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Transformers

Sci.Electronics.Basics is a worldwide Usenet news group that is used to discuss basic electronics questions.

We found 235 threads matching "transformers"

You are looking at page 1 of 6.

The most relevant threads are listed first

RF Transformers Lead Colors

2007-03-28 10:59:00
Hello everyone, I need to use a RF Transformer in a TV circuit, But i can't find it in my country, So i think to search for it in an old Radio to use it, But they dont write the frequancy on the Transformers like the do on the capacitor, And i know that the slider lead color refere to the feq...RF Transformers Lead Colors

Re: Calculating DC Output Current From Unregulated AC Transformer

The Phantom - 2008-07-17 19:41:00
On Fri, 18 Jul 2008 08:31:49 +1000, "Phil Allison" wrote: > > "John Popelish" > > > If all transformers were manufactured to a single regulation and > > temperature rise standard, > > ** The vast majority on offer do. > > The oft quoted ratio of circa 1.6 applies to stock line...Re: Calculating DC Output Current From Unregulated AC Transformer

Danfoss autopsy

J.E.B. - 2007-03-31 17:44:00
Recently I dissected a danfoss variable speed a.c. moter drive. I found what looked like two transformers with only to wires coming from each. Are these transformers? If so how would this work? anybody familar with danfoss drives? ...Danfoss autopsy

Re: Calculating DC Output Current From Unregulated AC Transformer

Phil Allison - 2008-07-17 18:31:00
"John Popelish" > If all transformers were manufactured to a single regulation and > temperature rise standard, ** The vast majority on offer do. The oft quoted ratio of circa 1.6 applies to stock lines transformers. ..... Phil ...Re: Calculating DC Output Current From Unregulated AC Transformer

Pulse transformers

Sherlock Holmes - 2010-05-13 21:39:00
As i understand, transformers are meant to pass A/C currents, and block DC currents. How then is a pulse transformer created that passes digital pulses through. ...Pulse transformers

Jacobs Ladders & Stacking Transformers?

2007-03-09 15:28:00
I've build a Jacob's Ladder with an old "Franceformer". The specs are: Input; 120 volts - 60 Hz. Output;14,000 volts- 30 Ma. If I wanted a bigger show and had two identical transformers, could I stack them for a bigger arc? Would this even be prudent? If not why not? If it would be possi...Jacobs Ladders & Stacking Transformers?

Re: If you had to build a new junk box, what would you buy to put in it?

ZACK` - 2009-02-24 23:05:00
"Wes" wrote in message news:mJNol.276142$NN4.197081@en-nntp-08.dc1.easynews.com... > Anyone that has played with electronics for a while ends up with a junk > box of various > components. If for some reason you had to start a new one, what are the > basics you would > like to hav...Re: If you had to build a new junk box, what would you buy to put in it?

What limits the current in an unloaded transformer?

FunFred - 2007-11-09 06:21:00
I got to do some experiments recentley and I realise that my understanding of transformers has some holes..... First I got hold of a variac and some resistor loads which I attached to the transformer. The transformer got hot, but not too hot, not much new there. When I wound up the input vo...What limits the current in an unloaded transformer?

Re: need a transformer

ehsjr - 2010-01-19 23:35:00
bob haller wrote: > 120 volt in, 35 volts out 1.2 amps I am having a hard time finding a > 35 or 36 volts out transformer. 2 transformers, 18V secondaries, 120V primaries. Primaries in parallel, secondaries in series in phase. # ----------+ ---+-------)||( ...Re: need a transformer

Re: John Larkin's LC oscillator

George Herold - 2010-06-08 22:07:00
On Jun 8, 1:11=A0pm, Winfield Hill wrote: > George Herold wrote... > > > default wrote: > > > I'd be curious to see values. It isn't "necessary" but I would like > > > to know what core, type, size and material you used. Did you tweak > > > the tuning? Running with banks of them ...Re: John Larkin's LC oscillator

Re: Driving LEDs with a battery pack

Jon Kirwan - 2009-07-20 12:02:00
On Mon, 20 Jul 2009 22:50:13 +1200, greg wrote: > While we're on the subject of transformers, there's > something that's been bothering me about ordinary > (non-flyback) transformers. > > Consider an unloaded transformer. We apply an AC > voltage to the primary, and a small magnetising ...Re: Driving LEDs with a battery pack

SMPS for audio amps

pawihte - 2009-11-12 11:22:00
This is probably a silly question with an obvious answer to those who know: Why are audio amplifiers seldom powered with switched-mode power supplies? The common exceptions I know of are in cases where there are few other options as in car amps or where an SMPS is for used other sections any...SMPS for audio amps

how to id transformers ?

robb - 2007-11-28 23:06:00
i have a couple of mystery transformer pulls {microwave, vcr, clock radio, etc} i try to google codes on trans with no proper hits ... how to id these transformers ? is there a way ? do the numbers have significance on there own ? i want to figure/estimate the ratings they might be useful...how to id transformers  ?

