BGA soldering debate

Started by John Larkin in sci.electronics.design48 minutes ago 5 replies

If a BGA has lead-free balls, is it OK to solder it with leaded solder, using a temperature profile that melts the solder on the board, but...

If a BGA has lead-free balls, is it OK to solder it with leaded solder, using a temperature profile that melts the solder on the board, but doesn't melt the ball? Seems OK to me; we're soldering the ball to the board. There seem to be references that say it's OK, and others that say the balls must melt. The high-temp profile affects some other parts, and tends to bake flux ehough th...


LiPo charging

Started by Andy in sci.electronics.design55 minutes ago 1 reply

Can I use the same charger I use for my 18650 batteries with a LiPo battery? LiPo battery is 500 mah. Charger puts out 450 ma. Thanks.

Can I use the same charger I use for my 18650 batteries with a LiPo battery? LiPo battery is 500 mah. Charger puts out 450 ma. Thanks.


OT: Wouldn't sell for $100K in AZ

Started by Jim Thompson in sci.electronics.design1 hour ago 30 replies

Wouldn't sell for $100K in AZ... ...Jim Thompson -- | James E.Thompson ...

Wouldn't sell for $100K in AZ... ...Jim Thompson -- | James E.Thompson | mens | | Analog Innovations | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | ST


Need Op Amp for design

Started by Leslie Rhorer in sci.electronics.design2 hours ago 22 replies

I have a little project am trying to design, and I am running into a little difficulty in the concept stage. I have a device that needs to...

I have a little project am trying to design, and I am running into a little difficulty in the concept stage. I have a device that needs to consume essentially zero power when shut off. A few nanoamps is fine. The device uses a 6S LiPo battery that must be monitored during operation to make sure the battery is not discharged beyond critical limits. To this end, the battery is conn


Switch Types

Started by rickman in sci.electronics.design2 hours ago 34 replies

I considering switch types for time sensitive applications like a Morse code key, I'm wondering if the type of switch and contacts will have a...

I considering switch types for time sensitive applications like a Morse code key, I'm wondering if the type of switch and contacts will have a bearing on the timing and the "feel" of a human operated device. I know mechanical contacts have been used for this over many decades. Mechanical switches have their issues, mostly the contact wear and reliability, but they also have to be deboun...


Not sure about Manufacturers response

Started by amdx in sci.electronics.design3 hours ago 9 replies

I ask Laird EMI Products a question about a graph of Z regarding their Ferrite beads made to choke coax. Each bead has between 9 and 62 ohms...

I ask Laird EMI Products a question about a graph of Z regarding their Ferrite beads made to choke coax. Each bead has between 9 and 62 ohms Z. (depends on geometry) Here's the graph on page 3.> https://assets.lairdtech.com/home/brandworld/files/Catalog_FERRITE%20CORES%200717.pdf I ask if they have a graph that separates the R and XL. Thinking Z is a phasor of XL and R. They respond


Getting ELF Out of a Sound Card Using EMF Cancellation

Started by Robert Miller in sci.electronics.design6 hours ago 46 replies

PC audio editing software like Adobe Audition, Goldwave and Audacity is handy for signal generation. You can mix, modulate, add envelopes, etc....

PC audio editing software like Adobe Audition, Goldwave and Audacity is handy for signal generation. You can mix, modulate, add envelopes, etc. without building hardware. One drawback is the inability of the sound card to pass ELF's. The usual solution is to modulate the ELF on an audio carrier and then filter it back out. However, I was wondering about a simpler solution as follows...


Win7 command prompt questions

Started by Bill Bowden in sci.electronics.design8 hours ago 6 replies

I have a netbook running Win7 and I want to use the command prompt to run a DOS version of Turbo Basic. I can get it to run but I have to type...

I have a netbook running Win7 and I want to use the command prompt to run a DOS version of Turbo Basic. I can get it to run but I have to type in CMD into the start search menu to open the DOS window and then I have to change directories to start Turbo Basic and then load the program. I also can't get the command prompt window to run in full screen. I'm wondering if there's a way to plac...


Phone Charging

Started by rickman in sci.electronics.design9 hours ago 7 replies

A friend has an old Motorolla W376g phone and the charger can't be found. I can get it to charge from a car charger I use as well as from a...

A friend has an old Motorolla W376g phone and the charger can't be found. I can get it to charge from a car charger I use as well as from a desktop multi-outlet charger I have. But a couple of different wall wart chargers won't charge it while they will charge any of my devices. I did a search and can't find any details on why this might not work other than that Motorola warns to only...


MPPC amplifier

Started by Fitzgerald in sci.electronics.design9 hours ago 4 replies

I'm looking into low-light detection using MPPC's and I am testing using the Hamamatsu C12332-01 evaluation module. I am looking for general...

I'm looking into low-light detection using MPPC's and I am testing using the Hamamatsu C12332-01 evaluation module. I am looking for general hints, tips and tricks to maximize the performance of these modules. We'd like to have a measure for the total amount of photons collected every 20-100ns (exact timing t.b.d.) One of the things that surprised me was that the frontend of the eval...


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