Electrical Engineering

Questions tagged [lead]

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11
votes
2answers
748 views

Lead Acid AGM battery testing - Why am I testing it this way?

OK, so maybe it's not fair asking YOU why WE test something the way we do. ;) Here's the thing -- Our company uses AGM Lead acid batteries in some products. The testing methods are ancient (but so ...
0
votes
2answers
72 views

How to use LED holder when mounting on a case with pcb inside?

I am making a case with a front and back piece with the PCB mounted on the back piece with LED supposed to be mounted in the holder in the front case piece. I was planning on soldering the LED to the ...
5
votes
1answer
74 views

I'm having issue getting thick tin-lead 63/37 solder on Alloy 42 lead frame

I'm using Kester 2235 flux and using robotic solder dip so heights are static. I'm measuring thicknesses using x-ray fluorescence, they keep coming up very low. Should I be using an initial scavenge ...
0
votes
2answers
85 views

Ambiguous Lead Exposure in USB Audio Interface

I recently purchased a midtier USB audio interface which I found this warning. Would it be safe to assume that the product just uses lead solder? I know there are sensitive analog components here -- ...
0
votes
1answer
68 views

What is the main factor silver in solder wire?

Previously I was using traditional soldering wire 60/40 Sn/Pb (stannous)(lead). Restriction of Hazardous Substances (RoHS) says that Pb (lead) is dangerous for enviroment. So we should not use lead. ...
0
votes
3answers
108 views

Leads of a particular electrical component

Is lead the most common term used in electronics to indicate the number of connectible input/outputs that a component has? Are there other terms that are used ...
0
votes
1answer
36 views

Choose Extension Lead [closed]

I am trying to understand better the characteristics I need to look at when choosing an extension lead (i.e. an extension cord that plugs into a socket, and gives me multiple sockets on the other end)....
-1
votes
1answer
168 views

How to calculate voltage drop on lead acid battery

I have a motorcycle with an alarm on it. I left the bike for 5 days and the battery dropped from 12.5v to 11.9v a 0.6v drop. The bike still started. 12v battery 9.5 Ah sealed lead acid battery I ...
5
votes
3answers
1k views

How much lead is really on my hands when soldering?

We have an electronic lab where we test and solder. There is a computer in the room as well. I have been wondering how much of that room is really contaminated with lead. We solder, go touch the ...
3
votes
4answers
954 views

12V lead acid charger with LM317 not charging

I have this circuit built and tested. I think this should work and charge the battery with 0.4A to about 13.5V. The Problem: it doesn't charge and between U1 and U3 (Battery) is a current of about 0....
0
votes
3answers
89 views

Can a desolder pump aerosolize lead particulates?

I have been reading up on the dangers of leaded solder. I understand the risk of actually soldering with it are minimal but my question is specifically its removal via "solder suckers." Does this ...
1
vote
2answers
537 views

Why do bipolar electrolytic caps have a long and short lead?

Ok maybe not all, but the Nichicon UES series of bipolar "audio-grade" electrolytic through-hole caps have a short lead and a long lead.. Why? The datasheet has nothing to say about it. This fairly ...
0
votes
1answer
138 views

What is the proper procedure to charge a lead acid battery?

and thanks in advance for your answers. I have a 12v 6Ah lead acid battery, and have been instructed to charge it using a configurable power source. They told me I should use a float charge, ...
0
votes
3answers
74 views

Question about straightening the pins of a resettable polyfuse

I have resettable polyfuses like the picture below. I am working on some PCB boards where I solder the wires myself on the PCB. Because it is very hard/cumbersome work to solder very small wires, I ...
0
votes
0answers
73 views

low impedance as GND and current measurement, applied voltage sharing the same lead

(Image 1 is for the general idea, image2 is for questions 1 and 2, image 3 is for the 3rd question) In the setup shown below, the tuning fork is driven by an AC voltage source being connected to one ...
-1
votes
2answers
92 views

Question about lead acid batteries? [duplicate]

I am having two batteries of different specs (both, dry cell, UPS/inverter batteries) Battery A: 12 V, 26 Ah Battery B: 12 V, 7.2 Ah I need a 24 V output so I have connected them in series. My ...
0
votes
2answers
366 views

Charging a smartphone with lead acid battery [duplicate]

I am trying to do this prototype where I require a smartphone to be charged for a substantial amount of time(probably as long as possible, like months or if possible years). Hence I was thinking of ...
24
votes
6answers
8k views

Why does voltage always lead current by 90 degrees in an inductor?

I have learnt that in an inductor voltage leads current by 90 degrees. However, I do not fully understand why it is 90 degrees. I have been looking everywhere for more information on why this is so. ...
0
votes
1answer
69 views

How does High Purity Lead Solder react with Orthophosphoric acid [closed]

I am currently reviewing all processes and chemicals used in my firm and the one I came across this week is that we are using a high purity lead solder with Orthophosphoric acid. Ignoring the CLAW ...
0
votes
1answer
77 views

Lead acid charging

I am thinking about designing a car battery charge maintainer for long trips/car storage, and use a solar panel as an energy source. All other things aside, a few questions: Can you use standard CC/...
0
votes
0answers
155 views

Removing Lead from surfaces/floors

I have been doing some soldering in my garage, and because of my solder sucker, there is a some lead dust/powder on the table and floor. What would be the best methods for cleaning up as much of this ...
-1
votes
2answers
3k views

Finding proper motor for lead screw lifting?

I need to lift amount 0.6 kilogram up to 20 cm in 2 second with Permanent Magnet DC Motor with PWM speed control driver ,for this device: So i have one PM dc motor with 300 RPM MAX,12 V and 2 Watt ...
1
vote
2answers
4k views

charging a lead acid battery bank with a 19v laptop charger

I am new to the forum and I notice that you have decent positive discussion and tips which also includes noobs on any given electrics related topic, I was requested to post it as a new question here: ...
3
votes
7answers
439 views

Understanding Lead in a causal system

I've gone through school and done all the work but looking back at it i still don't quite get it. The rule is current in a capacitor leads and in an inductor lags. The inductor makes perfect sense ...