Microwave oven transformers

terryS - 2009-10-28 16:32:00
Just scrapped another m.wave. Wasn't operating properly, was old, the display was faulty and what was showing was meaningless. Also sometimes it had started to microwave for no reason at all when the door was closed. Was afraid it might become hazardous, e.g. operate with door faulty or open! S...Microwave oven transformers

Re: What Germanium PNP transistor do I use?

Homer J Simpson - 2007-03-16 23:46:00
wrote in message news:1174102218.140707.164530@b75g2000hsg.googlegroups.com... > > Michael: > Thanks for your education. But I have an old 4-transistor superhet. > radio schematic and my kits > want to build this radio. So I want to find out what Ge transistors I > need. My radio ...Re: What Germanium PNP transistor do I use?

Current Transformers

RogerN - 2009-09-23 20:59:00
In the winter I use oil filled electric radiators in the house to help even out the heat. The problem is that I always have to remember to shut off the heater to use other appliances on that circuit, such as the microwave oven. If I could use a current sensor, and shut off the heater whenever...Current Transformers

Questions about Current Transformers:

theCase - 2006-08-27 20:32:00
I've got a tentative plan to try and log power usage in my home, here's a summary of the plan: 1) Buy two current transformers like these: http://www.crmagnetics.com/newprod/ProductView.asp?ProdName=CR3110 2) Place one on each "hot" leg of the 240 volts coming into the house, leaving the gr...Questions about Current Transformers:

transformers

2009-01-04 14:32:00
hey guys ! Does anyone know of an individual or a small company that can wind for me 1 torodial transformer to test and if it works well , I will need 3 more. ??? Total of 4 . This is for a experiment that I'm in the middle of. Thanks Bruce ...transformers

a help please

arjun - 2006-11-15 03:49:00
Hello Friends i have a request: Can anyone give a good performance emergency lamp circut for a 11Watt CFL, from 6volt battery, using all readily available components and transformers please? ...a help please

Re: Driving LEDs with a battery pack

greg - 2009-07-20 06:50:00
While we're on the subject of transformers, there's something that's been bothering me about ordinary (non-flyback) transformers. Consider an unloaded transformer. We apply an AC voltage to the primary, and a small magnetising current flows, just enough to induce an emf that balances out the...Re: Driving LEDs with a battery pack

Re: Power Supply Rectification and Smoothing

Eeyore - 2007-10-15 12:55:00
BobG wrote: > maybe just the secondary of a transformer would work? That would probably be a poor choice actually. Transformers are designed for AC not DC. The core will probably just saturate and you'll merely add some DC resistance. Graham ...Re: Power Supply Rectification and Smoothing

more noob questions - transformers

2007-03-28 20:14:00
Ok ... try not to laugh when i ask... tho i only have a few questions on designing a home made transformer.. And of course i dont want to burn my house down.. so lets start from there. I would like to make my own hv transformer and thought i would start by pulling a apart a regular 12 v...more noob questions - transformers

Galvanic disconnection with transformer

Kari Laine - 2010-03-26 13:11:00
Hi, first. Thank you for all the help I have gotten from here so far. Now I am trying to figure out how to connect the electricity to my scopes and the Power supply I am building. I don't know the right term for a transformer which disconnects galvanic connection between the electricity n...Galvanic disconnection with transformer

Re: Radio: Absolute Basics

default - 2009-05-25 19:03:00
On Mon, 25 May 2009 18:53:25 -0400, default wrote: > http://home.pacbell.net/lengal/ip/amregen.pdf > Here's a simple single transistor regen (leave out everything east of > the 4.7 UF cap and connect earphones from the cap to ground - or add > the amp and drive a loudspeaker). Oops - ba...Re: Radio: Absolute Basics

Re: quick emitter follower question

Michael Black - 2006-09-13 19:28:00
Eeyore (rabbitsfriendsandrelations@REMOVETHIS.hotmail.com) writes: > tempus fugit wrote: > > > Hi; > > > > I'm thinking about using a simple 1 transistor emitter follower in an audio > > design (the audio signal will pass thru it). Does the noise figure of the > > transistor need to b...Re: quick emitter follower question

Voltage required

Roger Dewhurst - 2010-08-03 22:02:00
I have an external hard drive, taken from an older computer, in a Dick Smith external enclosure. During a move I got all the transformers mixed up and now I do not know whether this requires 12 volts or 16 volts. Any ideas? R ...Voltage required

Re: Transformer

Jamie - 2009-06-13 20:41:00
Roger Dewhurst wrote: > Some years ago I recall, or at least I think that I do, seeing an > advertisement for a small cylindrical transformer. Do such things exist > and if so what are they used for? > > RD Maybe you're referring to toroidal transformers? http://www.tabtronics.com/...Re: Transformer

Part numbers

J.E.B. - 2007-04-17 17:37:00
Hey everybody, Anyone care to help A newbie figure out what part numbers are all about? what I mean here is... I have many parts ( transformers and such) with only a number stamped on them. Is there Any kind of code or reasoning that corresponds with these numbers? possibly a referance book tha...Part numbers

Re: Hobby electronics projects-- fire safety?

