Speaking of capacitor measurement... I am building a capacitive discharge spot welder/cutter similar to the ones at http://ultrakeet.com/index.php?id=article&name=cdWelder_p2 and http://frikkieg.blogspot.com I went down to the local electronics emporium and bought a 1.5 farad 0.002 ohms ESR car audio cap, took it home, and did some measuring. Turns out the capacitance was 0.15F and the esr was .026 ohms. A second sample had the same value (ESR was .0065 ohms). Utter ripoff! Also the capacitor can was about 1/3 empty. I also tested some heavy gauge car audio cables for the store owner. BEWARE, some of the audio cable suppliers are up to similar shenanigans. A 4 AWG cable that looked like copper was plated aluminum (1.5 times the resistance of copper). 8 and 10 AWG cables were some mystery metal... 3 times the resistance of copper (but not magnetic). All were made in China (as were the caps). One bright spot was a piece of Made in the USA pure oxygen free copper 10 AWG cable. It measured over 20% better conductance than one would expect from pure copper! Looks like it is a little fatter than 10 AWG. Two strands of that 10 AWG wire has less resistance than the 4 AWG aluminium stuff. _________________________________________________________________ The New Busy is not the old busy. Search, chat and e-mail from your inbox. http://www.windowslive.com/campaign/thenewbusy?ocid=PID27925::T:WLMTAGL:ON:WL:en-US:WM_HMP:032010_3

Absolutely no surprise at all. Audiophoolery is rife with scams from A to Z. It has been so for at least 40 years. The ONLY real thing is that crap costs FAR more than it's worth. YMMV, -John ============== > > Speaking of capacitor measurement... I am building a capacitive discharge > spot welder/cutter similar to the ones at > http://ultrakeet.com/index.php?id=article&name=cdWelder_p2 and > http://frikkieg.blogspot.com > > I went down to the local electronics emporium and bought a 1.5 farad 0.002 > ohms ESR car audio cap, took it home, and did some measuring. Turns > out the capacitance was 0.15F and the esr was .026 ohms. A second sample > had the same value (ESR was .0065 ohms). Utter ripoff! Also the > capacitor can was about 1/3 empty. > > I also tested some heavy gauge car audio cables for the store owner. > BEWARE, some of the audio cable suppliers are up to similar shenanigans. > A 4 AWG cable that looked like copper was plated aluminum (1.5 times the > resistance of copper). 8 and 10 AWG cables were some mystery metal... 3 > times the resistance of copper (but not magnetic). All were made in China > (as were the caps). > > One bright spot was a piece of Made in the USA pure oxygen free copper 10 > AWG cable. It measured over 20% better conductance than one would expect > from pure copper! Looks like it is a little fatter than 10 AWG. Two > strands of that 10 AWG wire has less resistance than the 4 AWG aluminium > stuff. > _________________________________________________________________ > The New Busy is not the old busy. Search, chat and e-mail from your inbox. > http://www.windowslive.com/campaign/thenewbusy?ocid=PID27925::T:WLMTAGL:ON:WL:en-US:WM_HMP:032010_3 > _______________________________________________ > volt-nuts mailing list -- volt-nuts@febo.com > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts > and follow the instructions there. > >