Solder flux and resistance

Started by George Herold in sci.electronics.basics12 years ago 6 replies

When testing a high impedance board (up to 1 G ohm) I found that the SMD 0805 10 Meg ohm resistors measured only 6 meg ohm. The problem was...

When testing a high impedance board (up to 1 G ohm) I found that the SMD 0805 10 Meg ohm resistors measured only 6 meg ohm. The problem was traced back to the liquid flux used with Rohs solder. (100 Meg and 1 G resistors are through hole and measured correctly.) I then wanted to measure the resistance of different =91flux blobs=92. I made big solder blobs on 0805 SMD pads (spacing bet...


Unsolderable wire?

Started by Bob E. in sci.electronics.basics7 years ago 67 replies

I am trying to solder some RG-6 shield to a pcb. The braid won't tin. It's almost like it's dissipating the heat faster than I can apply it....

I am trying to solder some RG-6 shield to a pcb. The braid won't tin. It's almost like it's dissipating the heat faster than I can apply it. With both a temp-controlled iron (set as high as 700F) and a mondo 100W stick I finally tried. The solder will barely melt when touched to the braid opposite the iron. I've applied some Kester rosin paste flux as well using my trusty Kester 60/4...


Splattering solder into eye?

Started by Peter Hucker in sci.electronics.basics2 years ago 51 replies

Has anyone ever actually been unlucky enough to get solder splattering into their eye? I've had it hit my leg, hand, and face, but never in my...

Has anyone ever actually been unlucky enough to get solder splattering into their eye? I've had it hit my leg, hand, and face, but never in my eye. How bad is it? -- http://www.petersparrots.com http://www.insanevideoclips.com http://www.petersphotos.com Confuscious say: "War doesn't determine who's right. War determines who's left."


Solder these 2 wires while being able to slip the shrink tubing over the soldered connection

Started by AK in sci.electronics.basics2 years ago 7 replies

I would like to learn how to solder these 2 wires while being able to slip the shrink tubing over the soldered...

I would like to learn how to solder these 2 wires while being able to slip the shrink tubing over the soldered connection. Thanks. https://imgur.com/a/9z3z294


How to solder very thin stranded wire?

Started by DaveC in sci.electronics.basics10 years ago 33 replies

This is one conductor in a cable from some iPod earphones: http://www.tinyuploads.com/images/mizPu4.jpg What is the best way to deal with...

This is one conductor in a cable from some iPod earphones: http://www.tinyuploads.com/images/mizPu4.jpg What is the best way to deal with the fibre strands and to tin the wire? Thanks, Dave


Through Board Desoldering High Melting Point Solder

Started by Bret Cahill in sci.electronics.basics2 years ago 6 replies

The power wires for a 500 watt ebike motor go through the board. It there any off the shelf insulator designed to protect the caps and other...

The power wires for a 500 watt ebike motor go through the board. It there any off the shelf insulator designed to protect the caps and other components only 13 mm away? This is asking for a torch. Bret Cahill