Recent content by dgcider

The Raptor claims it is a "really 1F, not like the cheap ones" (I measured .25F) I got it from this ebay listing...

On the Volfenhag, I removed the circuit board (it wouldn't output any voltage when the power supply was disconnected) very carefully, since the cap have already been charged. The Raptor caps did not have any circuit boards (at least that I could see). The two capacitors are exactly the same size...

valid point - I can check that. for a "ideal" capacitor, it should not matter what voltage you start at, 2V or 20V, the RC discharge curve should still follow v(t)=v(0)*exp(-t/RC), and when you do the plots, they should have the same slope. But in the interest of fairness, I should use the...

I have made detailed measurements on a Raptor 1F cap and the Volfenhag 2.0 F cap. The setup was a 100 ohm 1% resistor across the cap, with a digital voltmeter monitoring the voltage. I charged the cap up through a 5 ohm power resistor to the voltage indicated at time 0, disconnected the power...

Follow up to dbird's comment on measured capacitance of automotive capacitors. I have two Raptor 1F 20/24V automotive capacitors and are trying to use them in a CD battery welder setup. I measured the capacitance of each at .25F !! I did this by connecting the 2 in parallel, then putting a...