Ken Moffett - 2007-06-29 17:12:00
"David L. Jones" wrote in news:1183085635.939528.231170@m37g2000prh.googlegroups.com: > On Jun 29, 1:37 am, etrave...@hotmail.com wrote: > > I'm a newbie to electronics, but I've come up with a > > project to cool a closed electronics cabinet. It uses an > > ac-dc 12V power (wall war...Re: Hobby electronics projects-- fire safety?

Transformer drawing 1 amp

2007-03-14 08:17:00
I have a transformer that is drawing about 1 amp when the secondary is not in use. Is this normal? Its a 15amp 12V CT transformer. The secondaries read 12 volts from the center like it should(its actually about 13V). It had what I guess what a thermistor(a rectangular box that as stuck inside...Transformer drawing 1 amp

Re: Transformer winding insulation

default - 2008-12-24 10:26:00
On Sun, 21 Dec 2008 22:27:33 -0500, "sbrehler" wrote: > Hello everyone, > > Am I correct in that the winding wire in a transformer is coated with a > varnish that acts as an insulator? I've tried to find an answer to this by > researching transformer construction, but haven't been able...Re: Transformer winding insulation

Re: oscillator needed

Phil Allison - 2007-11-26 23:03:00
> Hi - I need a 10.7 Mhz signal to debug an FM receiver kit I am putting > together. ** No you dont. You maybe need an FM modulated signal at 10.7MHz. > Any suggestions for simple circuitry ? ** Own an FM broadcast radio of any kind? Just tap into the IF strip and ...Re: oscillator needed

inductors and transformer for power electronics book

hossam - 2009-04-12 11:14:00
this book about inductors and transformers and it is use in power electronics application the link: http://rapidshare.com/files/197116503/Inductors_and_Transformers_For_Power_Electronics.rar best regards ...inductors and transformer for power electronics book

Re: signal generator circuit

Michael Black - 2007-02-06 00:07:00
(bob@coolgroups.com) writes: > I'd like to make a circuit that is essentially a signal generator > producing a 400 kHz signal. I think this can be done with a > voltage source, resistor, capacitor, and inductor in parallel. > However, I'm not sure what values are appropriate for the > re...Re: signal generator circuit

Re: Low Voltage lighting vs A.C.

Ross Herbert - 2007-06-15 00:21:00
On Wed, 13 Jun 2007 07:44:23 -0400, "David B." wrote: > I want to do some landscape lighting and wondering if using a 12volt > system(20 watt bulb) is more efficient than normal 120 volt (20 watt Bulb). > It is much safer to use 12V for domestic outdoor lighting. Depending on the n...Re: Low Voltage lighting vs A.C.

wall wart basic question

LB - 2007-02-06 20:01:00
I have a electronic device that uses an OEM ($$$) wall wart rated at 5VDC and 220mA. In my collection of transformers I found one rated at 5VDC with the same plug/ polarity except it's rated at 500mA. Would it be okay to use or should mA ratings match more closely?? Thanks. ...wall wart basic question

Re: An "active" device

Bob Myers - 2007-08-02 21:21:00
"JeffM" wrote in message news:1186102598.910040.275650@z24g2000prh.googlegroups.com... > Trying to define it so that a relay is excluded[1] > but semiconductors used in digital mode aren't is kinda tough. > The definition offered by "Nobody" > http://www.google.com/search?q=define:act...Re: An

Re: Calculating DC Output Current From Unregulated AC Transformer

Paul E. Schoen - 2008-07-19 03:29:00
"Phil Allison" wrote in message news:6eb1v3F67vuuU1@mid.individual.net... > > "Paul E. Schoen" > "Phil Allison" > > > > > > > Ordinary waveform distortion (and normal transformer saturation) will > > > > usually cause a flattening of the peaks > > > > > > > > > ** Where in ...Re: Calculating DC Output Current From Unregulated AC Transformer

Re: Voltage conversion

Eeyore - 2009-05-01 08:06:00
Anon Email wrote: > Hi People, > > I'm an Aussie going to Korea to live for a year or two. I'm bringing > some appliances with me. The Australian rating is 240V/ 50 Hz. Korea > is 220V/ 60 Hz. Will I need a transformer? I read somewhere that > transformers for home use are generall...Re: Voltage conversion

Re: Ferrite Transformer ?

Anthony Fremont - 2007-03-21 15:21:00
mowhoong@hotmail.com wrote: > Some hobby project uses E or Round type of ferrite transformer which > are found in the HV driver > circuit. As this is uncommon or a standard type item, i like to know > how to self made one, It would be helpful if you better described the particular appli...Re: Ferrite Transformer ?
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