Electrical Engineering

Questions tagged [lead]

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votes
4answers
645 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
57 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 ...
0
votes
0answers
53 views

connecting three batteries together

I have a scenario of connecting three batteries together. Two are 12V 80 AH and one is 12V 150AH . All are C20. I wish to make it a 24V system of 150AH by connecting the two 80AHs in parallel which ...
1
vote
2answers
138 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
23 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
49 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
59 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
45 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
90 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
73 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
5k 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
59 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
62 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
136 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
399 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 ...