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allvol

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Everything posted by allvol

  1. Oops! I did err by flipping the two. My bad! That's why the board needs experts to keep us straight. Thanks.
  2. Aluminum foil, wadded tightly and crammed into your car's exhaust tailpipe, will eliminate their being able to follow your automobile's movements.
  3. 200n is 200 nanofarad. Caps are general valued in microfarad (uF) for the largest through picofarad (pF) to nanofarad (nF) The voltage of a cap is the largest voltage the cap is capable of carrying. Think of caps in circuit as small batteries that charge up to the voltage in the circuit, then release that voltage as the circuit demands (timing, etc.) I'm sure you know that caps will not directly pass DC current and are therefore used to block dc from certain parts of a circuit. Hope this helps.
  4. What are you using to pulse the 7490? You can manually count with a push-button wired bounceless, or you can use a 555 timer for continuous counting.
  5. Then check this out: http://justhandhelds.com/Merchant2/merchant.mv?Screen=PROD&Store_Code=001&Product_Code=10001&Category_Code=99-010
  6. Generally, the 555 timer IC is not used for long-duration time events, but is, as you say, useful for turning things off and on, and is also used to provide a fairly reliable clock pulse. Go to " 555 timer " on any search engine and you'll find all the information you need to use this little device.
  7. I had some good luck with recycled parts today. At what we call in the US a garage sale, I bought an old cassette tape Panasonic answering machine.
  8. Apparently, they aren't giving away samples now. I couldn't find anything, either.
  9. Really, all this is covered in depth in the 11 pages of Free sample chips! found at the top of this page.
  10. Be aware that many samples you receive these days will be in the SMD package... hard to work with unless you have magnified eyes and a steady hand - plus the special pads. AllVol
  11. I would suggest you not actually touch the sleeve with your soldering iron - merely get close enough for the radiated heat to reach the material. AllVol
  12. Excess-3 is a non weighted code used to express decimal numbers. The code derives its name from the fact that each binary code is the corresponding 8421 code plus 0011(3).
  13. Excess-3 is a non weighted code used to express decimal numbers. The code derives its name from the fact that each binary code is the corresponding 8421 code plus 0011(3).
  14. Having recently acquired a PIC development board that requires 16 v., I decided to build this LM317 PSU from the projects section of this board. It took less than two hours to construct, using junk box parts, (including the LM317 already on hand).
  15. Well, phooy. I guess I'll have to take these that are working on my bench and scrap them. AllVol
  16. Anton, Try this website:
  17. Hi, bmachine Using an LM7809 voltage regulator and two common capacitors will produce a steady 9 volts
  18. Thanks for helping Need find the solution to his problem. AllVol
  19. While you are waiting on Audioguru's answer, you might want to look at the attachment, which shows a transistor driving both a LED and a buzzer.
  20. Virus, Re: your reply #62 Could you be expecting too much?
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