DC transformer

Started by Piotr Wyderski in sci.electronics.design2 years ago 57 replies

www.paytongroup.com/webfiles/files/OTS350.pdf Read carefully. It seems I have always underestimated the technological progress......

www.paytongroup.com/webfiles/files/OTS350.pdf Read carefully. It seems I have always underestimated the technological progress... :-) Best regards, Piotr


simple transformer Q

Started by Yzordderrex in sci.electronics.design3 years ago 3 replies

I am calculating AC flux density again. (I do this every few years.) I recall some formulas use 4.0 in the denominator and others use 4.44....

I am calculating AC flux density again. (I do this every few years.) I recall some formulas use 4.0 in the denominator and others use 4.44. I think it has to do with waveshape but my dementia seems to be taking over. thanks, Bob N9NEO


RF galvanic isolator ...

Started by halong in sci.electronics.design10 years ago 34 replies

Hi all, I have a 200 MHz clock signal to send across the barrier of 5 KV I'm thinking of some RF transformer - perhaps "air core" ... but...

Hi all, I have a 200 MHz clock signal to send across the barrier of 5 KV I'm thinking of some RF transformer - perhaps "air core" ... but can't find any good candidate


Magnetics question.

Started by Syd Rumpo in sci.electronics.design6 years ago 25 replies

Are there any reasons why I can't use a common-mode choke as a 1:1 transformer, assuming the inductance is ok? I'm too lazy to wind a...

Are there any reasons why I can't use a common-mode choke as a 1:1 transformer, assuming the inductance is ok? I'm too lazy to wind a toroid, and it seems to work fine. Cheers -- Syd


UM Electronic

Started by Winfield Hill in sci.electronics.design6 years ago 2 replies

Anybody ever hear of UM Electronic? They made the FX0176 transformer with EE25 core for the eval board for MPS HFC0300 35-watt offline...

Anybody ever hear of UM Electronic? They made the FX0176 transformer with EE25 core for the eval board for MPS HFC0300 35-watt offline power supply. -- Thanks, - Win


Planar transformer Question

Started by Yzordderrex in sci.electronics.design7 years ago 4 replies

I have to design a power supply with 600v isolation, 12 outputs are 15v at 10mA per channel. I was wondering if the typical strategy with this...

I have to design a power supply with 600v isolation, 12 outputs are 15v at 10mA per channel. I was wondering if the typical strategy with this type of construction is to use buried vias. thank you Bob N9NEO


Pyrography

Started by en2 in sci.electronics.design7 years ago 11 replies

Hello. Did any of you worked on pyrograph construction? So, a not interested in the version with PC power supply ( maybe as last option )....

Hello. Did any of you worked on pyrograph construction? So, a not interested in the version with PC power supply ( maybe as last option ). I'm interested in to make this with some 24/10A transformer. Now, i have few transformers in the garage ( 24V, one from the microwave, and last one is standard 12V/5A (that last one would probably be to weak for such project) Has any of you done...


IC labelling, new style

Started by Winfield Hill in sci.electronics.design5 years ago 13 replies

A flyback controller IC, used with external MOSFETs and a flyback transformer for 12V to 450V, 20 watts. ...

A flyback controller IC, used with external MOSFETs and a flyback transformer for 12V to 450V, 20 watts. https://www.dropbox.com/s/nkmfxml8y9so9lp/flyback-contoller_IC.jpg?dl=0 -- Thanks, - Win


QSC GX3

Started by Anonymous in sci.electronics.design6 years ago 4 replies

About to throw in a set of outputs in one and noticed something about the circuit. It is not DC coupled. Or is it ? It has positive and...

About to throw in a set of outputs in one and noticed something about the circuit. It is not DC coupled. Or is it ? It has positive and negative supplies but there is no center tap on the transformer secondaries. Bottom line is there is no DC path, it all goes through the two 4,700 uF filter caps. I have been considering the ramifications of this, and am trolling for commen


Tertiary feedback winding

Started by mldelibero in sci.electronics.design9 years ago 12 replies

I am planning on winding an isolation transformer to couple an AC signal onto a DC source. The load will be capacitive and I plan on varying...

I am planning on winding an isolation transformer to couple an AC signal onto a DC source. The load will be capacitive and I plan on varying frequency, so I would like to investigate using a third winding to regulate the output pk-pk. Does anyone have any good references/thoughts on this?


HV flyback design theory?

Started by Anonymous in sci.electronics.design2 years ago 38 replies

Hi all, I apologize for the probably too stupid questions, but it's a totally new electronic territory for me and I don't seem to be finding...

