Re: Re: MKP caps: are these for real?
I'm even dafter. I used to plug selenium rectifiers into the power outlets at school as an incredibly effective stink bomb.
Good idea! I think. At least as a comparison.
I held them up to my ears, but the dog was snoring too loud to hear anything else.
Do the polyester ones sound like disco?
Seriously, when you're buying them you deserve to know the truth and get what you pay for -- even if you're deaf. Also, a listening test implies building two versions of a project, or swapping parts to compare. That's a lot of additional time & effort. I'd rather just use the ones with better specs, especially when temperature stability is one of those specs. The price difference isn't that much and I'm not manufacturing, so it's easy for me to justify. Your mileage may vary.
..Todd
Conrad Hoffman said:
I'm even dafter. I used to plug selenium rectifiers into the power outlets at school as an incredibly effective stink bomb.
QSerraTico_Tico said:
Good idea! I think. At least as a comparison.
analog_sa said:
I held them up to my ears, but the dog was snoring too loud to hear anything else.
Do the polyester ones sound like disco?Seriously, when you're buying them you deserve to know the truth and get what you pay for -- even if you're deaf. Also, a listening test implies building two versions of a project, or swapping parts to compare. That's a lot of additional time & effort. I'd rather just use the ones with better specs, especially when temperature stability is one of those specs. The price difference isn't that much and I'm not manufacturing, so it's easy for me to justify. Your mileage may vary.
..Todd
http://www.janson-soft.de/lcmeter/lcmeter.htm
Use google to translate the german, if needed.
This meter is very accurate and can also measure inductances.
I plan to provide a small kit on a my version of this circuit shortly.
Still fighting the battle of trying to use TI's microprosesors... These would make the battery last very long.
It is more accurate on small values than most bridges....
Burn a polyseter shirt to find out what it smells like......
Use google to translate the german, if needed.
This meter is very accurate and can also measure inductances.
I plan to provide a small kit on a my version of this circuit shortly.
Still fighting the battle of trying to use TI's microprosesors... These would make the battery last very long.
It is more accurate on small values than most bridges....
Burn a polyseter shirt to find out what it smells like......
Where is Elso Kwak if you need him?
http://www.diyaudio.com/forums/showthread.php?postid=153877#post153877
http://www.diyaudio.com/forums/showthread.php?postid=153877#post153877
Yeah, I'd be suspicious of claims for unknown brands of any capacitor; best to test.
A quick and dirty method I use to check dielectrics is to charge up the capacitor to a reasonable voltage and let it sit a while, then short the leads (not recommended with large capacitors and very high voltages!) and let the capacitor sit a minute or three (with the leads unshorted!).
Measure the residual voltage. Polypropylene, polystyrene and teflon types will generally measure around a tenth of a volt. Most others will measure at least a few tenths to a volt or more.
Measuring the ESR of film/foil versus metallized film requires more test equipment.
A quick and dirty method I use to check dielectrics is to charge up the capacitor to a reasonable voltage and let it sit a while, then short the leads (not recommended with large capacitors and very high voltages!) and let the capacitor sit a minute or three (with the leads unshorted!).
Measure the residual voltage. Polypropylene, polystyrene and teflon types will generally measure around a tenth of a volt. Most others will measure at least a few tenths to a volt or more.
Measuring the ESR of film/foil versus metallized film requires more test equipment.
- Status
- This old topic is closed. If you want to reopen this topic, contact a moderator using the "Report Post" button.