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Sci.Electronics.Basics
Sci.Electronics.Basics is a worldwide Usenet news group for discussion of electronics where there is no such thing as a stupid question. Beginners questions. Discussion of electronics education. Requests for other sources of information.

We found 260 threads matching "coil"
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We found 260 threads matching "coil".

Coil wrapping ?
mowhoong - 10:47 06-09-07
I had seen a coil wrapped in twin wire. If I design a coil with 1000 T, I use two wire together, so it mean that I only wrapp 500 T, hence it save my time and work.Dear members... Read More
Re: small, battery powered stepper motor
BobG - 13:02 07-05-07
One problem with stepper motors is that one coil is always on.... a 'trick' to reduce the holding current is stick an R in series with each coil. Use 4 outputs... a pair for each... Read More
Re: Which way is better, zener or resistor
John Popelish - 19:57 18-08-07
Allen Bong wrote: > I have a 12V relay and I wanted to operate it with 18V supply. Could > I use a 6V 1W zener to drop the extra 6V from the supply or is it > better to use ... Read More
555 timer help
Bob1001 - 21:57 02-12-07
I am new to this newsgroup, I am typically a poster on rec. pyro or metalworking, but I have been working on a new project. I am trying to make an ignition coil for my new turbi... Read More
Re: Looking for simple and reliable voltage doubler 12->24v
JeffM - 16:51 05-03-07
rkremser wrote: > This will be used to drive two air solenoid valves for shifting and clutching. The solenoid valves I have seen have 2 parts: the valve body and the coil. Yo... Read More
Coils
KBSoftware - 19:31 11-08-07
I a bit new to electronics, about 1. Now I'm learning about coils, and have a few questions. I have some coils and I know their Henry rating, I've found a lot of information... Read More
Re: Looking for simple and reliable voltage doubler 12->24v
rickman - 09:52 05-03-07
On Mar 3, 7:51 pm, "Homer J Simpson" wrote: > "jasen" wrote in message > > news:escohr$fmt$1@jasen.is-a-geek.org... > > > > Then you need to use a transformer - pr... Read More
Re: Switching AC w/ Logic Level
Jamie - 20:03 31-05-07
jecottrell65@gmail.com wrote: > I've found a few threads but nothing with exactly looking for what I'm > looking for. > > I need to switch 24VAC (HVAC control) and 120VA... Read More
12V relay surging
02:24 19-05-07
One problem here hopefully I can get this to work.. I wired a an automotive relay to drive a 12VDC RV water pump. from a power supply, 12V+ going to 30 and 87 output to pump. ... Read More
sizing a freewheeling diode for a coil
Matt - 23:28 01-06-07
I am controlling the coil of a relay using a switching transistor. To protect the transistor I intend to use a freewheeling diode in parallel with the coil. I'm not sure of t... Read More
Re: Will the LM393 drive a small relay?
John Popelish - 12:03 24-04-07
Bob wrote: > I need to switch on a relay with the output of the LM393. The relay > is a 5vdc unit from RadioShack. Does the LM393 have what it takes to > trigger this relay... Read More
What to use to hold Coil Windings in Place?
Archimedes - 21:55 26-03-08
Hi All Can anyone suggest whats best to use to hold the windings of an Air Coil with about 7 turns, about 12mm long - I know i can use polystyrene cement but are there any oth... Read More
meaning of impedance(about imaginary part)
kanica - 07:34 27-02-08
When I measured impedance of the RF system, I discoved decreasing imaginary part(minus value). but!! it is minus value(like -5 -10 -12...) and the real part of impednace was incr... Read More
Vehicle detector
Roger Dewhurst - 16:52 12-09-06
Would a multi turn coil, a metre or two in diameter, buried beneath the surfce of a driveway, with the ends of the coil connected to the input pins of a operational amplifier ser... Read More
Re: Using a relay
John Popelish - 11:33 24-04-07
Jan Nielsen wrote: > I got a relay I cant figure out how to use, it as 5 connectors. > > Its a finder 36.11.9.005.0000 5V(dc) 10A 250V(ac), I dont have a > datasheet for ... Read More
Coil driving
Nuby - 13:58 13-10-07
What's wrong with this picture? TTL control lines with small current sinking capability (say 20ma) need to activate electromagnetic coils (50VDC, 300ma). Each control line ga... Read More
radio transmissions at the frequency of light
jjoensuu - 21:39 16-01-07
Hi all, just wanted to ask, what would be the problems that make it difficult/impossible to build a radio that transmits at the frequency of visible light (between 430 and 750... Read More
What happened? Solenoid mystery.
