[time-nuts] Need help with transformer core

Thanks for the inputs everyone, One of the direct replies got me the data I needed! Alex, I'd like to by it that way, but A 24VDC input 3700VDC output at 4ma does not seem to be available! Cheers, Corby Hi Corby, The way I would approach the problem would be not ask where to get a given

Re: [time-nuts] Need help with transformer core

Hi Keep in mind that the supply in question is likely running in the vicinity of an atomic clock. Things like stray magnetic field are pretty important if that’s the case …. It’s also quite possible that the original supply had some “supply dies not the tube” features built into it. Bob On

Re: [time-nuts] Need help with transformer core

forward converter [not fly -back] look for pot-cores material 3C80, 3C81, 3C85 or equivalent, you will need a cca 21 to 28mm dia pot-core if you run it at 80 to 120kHz, driver ic TL495 , which is a PWM push pull controller estimate the efficiency for 60% for the input power, look for very good

Re: [time-nuts] Need help with transformer core

On Sat, 30 Aug 2014 01:58:40 + Mark Sims hol...@hotmail.com wrote: Frankly, anybody that builds up a Simple Switcher type converter from scratch is more than a little nuts and/or awfully lonely. You can buy small, adjustable pre-built boards (buck or boost configs) off of Ebay for as

Re: [time-nuts] Need help with transformer core

Attila Any opinion or observation on Mean Well's SD series, they are a key component on most of our projects. Bert Kehren In a message dated 8/31/2014 6:51:13 A.M. Eastern Daylight Time, att...@kinali.ch writes: On Sat, 30 Aug 2014 01:58:40 + Mark Sims hol...@hotmail.com wrote:

Re: [time-nuts] Need help with transformer core

Hoi Bert, On Sun, 31 Aug 2014 07:15:02 -0400 (EDT) Bert Kehren via time-nuts time-nuts@febo.com wrote: Any opinion or observation on Mean Well's SD series, they are a key component on most of our projects. I never had the pleasure to measure any of the Mean Well DC/DC converters. Looking at

Re: [time-nuts] Need help with transformer core

Thanks for the reply in all applications the DC DC converter is used for isolation and followed by linear regulators. In critical stages like dual mixer two stages. Bert In a message dated 8/31/2014 11:12:18 A.M. Eastern Daylight Time, att...@kinali.ch writes: Hoi Bert, On Sun, 31

Re: [time-nuts] Need help with transformer core

So we're nuts. I thought that was a given. David On 8/29/14 9:58 PM, Mark Sims wrote: Frankly, anybody that builds up a Simple Switcher type converter from scratch is more than a little nuts and/or awfully lonely. You can buy small, adjustable pre-built boards (buck or boost configs)

[time-nuts] Need help with transformer core

I'm trying to built a DC to DC from an existing schematic for a frequency standard I'm working on. The transformer core is identified as an Indiana General F1152-1-6 The Dc to Dc is running at 22Khz and maybe 20 Watts. Can't find any info that would allow me to decide on a proper substitute.

Re: [time-nuts] Need help with transformer core

Hi Corby, I have the old data on that Indiana General part: it seems to be O-6 material - 4700 initial perm, 6000 max perm, up to 0.5 MHz, 210 degree C curie point - and F1152-1 is a 36x22 mm ungapped ferramic pot core - AsubL min =11530. If you need more data, I can probably scan the relevant

Re: [time-nuts] Need help with transformer core

cdel...@juno.com said: The Dc to Dc is running at 22Khz and maybe 20 Watts. Can't find any info that would allow me to decide on a proper substitute. Anybody out there have any data on this? National Semiconductor had a few app-notes that were cookbooks for using their chips to build DC-DC

Re: [time-nuts] Need help with transformer core

Hi Do you just have the core info or do you have the winding information as well? Bob On Aug 29, 2014, at 6:11 PM, cdel...@juno.com wrote: I'm trying to built a DC to DC from an existing schematic for a frequency standard I'm working on. The transformer core is identified as an Indiana

Re: [time-nuts] Need help with transformer core

Rather than start from old design, you might just want to look at the online design tools and matching core selections for simple switcher boost and buck datasheets/app notes, or SG3524 type transformer converters. The major distributors carry inductors in their catalogs that are just to match

[time-nuts] Need help with transformer core

Frankly, anybody that builds up a Simple Switcher type converter from scratch is more than a little nuts and/or awfully lonely. You can buy small, adjustable pre-built boards (buck or boost configs) off of Ebay for as little as a dollar each... including shipping from Old Cathay. I usually

[time-nuts] Need help with transformer core

Thanks for the inputs everyone, One of the direct replies got me the data I needed! Alex, I'd like to by it that way, but A 24VDC input 3700VDC output at 4ma does not seem to be available! Cheers, Corby ___ time-nuts mailing list --

Re: [time-nuts] Need help with transformer core

Corby, Assuming that what you want to do is find a substitute for the F1152, you should be aware that schematics don't give you enough information to build one from scratch. The easiest thing to do is buy one from a catalog of DC-DC converters with the appropriate voltages and power - unless the

[time-nuts] Need help with transformer core

There are actually quite a few makers of what you seek... EMCO H40P will do 3.75 mA at up to 4000V... voltage selected by a 0..5V input. Also check out PPM's offerings... http://www.ppmpower.co.uk/high_voltage_dc_dc_converters/ And UltraVolt's 4AA series: