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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 124 threads matching "transformers"
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We found 124 threads matching "transformers".

RF Transformers Lead Colors
10:59 28-03-07
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 t... Read More
Danfoss autopsy
J.E.B. - 17:44 31-03-07
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 w... Read More
Jacobs Ladders & Stacking Transformers?
15:28 09-03-07
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 ... Read More
how to id transformers ?
robb - 23:06 28-11-07
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... Read More
What limits the current in an unloaded transformer?
FunFred - 06:21 09-11-07
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 atta... Read More
Re: What Germanium PNP transistor do I use?
Homer J Simpson - 23:46 16-03-07
wrote in message news:1174102218.140707.164530@b75g2000hsg.googlegroups.com... > > Michael: > Thanks for your education. But I have an old 4-transistor superhet. > r... Read More
Questions about Current Transformers:
theCase - 20:32 27-08-06
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/P... Read More
a help please
arjun - 03:49 15-11-06
Hello Friends i have a request: Can anyone give a good performance emergency lamp circut for a 11Watt CFL, f... Read More
Re: Power Supply Rectification and Smoothing
Eeyore - 12:55 15-10-07
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 ... Read More
more noob questions - transformers
20:14 28-03-07
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 ... Read More
Re: quick emitter follower question
Michael Black - 19:28 13-09-06
Eeyore (rabbitsfriendsandrelations@REMOVETHIS.hotmail.com) writes: > tempus fugit wrote: > > > Hi; > > > > I'm thinking about using a simple 1 transistor emitter followe... Read More
Transformer drawing 1 amp
08:17 14-03-07
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... Read More
Re: Low Voltage lighting vs A.C.
Ross Herbert - 00:21 15-06-07
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 n... Read More
Re: Hobby electronics projects-- fire safety?
Ken Moffett - 17:12 29-06-07
"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,... Read More
Re: oscillator needed
Phil Allison - 23:03 26-11-07
> 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. > A... Read More
Part numbers
J.E.B. - 17:37 17-04-07
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 stamp... Read More
Re: signal generator circuit
Michael Black - 00:07 06-02-07
(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 sou... Read More
Re: An "active" device
Bob Myers - 21:21 02-08-07
"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 ... Read More
wall wart basic question
LB - 20:01 06-02-07
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 excep... Read More
Re: Ferrite Transformer ?
Anthony Fremont - 15:21 21-03-07
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 ... Read More
Re: AES One Tube Transmitter
Phil Allison - 23:47 03-12-07
"Dave.H" > I'm thinking of buying the Antique Electronic Supply one tube > transmitter, but I need to swap the transformer over for one that > handles 240 volt, gives out 1... Read More
Re: Fan Motor
00:28 28-04-08
On Thu, 24 Apr 2008 22:53:14 GMT, Rich Grise wrote: > Well, it sounds like it's definitely probably maybe an induction motor. > > Controlling the speed of an induction m... Read More
Re: Regulated 9 Volt DC Power Supply
Jonathan Kirwan - 15:07 28-12-07
On Fri, 28 Dec 2007 07:02:35 -0600, "amdx" wrote: > > It's not hard to find wall warts that are being thrown away or sold > for 50 cents or $1 at yard sales. I have ... Read More
Splitting Audio Signal
Brandon - 00:48 21-11-07
I am thinking about starting a project where I will need to split an input audio signal (from a guitar) into two matching output signals. To put it simply, I need to "Y" an audio... Read More
Re: Low Resistance Measurement
06:29 15-10-07
On Mon, 15 Oct 2007 06:42:00 -0400, "Tom Biasi" wrote: > As for problems with the megger, you could fry things if you don't know what > you are doing. Thanks Tom, tha... Read More
"coupled" Inductors
Jon Slaughter - 20:40 31-03-08
What are the components that are coils of wire that are used like an inductor but are wound on the same bobbin/core? I took a part a dsl filter and I'm trying to determine wha... Read More
Re: Jacobs Ladder
Don Klipstein - 03:32 28-10-06
In , Jonathan Kirwan wrote: > On 25 Oct 2006 07:04:40 -0700, "Chris" wrote: > > > Michael wrote: > > > Hi, > > > > > > I hope you don't mind me posting this here as ... Read More
Re: Amp ratings of power adapters
John Fields - 14:34 23-01-08
On Sun, 20 Jan 2008 15:13:05 GMT, "Thomas G. Marshall" wrote: > > Hugely fundamentally ignorant question. > > If I have an electronics device that claims to take a powe... Read More
Re: How do I know what a 110 volt outlet is?
BobG - 09:49 22-03-08
The interesting tale I heard was that California in the 50s actually had 110v at the outlets and Leo Fender wound his guitar amplifier secondaries to give 550V on the plates of t... Read More
Re: Connecting 200 LEDs to AC (120V)?
nospam - 19:26 13-09-06
"Homer J Simpson" wrote: > > "Homer" wrote in message > news:1158171935.945880.190580@e63g2000cwd.googlegroups.com... > > > The same reason that people put Halogen... Read More
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