non-destructively finding a break in an insulated DC wire

Started by Adam Funk in sci.electronics.basics8 years ago 15 replies

I have a wall-wart charger that put out 4.2 V DC on a figure-8 cable just over 1 metre long. There seems to be a weak spot or...

I have a wall-wart charger that put out 4.2 V DC on a figure-8 cable just over 1 metre long. There seems to be a weak spot or intermittent break in one of the wires --- sometimes it doesn't work but jiggling the cable makes it work. Is there any non-destructive way to find the position of the break? (I know I could cut it in half, test both halves, repeat as necessary, ... solder all the...


Charging lithium ion battery?

Started by Terry Pinnell in sci.electronics.basics6 years ago 3 replies

My ageing smartphone (an HTC Touch Pro 2, running Windows Mobile 6) has suddenly developed the show-stopping fault of refusing to charge any of...

My ageing smartphone (an HTC Touch Pro 2, running Windows Mobile 6) has suddenly developed the show-stopping fault of refusing to charge any of my five batteries. The smartphone itself is almost certainly faulty (I suspect an internal solder joint issue) but before I abandon it I want to try charging the batteries externally. With my DMM I've identified the two (outer) contacts of the four ...


usb headphone speaker has 4 pads and ? 3 wires ?

Started by robb in sci.electronics.basics7 years ago

trying to replace left headphone speaker in a set of USB headphones with mic Headphone very like...

trying to replace left headphone speaker in a set of USB headphones with mic Headphone very like this http://www.frys.com/product/4452636 Speaker like this http://www.digikey.com/product-detail/en/AS02808MR-2-R/668-1397-ND/4147321 The circuit board part with solder pads separated from the speaker from a fall to floor and the wires are so fine from speaker part i can not tell where t...