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  1. (*steve*)

    My Little Pony fan thread

    From the original thread: https://www.electronicspoint.com/newb-has-question-t253157.html Moooooo! :D
  2. (*steve*)

    Ye olde Fluke

    I just received my 0.005% 10k resistor and my 0.01% 100 ohm resistors today. I bought them to set up a poor man's resistance standard to test my meters. My 1979 vintage Fluke 8375A (that I also got the manual for today) reads the 10k resistor as 9997.7 ohms, and the 100 ohm resistor as 100.020...
  3. (*steve*)

    Book Reviews

    OK, this is a trial. If you feel there is a really good (or really bad) book that you've read, write a review here. I will probably incorporate particularly good reviews into this post. Please also feel free to discuss books in this thread. I'll start it off. The Art of Electronics...
  4. (*steve*)

    SMPS boost regulator using a schmitt trigger oscillator

    Yesterday I was designing the board etc., for a 10V voltage reference I'm building. For various reasons I want it to be battery powered, and because I need between 14 and 18 V input, I decided initially to use a pair of 9V batteries. This has the advantage of working until the batteries are...
  5. (*steve*)

    For Sale: (FREE) NEC D8279C

    If anyone has a need for one of these chips, I have a few that I'm prepared to give away. Here is the datasheet. Weirdly, I find these for sale on eBay. They're in Australia. I'll ship anywhere. You pay the postage.
  6. (*steve*)

    Electrical standards (of a sort)

    OK, what I want to see now is a list of commonly used devices and their measurement in terms of ammunition. :D
  7. (*steve*)

    Attaching images

    We often get asked how to attach images. There are 4 ways. 1. Linking to images There are three ways.The first is to click on the button that looks like this: and type in the URL of an image. (Realistically you'll cut and paste it). Make sure the image is available to everyone. If it is a...
  8. (*steve*)

    I don't want to get naked with you...

    ...so please don't ask. And for anyone who doesn't get it --> clicky
  9. (*steve*)

    Higgs Boson

    God has been found. And his name is Mr Higgs... Just kidding. I tuned into the broadcast of the announcement about ten minutes prior to the phrase "five sigma" being uttered, followed by sustained applause. I will admit to understanding little else that was said. But I know where I was when...
  10. (*steve*)

    Resistance reference

    Let's say I wanted to create a reference resistor and I have access to plenty of 1k 0.1% 25ppm resistors. I realise that the math says the tolerance will remain the same no matter how I connect them (since they may all be 0.1% high, for example). But if they are assumed to have a value which...
  11. (*steve*)

    6.002x students -- PLEASE NOTE

    Those students doing 6.002x are reminded that the discussion forum provided by MITx exists for a reason. If you come here asking for answers to your 6.002x homework, we're going to try our best not to give them to you. I personally don't have much objection to answers being posted AFTER the...
  12. (*steve*)

    Anyone played with rubidium frequency standards?

    I've just wired up mine and gotten a nice looking 10MHz signal out of it. Has anyone played with these? It takes about 2:30 to stabilise from "warm" i.e. off for about half an hour. Does that seem reasonable? I'll measure it again from cold tomorrow. I mounted it on a huge heatsink...
  13. (*steve*)

    Long duration timers - Notes for beginners

    (*steve*) submitted a new resource: Long duration timers - Notes for beginners - Tips for beginners on long duration timers. Read more about this resource...
  14. (*steve*)

    MIT offers free undergraduate level electronics course

    Go here. They reckon it will take up about 10 hours per week and it runs from March until June. From their web site: It has some prerequisites: Looks like it could be a lot of fun. Naturally, anyone doing this course should NOT expect to find any easy answers in our homework help area...
  15. (*steve*)

    U-RAM CHOE

    If you get the opportunity to see one of his exhibitions, take it! A magnificent combination of engineering, electronics and sculpture.
  16. (*steve*)

    Datasheet required for KA20885D

    Another item from my box of unidentified parts. :) I've searched everywhere I know and I've come up almost blank. The only (partial) success was one of those sites which offer to sell you the part... Where the device was correctly identified as a DIP-30 (about 1.7mm pitch) device, however...
  17. (*steve*)

    Identifying a couple of components

    (1) The first one is a mosfet. It is in a TO-252 package. It appears to be an N channel mosfet. The markings on the case are: 12N6LE 95 09 *H C the * represents the logo of Harris (now Intersil) The closest part number I can find is RFD12N06RLE, which seems to fit. Does that seem right...
  18. (*steve*)

    PALs and GALs

    I've got a few chips that are described as being either PALs or GALs and I wonder what I can do with them. I realise they require programming. Is there something that teaches a beginner how to do this? I don't have any objective particularly in mind other than learning. I guess I also...
  19. (*steve*)

    PLEASE READ THIS

    PLEASE NOTE: Posts in this forum are automatically closed 90 days after the last post. The moderators may also close threads where it appears that the item is no longer available (or wanted). Maker Pro has strived to be as non-commercial as possible. Essentially that means to advertise, you...
  20. (*steve*)

    On semi part CQ873

    Proving hard to find. This is a plastic TO-220 labelled 2047 (ON) CQ843 Under that is a very small circle with the letters PHIL in the top half (radially from the centre) and J1 below them (horizontal) The device appears to behave like an NPN transistor with a gain of over 1000, with the...
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