photoflash capacitor discharge time
kimbomba, Mon Dec 26 2016, 06:06AMI've tried to find without success the discharge time of a typical photoflash capacitor when you short it. Any ideas on how to calculate it, or an average figure? thanks in advance
Re: photoflash capacitor discharge time
Patrick, Mon Dec 26 2016, 06:37AM
well RC is the typical means, but the tube turns to almost zero resistance. so this circuit tends to be limited to parasitics and ESR. within the capacitor. So i think you might, if your willing to risk an oscillscope, use inductive or a nearby plate or wire to sort of be in tune with the pulse. i dont know if you want to do it by current, voltage or both. but dont kill your o-scope.
Patrick, Mon Dec 26 2016, 06:37AM
well RC is the typical means, but the tube turns to almost zero resistance. so this circuit tends to be limited to parasitics and ESR. within the capacitor. So i think you might, if your willing to risk an oscillscope, use inductive or a nearby plate or wire to sort of be in tune with the pulse. i dont know if you want to do it by current, voltage or both. but dont kill your o-scope.
Re: photoflash capacitor discharge time
Dr. Slack, Mon Dec 26 2016, 08:21AM
If you look at the Rubycon data for the 120uF photoflash capacitor, they quote a nominal lifetime of 5000 shots into a 1 ohm load.
You'll probably find the ESR within an order of magnitude of that figure.
Dr. Slack, Mon Dec 26 2016, 08:21AM
If you look at the Rubycon data for the 120uF photoflash capacitor, they quote a nominal lifetime of 5000 shots into a 1 ohm load.
You'll probably find the ESR within an order of magnitude of that figure.
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