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  1. PoyntExH

    Recommended reference books for high voltage electronics?

    Hello All, I'm a young engineer working for a company that builds SMPS's in the 5kV-70kV range. I am looking for a handbook on high voltage design techniques. It seems like there are a lot high voltage engineering handbooks geared towards high voltage power transmission for high voltage 60Hz...
  2. PoyntExH

    Need a 40V input rated version of the lm7815 regulator.

    Hahaha, yeah goodness I didn't know such things existed either! My boss was bound determined to find something. At first he had a part in mind that he used back at college - it was a similar buck regulator, but its switching transients were so bad that it required an awful LC filter on the...
  3. PoyntExH

    Need a 40V input rated version of the lm7815 regulator.

    I had forgotten when I originally posted this that the 24V rail gets turned on separately since its for a completely different circuit and can't be used with the 7815. The TPS7A4901DGNR that I found on digikey can only handle up to 35V and since this is a through-hole board it would be rather...
  4. PoyntExH

    Need a 40V input rated version of the lm7815 regulator.

    I'll have to check to see if we can run the 24V buck into the 15V reg. I am hesitant to do this since it may produce unwanted transients into the circuitry that runs off the 15V rail. We were thinking of using a 30V zener diode to bring the voltage back down, though it would be nice if we...
  5. PoyntExH

    Need a 40V input rated version of the lm7815 regulator.

    Hello all, I am working on a power supply board which has produces 15V, and 24V outputs. The transformer we're using outputs roughly 36-37VDC unfiltered which gets sent into a lm7815 regulator to make the 15V output, we can't use a transformer with lower output because we need the higher...
  6. PoyntExH

    Measuring relatively high static and pulsed magnetic fields

    MagMike: But can these particular Hall Sensors that can interface with an arduino measure up past 2 Tesla? Also the speed of most Hall sensors I think should be ok for my purposes since the high inductance of the magnet windings should cause the current pulse in the magnet to rise slowly...
  7. PoyntExH

    Measuring relatively high static and pulsed magnetic fields

    I checked the forum as best as I could before posting to make sure that I'm not re-asking a common question, though please forgive me if this has been answered in another post. I have some experience in using linear Hall Effect transducers; however the ones that I used could only measure field...
  8. PoyntExH

    bipolar tvs

    Well what all specs are you looking for? How much steady state power will you be running through it, what clamping voltages do you need, and what do you expect your transient power to be? Have you checked out the 1.5KE series from littelfuse? They have a whole bunch of clamping voltage rated...
  9. PoyntExH

    Need help designing a single shot igbt driver

    haha. Well it does so happen that I have a few lying around here and the irf510's gate capacitance looks low enough that I should be able to switch it on fast enough with the 7555 so unless anyone else has a better idea, when I get back to it I'll give it a go with the irf510.
  10. PoyntExH

    Need help designing a single shot igbt driver

    Yeah I was doing some more reading today and I found some application note talking about how the linear region of the IGBT is extremely lossy, and we want to avoid it at all costs. It makes sense. Would it be better to try to have the LM7555 driving a small mosfet like a IRF510 to buffer the...
  11. PoyntExH

    Need help designing a single shot igbt driver

    Hi all. I am using a 1200v 400a igbt to drive a large pulsed soleniod with a single pulse with a pulse width of about 3 milliseconds. When in use, the solenoid is only pulsed once every few minutes. Current in the pulse is usually about 400A. What I want is to make or use a simple driver with...
  12. PoyntExH

    Capacitor Leakage Testing and Acceptable Leakage

    Hello. I am trying to test some used 450V 12000uF electrolytic cornell dublier capacitors. I do not know the age of these capacitors, nor what conditions that they were used in. Visually I can tell by their terminals that they were once used, though they look pretty new and to me their...
  13. PoyntExH

    Does anyone have experience with non-heat treated Vanadium permendur, aka hiperco 50?

    dgallup, do you know of any sources and what price they would charge for the magnetic anneal? Bob Rossi told me he heard it was about $1200 for the dry H2 and roughly $700 or so for a vacuum anneal, haven't heard about argon. One thing I never understood, isn't it rather dangerous to be using...
  14. PoyntExH

    Does anyone have experience with non-heat treated Vanadium permendur, aka hiperco 50?

    I have purchased a small quantity of Hiperco 50A from scientific alloys. They do not perform the ASTM standard dry hydrogen anneal on the hiperco, and since the cost of anneal is extremely expensive, I've decided use it as is. I had spoke with Bob Rossi from scientific alloys for about an hour...

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