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Where to find component differences ?

Discussion in 'Homebrew and Kit Projects' started by W9WD, Aug 6, 2009.

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  1. W9WD

    W9WD Ham Member QRZ Page

    For instance.
    The difference between a 1N4004, 1N4005 or 1N4007 diode.

    I have an old tube amp (Dynaco) that had a selenium rectifier. It is common practice to replace it with one of the previous named diodes. What is the difference and where can I find reference material?
  2. AF6LJ

    AF6LJ Premium Subscriber QRZ Page

    Google is a good place to start, I build a folder full of useful links from my google searches. Old databooks are also a very good source. I hold on to them as I come across them.

    In the above case the only difference between those diodes is the breakdown voltage.
  3. KB9BVN

    KB9BVN Ham Member QRZ Page

    The datasheets will tell you everything you need to know. Google works on most.
  4. K8ERV

    K8ERV Ham Member QRZ Page

    One thing to keep in mind. Seleniums are brutes, not easily damaged by peak reverse voltage spikes, silicons may not be so forgiving. So if you expect or measure spikes, be sure you have enuff PIV in the diode (string) rating, use controlled-avalanche diodes (I think most modern ones are, or suppress the spikes.

    Probably not a problem, but I like to make trouble. Brightens my day.

    TOM K8ERV Montrose Colo
  5. W9WD

    W9WD Ham Member QRZ Page

    I'm sure your hearts are in the right place, but I come to a radio forum and a homebrewing section to talk with people. I can use the faceless, cold "google" but if you are unclear on something in the answer how do you ask it a question?
    I prefer human interaction.
    Often time when a person answers a question they give more insight than a dictionary definition offered by a computer.

    I guess I might have added the line...
    "Please don't tell me to use google."
    ....but thanks just the same
  6. K7JEM

    K7JEM Ham Member QRZ Page

    The short answer was already given. The difference between 1N400x rectifiers is their PIV or peak reverse voltage.

    The longer answer is that every electronic component had a "data sheet". That sheet outlines the parameters of the device. You can find links to different data sheets from the manufacturers, or the vendors. For example, Jameco sells parts, like the 1N4007. If you go to the Jameco site, and find your part, there is usually a link to a data sheet.

    Here is a link to the first data sheet listed. It also lists the other 1N400x numbers, since they are all basically the same, except for reverse voltage:

    Here is a link to another data sheet they have listed, which is better since it has graphs:

    You can get specs on virtually any common type of electronic part this way.

  7. K9STH

    K9STH Ham Member QRZ Page

    The 1N4007 is a 1 amp 1000 PIV silicon diode. Those with lower numbers (starting at 1N4001) have PIVs from 50 volts increasing with each higher number until 7 at 1000 PIV.

    Frankly, any of the 1N400X series can be replaced with the 1N4007. Also, the 1N4007 is usually the cheapest of the lot. I pay 3.5 cents apiece for them in 100 quantity lots from Mouser ( ) and keep them in one of my parts drawers. There is just no sense in keeping around a lot of lower PIV diodes when the 1N4007 diodes are so cheap and will work in place of hundreds of other diode types.

    Glen, K9STH
  8. W9WD

    W9WD Ham Member QRZ Page

    Many thanks
    Terrific answers
  9. K8ERV

    K8ERV Ham Member QRZ Page

    I have a raft (which is slowly sinking) of URLs for semi data I can zip and send if you want to wade thru them. One if my favorites is

    TOM K8ERV Montrose Colo
  10. W9WD

    W9WD Ham Member QRZ Page

    Hey thanks, but I've got what I need at this point. I appreciate the thought though.
    Thank you
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