Re: Circuit board trace repair...
Chuck Guzis via cctalk wrote: On 8/13/20 9:58 PM, dwight via cctalk wrote: How much current is ir suppose to carry? I'd just replace it with a piece of wire wrap wire if it is less than an amp. Of course, I assume you've fixed what ever failed to cause it to blow. Gold wire is expensive. Dwight According to my tables, AWG 30 copper wire has a resistance of 0.107 ohm per foot or about 9 milliohm per inch. I suspect that it would work under almost all PCB repair conditions. I've repaired power traces on CPU boards using WW wire with no ill effects. --Chuck Of course, it is not just about the resistance, but the resulting thermal cycling at the endpoints... About 25 years ago, I learned the hard way about keeping each amp across at least two DB-whatever pins in experimental hybrid-electric vehicles. Nowadays we routinely x-ray crimps for safety-critical things such as ABS harnesses. Ampacity calculations differ wildly accross applications. carlos.
Re: Circuit board trace repair...
On 8/13/20 9:58 PM, dwight via cctalk wrote: > How much current is ir suppose to carry? I'd just replace it with a piece of > wire wrap wire if it is less than an amp. > Of course, I assume you've fixed what ever failed to cause it to blow. > Gold wire is expensive. > Dwight According to my tables, AWG 30 copper wire has a resistance of 0.107 ohm per foot or about 9 milliohm per inch. I suspect that it would work under almost all PCB repair conditions. I've repaired power traces on CPU boards using WW wire with no ill effects. --Chuck
Re: Circuit board trace repair...
How much current is ir suppose to carry? I'd just replace it with a piece of wire wrap wire if it is less than an amp. Of course, I assume you've fixed what ever failed to cause it to blow. Gold wire is expensive. Dwight From: cctalk on behalf of John Foust via cctalk Sent: Thursday, August 13, 2020 4:20 AM To: cctalk@classiccmp.org Subject: Re: Circuit board trace repair... At 05:33 PM 8/12/2020, Doc Shipley via cctalk wrote: >When I worked for Texas Instruments in '83, we used 30ga 24K gold wire... And these days, that's sold by the inch? - John
Re: Circuit board trace repair...
At 05:33 PM 8/12/2020, Doc Shipley via cctalk wrote: >When I worked for Texas Instruments in '83, we used 30ga 24K gold wire... And these days, that's sold by the inch? - John
Re: Circuit board trace repair...
When I worked for Texas Instruments in '83, we used 30ga 24K gold wire... I use plain wire-wrap wire for board repairs, and from the looks of most of my pre-1990 circuit boards, that's period correct. The only issue I'd have with that 3M tape would be cutting it narrow enough to fit. Otherwise, it's purpose-built for what you're doing. Doc On 8/10/20 4:31 PM, William Sudbrink via cctech wrote: Hi All, I'm going to be attempting to repair, both cosmetically and operationally, a circuit board that had a strip of 12 volt trace "blown off" of it by a short. The fiberglass is clean and there was no solder resist in the affected area. I'm considering using 3M 1183 adhesive tinned foil tape for the job. Has anyone else done this? Could you recommend this or another product? Any tips? Thanks, Bill Sudbrink
Re: Circuit board trace repair...
On 8/10/20 2:31 PM, William Sudbrink via cctalk wrote: > Hi All, > > > > I'm going to be attempting to repair, both cosmetically and operationally, a > circuit board that had a strip of 12 volt trace "blown off" of it by a > short. The fiberglass is clean and there was no solder resist in the > affected area. I'm considering using 3M 1183 adhesive tinned foil tape for > the job. Has anyone else done this? Could you recommend this or another > product? Any tips? > I've used AWG30 wire-wrap wire to accomplish similar repairs. --Chuck
Re: Circuit board trace repair...
On 08/10/2020 04:31 PM, William Sudbrink via cctalk wrote: Hi All, I'm going to be attempting to repair, both cosmetically and operationally, a circuit board that had a strip of 12 volt trace "blown off" of it by a short. The fiberglass is clean and there was no solder resist in the affected area. I'm considering using 3M 1183 adhesive tinned foil tape for the job. Has anyone else done this? Could you recommend this or another product? Any tips? I usually repair these with solid copper wire, but then I'm not trying to make it cosmetic, too. Jon
Re: Circuit board trace repair...
> On August 10, 2020 at 4:31 PM William Sudbrink via cctalk > wrote: > > Hi All, > > > I'm going to be attempting to repair, both cosmetically and operationally, > acircuit board that had a strip of 12 volt trace "blown off" of it by ashort. > The fiberglass is clean and there was no solder resist in theaffected area. > I'm considering using 3M 1183 adhesive tinned foil tape forthe job. Has > anyone else done this? Could you recommend this or anotherproduct? Any tips? > I've never tried it, but maybe one of these pens that draws tracks with conductive ink? https://www.digikey.com/product-detail/en/chemtronics/CW2000/CW2000-ND/1929216 Will
Circuit board trace repair...
Hi All, I'm going to be attempting to repair, both cosmetically and operationally, a circuit board that had a strip of 12 volt trace "blown off" of it by a short. The fiberglass is clean and there was no solder resist in the affected area. I'm considering using 3M 1183 adhesive tinned foil tape for the job. Has anyone else done this? Could you recommend this or another product? Any tips? Thanks, Bill Sudbrink -- This email has been checked for viruses by Avast antivirus software. https://www.avast.com/antivirus