Eric R Snow - 22:50 20-03-07
I have a solenoid actuated air valve that only occasionally is operated. It is meant to be operated with 24 volts DC. I plugged in a wall wart power supply and the solenoid just ... Read More
Tesla coil parts - where to salvage?
Kasterborus - 14:11 13-02-08
Hi, I'm trying to put together a Tesla coil following plans for a vacuum tube based design. I need to find the following parts, and wondered if these could be salvaged from... Read More
Current meter using GMR
Gianni Mariani - 22:20 13-10-07
I've come up with some ideas that use GMR (http://en.wikipedia.org/wiki/Giant_magnetoresistance) to measure current flowing in a wire. Does anyone have a similar idea ? T... Read More
Re: How to test for Q of LC circuit unloaded
john jardine - 17:19 09-10-07
"Bill Bowden" wrote in message news:1191900214.160658.230750@o3g2000hsb.googlegroups.com... > I have a ferrite rod antenna that measures a Q of around 200 unloaded > usin... Read More
240V relay contact suppression
MarkMc - 14:02 21-08-06
Hi I'm using a relay with 240VAC coil and 240VAC contacts. From what I've been advised before with relays (not 240VAC), I understand it's a good idea to protect the contacts ... Read More
Blown resistor in automotive latching relay
AshMan40 - 21:52 24-04-07
Hi all. This is my first post to this NG forum, so please be kind. I am trying to repair a 12v latching relay for my Volkswagen Beetle (~1975). It controls the dimming of the... Read More
Re: Capacitor size
w_tom - 19:04 30-08-07
On Aug 30, 8:49 am, Jan Nielsen wrote: > I have solved some of the problem with capacitors, its not perfect, but > alot better than before. > > I added .... > > It ... Read More
3 pole dc motor with commutator?
BobG - 14:10 24-03-07
The standard slot car motor was a 3 pole mabuchi motor with two magnets on the side of the case. The poles were 120 degrees apart. I assume that every 60 degrees, the next pole w... Read More
Re: FM Crystal Radio
Mike - 20:31 23-12-07
> > That's exactly the same circuit I was looking at. Uses a small > diameter coil so I can build a set into a plastic project box. How > many meters of wire would a need ... Read More
Best method for remote control of a PSU
Hammy - 09:16 24-08-07
What is the best method for remote control of a PSU just to control switching it on and off? I was looking at data sheets for relays DPDT but they all seem to require a holding c... Read More
Re: Problem with Relatives watching Excessive TV their Addicts? [Heidi
Grostle News - 15:36 04-02-07
Hi Heidi, you wrote: > Problem with Relatives watching Excessive TV > their Addicts? Is there an electronic mini tv > remote control that will jam the tv either switch > it ... Read More
Re: Newbie (ignorant) tech question
default - 17:51 05-01-07
On Fri, 5 Jan 2007 11:06:15 -0700, "Dan Beck" wrote: > Hello all, > > I have a constant duty AC (28 VAC) motor that runs in one of my pinball > machines. I wish to con... Read More
Looking for some ideas for DC motor control
Eric R Snow - 19:49 25-08-06
Greetings All, I'm working on a device to pull wire for welding. The mechanical part is done and now I'm trying to figure out how to do the motor speed control. I thought that a... Read More
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