Hi all, I apologize for the probably too stupid questions, but it's a totally new electronic territory for me and I don't seem to be finding the needed theory articles and/or books to help me. I would like to re-use some old BW TV's HV transformer to power the CRTs in X-Y mode (all the yoke changes and drivers are already done). I'd just need the Anode supply and the G2/G4 supplies that...


power transformer inductance

Started by bitrex in sci.electronics.design6 years ago 10 replies

I'm wondering if anyone knows the approximate inductance of the primary and secondary on one of those little 1 watt 120-12.6 power...

I'm wondering if anyone knows the approximate inductance of the primary and secondary on one of those little 1 watt 120-12.6 power transformers, at _audio frequencies_ (~15kHz)? -- ----Android NewsGroup Reader---- http://usenet.sinaapp.com/


Audio transformer impedance

Started by bitrex in sci.electronics.design6 years ago 11 replies

I'm using one of these little PCB mount impedance matching transformers "backwards" in my junk box cap charger, and am trying to select a...

I'm using one of these little PCB mount impedance matching transformers "backwards" in my junk box cap charger, and am trying to select a value of DC blocking capacitor to put in front of it. I think I've been trying to use a value of a few nanofarads in the prototype and it's not right, there is a lot of ringing and nastyness coming out of the secondary. Here is the datasheet on th...


easy transmission-line transformer

Started by John Larkin in sci.electronics.design4 years ago 17 replies

https://dl.dropboxusercontent.com/u/53724080/Circuits/TxLines/Pot_Core_TXline.JPG -- John Larkin Highland Technology,...

https://dl.dropboxusercontent.com/u/53724080/Circuits/TxLines/Pot_Core_TXline.JPG -- John Larkin Highland Technology, Inc picosecond timing precision measurement jlarkin att highlandtechnology dott com http://www.highlandtechnology.com


Best Way To Power This ?

Started by Anonymous in sci.electronics.design2 years ago 6 replies

I got these two pieces of equipment. One is a Data Precision benchtop DMM. It had a bad power transformer. It runs on a shunt Zener regulation...

I got these two pieces of equipment. One is a Data Precision benchtop DMM. It had a bad power transformer. It runs on a shunt Zener regulation using the impedance of the transformers. not something I would have done. But it's current drain is in the mA, maybe 100 or so. Might be a bit more if I happen to be reading 88.888 volts, it is LED. I prefer that, I find it easier to see a


Royer oscillator - phasing dots

Started by John S in sci.electronics.design1 year ago 19 replies

https://en.wikipedia.org/wiki/File:Royer_oscillator.gif I think the transformer phasing dots are wrong. Or, am I wrong?

https://en.wikipedia.org/wiki/File:Royer_oscillator.gif I think the transformer phasing dots are wrong. Or, am I wrong?


Magnetic circuit simulation request

Started by m II in sci.electronics.design8 years ago 41 replies

I have no experience using the programs available for finite element analysis and don't have the time to learn how to use one.. If...

I have no experience using the programs available for finite element analysis and don't have the time to learn how to use one.. If someone experienced with their use could run a simulation, it would be of great benefit. I have a microwave oven transformer of 1000W rating. I would like to remove the "I" part of the core, leaving the "E" segment, along with the windings. What I am i...


Mains powered variable resistance

Started by Raveninghorde in sci.electronics.design9 years ago 23 replies

I was given an interesting spec by a customer. He wants a wall mount RH sensor with a resistive output which emulates a 3k NTC thermsistor...

I was given an interesting spec by a customer. He wants a wall mount RH sensor with a resistive output which emulates a 3k NTC thermsistor curve. So 0% RH is about 10k, 25% 3k, 50% 1k etc. However the only power available is 230V ac and there is no space for a transformer. And the design is cost sensitive as the quantities are good. The first batch of 5000 are needed in 8 weeks. So Th...


some flyback switchers

Started by John Larkin in sci.electronics.design7 years ago 35 replies

I need maybe +750 volts at low current, 15 mA maybe. Here are some attempts to recover some of the leakage inductance energy and keep...

I need maybe +750 volts at low current, 15 mA maybe. Here are some attempts to recover some of the leakage inductance energy and keep the transformer affordable. https://dl.dropboxusercontent.com/u/53724080/Circuits/Power/Flybacks.JPG I got some quotes on PCB mountable HV bricks, and the prices were insane. Maybe I'll make my own, which is more fun anyhow. -- John Larkin ...


Galvanic isolation without transformers ??

Started by Anonymous in sci.electronics.design7 years ago 60 replies

Could some electronics guru please help ? Maybe this is a very silly question, so please pardon me. A voltage transformer is used to provide...

Could some electronics guru please help ? Maybe this is a very silly question, so please pardon me. A voltage transformer is used to provide galvanic isolation, in a power supply, amongst other features. Is there another way to achieve galvanic isolation ? Thanks in advance.