a camera flash gun and strobe lights. I also
know that photo flash capacitors are specially designed to cope with
very rapid high discharge current.
They are normally self healing type.
A bit different to a motor starting capacitor.
Phil Allison said:
Bill Bailley said:How are you with crocodiles and babies Phil ???
Recommending someone with possibly limited experience connect things
directly to the mains is very dangerous and irresposible thing to do.
Depends on the resistor. If the resistor is not a specially
designed fuseable resistor, it may not fuse without a lot of arcing etc.
There is a big difference between a fuse and a resistor.
i have,twice, hurts a lot when the top hits your face, but believe me,** I can see you have never had a capacitor blow up in your face.
"David" <[email protected]
** More bullshit from a stinking liar. I gave a clear warning of the
need to use a safety switch and use care.
Where were you when folk here were giving instructions to a novice on how
to fix his microwave oven ????
I got roundly abused for saying that was irresponsible.
** 5 w resistors are wire wound - they fuse when severely overloaded.
** I can see you are a fucking bullshit artist.
** How many of them were killed by poly caps ????
** The cap value is most unlikely to have changed.
Other failures are far more likely - they would be revealed by my
suggested test.
** You do not know any such thing.
** Electros are not self healing.
** We do not know exactly what the cap is - I assumed a polypropylene
as that is what you commonly see in washing machines. Such caps are self
healing and are used in high power (stage) strobes which I have serviced.
Typical failures modes are going open or developing a high internal
resistance.
David said:Recommending someone with possibly limited experience connect things
directly to the mains is very dangerous and irresposible thing to do.
Depends on the resistor. If the resistor is not a specially
designed fuseable resistor, it may not fuse without a lot of arcing etc.
There is a big difference between a fuse and a resistor.
** I can see you have never had a capacitor blow up in your face.
Over 30 people a year on average are fatally electrocuted in Australia.
If your electrocuted it is FATAL...
And Phil is again right..
Nope.
so get off his back,.
Rod Speed said:Not necessarily. Plenty survive.
Bob Parker said:Happy New Year Rod,
This is totally pedantic, but according to the two definitions of
"electrocute" Google found for me, it means "Kill by electric shock".
So by that definition, surviving electrocution would be like
surviving being murdered!
Happy New Year Rod,
This is totally pedantic, but according to the two definitions of
"electrocute" Google found for me, it means "Kill by electric shock".
So by that definition, surviving electrocution
would be like surviving being murdered!
That was just a troll so I could admit that my original was wrong.
Rod Speed said:Thanks, same to you and that cat from hell too |-)
The cat's really OK. I've got a new photo at
http://members.ozemail.com.au/~bobpar/PA151581.jpg
in which it looks quite human.
It's that scungy yapping fluffy little mongrel dog
next door which is from hell. Take a look at
http://bob.parker.web1000.com/yappy.htm
if you haven't already.![]()