How to find max-current?

Started by Dave, I can't do that in sci.electronics.design16 minutes ago 3 replies

Hi, I have two big old DC motors I got from a swap meet. The only sticker on them says "Nominal 30vdc." They only have two terminals so no wire...

Hi, I have two big old DC motors I got from a swap meet. The only sticker on them says "Nominal 30vdc." They only have two terminals so no wire size to go by. They work fine, no load, using a 30vdc 15A Buck/Boost speed controller. They are about 4" diameter and 8" long. No idea what they came from but size matters. It has a 5/8" diameter shaft with 3/16" key-way, so guessing it is made for some...


OT: Loud bang in Manchester Concert Arena was caused by....

Started by Cursitor Doom in sci.electronics.design23 minutes ago 39 replies

"The performer dropping her mic, causing a speaker stack to blow out." -BBC Does anyone pay any attention to a single word they say any more?

"The performer dropping her mic, causing a speaker stack to blow out." -BBC Does anyone pay any attention to a single word they say any more?


Power Line Noise Infecting Instruments?

Started by Cursitor Doom in sci.electronics.design42 minutes ago 43 replies

Gentlemen, I just fired up a spectrum analyser for the first time in many years and am horrified at the noise I'm picking up from the mains....

Gentlemen, I just fired up a spectrum analyser for the first time in many years and am horrified at the noise I'm picking up from the mains. Even with every wall wart in the house turned off it's still there and there's nothing I can do about it short of going around the neighbours and turning all their stuff off (which I imagine would not go down well). Is anyone else finding such dev...


Whe is the US Leaking Info on the Manchester Bombing?

Started by rickman in sci.electronics.design1 hour ago 9 replies

I'm reading reports of US government officials releasing information on the Manchester bombing that the UK wants to keep under wraps while they...

I'm reading reports of US government officials releasing information on the Manchester bombing that the UK wants to keep under wraps while they investigate. Even after the UK complains about the leaks we continue to leak info. Why is the US government leaking any of this??? Why are reporters even asking US officials rather than the UK? Has Trump so ruined the US reputation for keep...


What's wrong with "national health care"?

Started by Don Y in sci.electronics.design1 hour ago 223 replies

So, for the folks who live/work in places with "national health care" (whatever THAT means), what's *wrong* with it? I.e., what would you wish...

So, for the folks who live/work in places with "national health care" (whatever THAT means), what's *wrong* with it? I.e., what would you wish was different/better? How are your "death panels" implemented? How is care "rationed"? What have you NOT been given (by way of care) that you feel you ought to have? I.e., if you were starting from scratch to reinvent YOUR system, what would you ...


OT. My household was randomly selected.

Started by amdx in sci.electronics.design2 hours ago 48 replies

My household was randomly selected for the Census Bureaus "American Community Survey". I'm sure I will skew my community results. I'm...

My household was randomly selected for the Census Bureaus "American Community Survey". I'm sure I will skew my community results. I'm not on welfare, I earn money, I earn interest, I'm not on disability, I own my home, I don't have a mortgage, I'm not divorced, I married only once, I don't get any type of government check, I don't have anyone else pay my heat bill, I pay for my own...


Can we PLEASE stop using these shitty symbols?

Started by Tim Williams in sci.electronics.design2 hours ago 18 replies

Proof in case: http://www.ecnmag.com/sites/ecnmag.com/files/legacyimages/ECN/Articles/CS-1109-Figure_02.jpg It's bad enough that AoE3...

Proof in case: http://www.ecnmag.com/sites/ecnmag.com/files/legacyimages/ECN/Articles/CS-1109-Figure_02.jpg It's bad enough that AoE3 stooped to using those MOSFET symbols. (The only problem I can find with the tome! Why did it have to be such an important, and deceptive, problem!? Please Win, if you fix this in a reprint, I will send you the finest bottle of liquor I can find.) ...


supercap leakage

Started by John Larkin in sci.electronics.design4 hours ago

https://dl.dropboxusercontent.com/u/53724080/Parts/Caps/Supercap_Leakage.JPG Looks like it would be fine to stack these in series without...

https://dl.dropboxusercontent.com/u/53724080/Parts/Caps/Supercap_Leakage.JPG Looks like it would be fine to stack these in series without any equalizing parts, like regular wet aluminum caps. Measuring supercaps is an enormous pain; every step takes hours. The equivalent dielectric absorption is huge. Leakage tempco appears to be strongly negative, but that may be an illusion. -...


The American Anti-Corruption Act

Started by Anonymous in sci.electronics.design4 hours ago 17 replies

Long overdue: https://www.youtube.com/watch?v=lhe286ky-9A https://anticorruptionact.org/ https://represent.us/

Long overdue: https://www.youtube.com/watch?v=lhe286ky-9A https://anticorruptionact.org/ https://represent.us/


Acceptable thru-hole solder joints, IPC

Started by Joerg in sci.electronics.design4 hours ago 4 replies

Folks, Just had a discussion with a contract manufacturer. They were of the opinion that a solder joint where there is complete...

Folks, Just had a discussion with a contract manufacturer. They were of the opinion that a solder joint where there is complete circumferential inward capillary on the component side but regular wicking on the solder side is acceptable. This is consumer stuff and I am more used to the hi-rel industry where this is not deemed acceptable because nobody would know how deep the inward cap...


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