Questions tagged [lead]
The lead tag has no usage guidance.
22
questions
0
votes
2answers
63 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
61 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
106 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
34 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
65 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
629 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
805 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
64 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
263 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
0answers
30 views
Balance charging lipo cells with balance charger
I like to build a 14.4 v batterie pack from 4 x 2 lipo cells.
But the balance charger can only handle 6 cells.
In videos it looks like as if the balance lead is connected
between two cells. So that ...
0
votes
1answer
93 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
65 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
61 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
91 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
132 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
7k 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
66 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
70 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
147 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
2k 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
416 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 ...
