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  • Welcome to our site! Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.

Recent content by RussMartin

  1. RussMartin

    I need help with soldering; tips quickly wearing out

    In the words of an on-the-air fumble by John Cameron Swayze in the early days of live television advertisements: "Remember, with Timex, you get what you pay for; and you don't pay very much." When one buys cheap tools, he gets exactly what he pays for. I've been using Ungar and then...
  2. RussMartin

    need to cross a SGS28544 to ECG

    If it is a power NPN simply being used in a switching capacity, there are probably a large number of substitution possibilities. From where are you getting the part number--the device itself or the Coleman parts list?
  3. RussMartin

    Software for designing flowcharts

    Even better: Comments so well-written that, if you get hit by a truck tomorrow, someone else, six months from now, can completely understand what you've done, and how. ;) When I was a college undergraduate, there were no Comp Sci courses. There were exactly two one-semester courses in...
  4. RussMartin

    Software for designing flowcharts

    This probably dates me . . . When I was learning to program in the mid- to late-1960s, I was taught to flowchart first as a way to define the specific approach I was going to use. I still do this, with pencil and clear plastic template. (I have several; two of them are so old they say...
  5. RussMartin

    Help with a Triac circuit please

    U2008b It is intended primarily as an AC motor control device. I've worked with it in some other applications. It is the successor to the obsolete TEA1007 and also to the U208B. A few years ago I saw a circuit using the TEA1007 in a do-it-yourself EasyWelder, but I can no longer find the...
  6. RussMartin

    Can't decide what programmer to buy

    Good points. The U2 runs under MicroCode Studio. Perhaps a better choice would be the PICkit2 bundle from Microchip. It's a lot less expensive, too, at $49.99: https://www.electro-tech-online.com/custompdfs/2008/08/51570a.pdf I've not used the PICkit products but I've heard good...
  7. RussMartin

    lm7805 capacitors!!

    The input capacitor is recommended if the regulator is more than a couple of inches away from the filter in the DC power source. This capacitor helps get rid of noise "riding" on the DC input. The output capacitor helps minimize transients and high frequency noise on the output from the...
  8. RussMartin

    Can't decide what programmer to buy

    Or you can buy the U2 programmer with accessories, including the adapter, the USB cable, and the software: https://www.melabs.com/products/usbprog.htm The programming cables with 10-pin headers are extra; they're shown at the bottom of the page. Jeff and Charles at mE Labs provide great...
  9. RussMartin

    Can't decide what programmer to buy

    I recommend buying your programmer assembled. That way: 1. You know it works, and 2. You can devote your energy to breadboarding and soldering your projects.
  10. RussMartin

    Help with a Triac circuit please

    Perhaps a different approach could be had by using the Atmel U2008B: https://www.electro-tech-online.com/custompdfs/2008/08/doc4712.pdf
  11. RussMartin

    Photo optic event counter needed

    Just curious: What/where in St. Louis is the place where this would be? I remember visiting a really fine children's science museum there about 25 years ago. Obviously, there are many ways to accomplish what you are asking about, beginning with cascaded decade counters and going up all...
  12. RussMartin

    Can't decide what programmer to buy

    You also may wish to explore the options offered by microEngineering Labs: https://www.melabs.com/ The U2 programmer is quite good, as are their other products. If you are new to programming as well, they offer some good resources. You can also look at...
  13. RussMartin

    Anyone intersted in designing a circuit for a project of mine?

    I might be able to help you out, but I'd certainly need more information on your application. Russ
  14. RussMartin

    Wanted: Service manual Beckman 9204

    I'm looking for the service manual for a Beckman Industrial 9204 40MHz oscilloscope. Any information or suggestions will be appreciated. Russ
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