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  • Users: salec
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  1. salec

    Easy blinking LED circuit help please

    You need to combine two timer circuits: an astable for blinking rate, and a monostable for brightnes/steadiness. Astable should trigger the (retrigerable) monostable. Monostable should light LED. By varying the frequency of astable, you adjust the blinking rate. If you adjust it very high, so...
  2. salec

    Solar Cells + Volatge

    It just struck me when I read electricuwe's post: Maybe a tunnel-diode oscilator would be appropriate for that, as it normally works only at small voltage supplies? Search the web for "tunnel diode oscillator".
  3. salec

    PCB Manufacturers???

    I agree with Lewish. There are good manufacturers in Bulgaria, as well as in Macedonia and Serbia, but if you are in North America, check Mexico (don't burn cerosine if you can use surface delivery ;-) ): http://www.crito.uci.edu/git/publications/git-mex-rpt.html http://www.world2mex.com/...
  4. salec

    Advice on selecting automotive grade components

    True, it does have over & under voltage and thermal shut down. Never occured to me as a problem, but I suppose your solenoid must hold, no matter what happens to car electric supply rail. I used it only to switch incadescent light, which is surely not a critical application. In my design it...
  5. salec

    Advice on selecting automotive grade components

    Instead of p-MOSFETS, you may want to try automotive high-side switch? It comes all-secured, with logic level command input and with error status output, so you can provide failure indication. I have used Infineon devices, but there are others', to.
  6. salec

    Transformers in parallel: What are the pitfalls?

    I agree with JMarko, and you can even get by with just one Graetz and two diodes: The Graetz is applied on one of the secondaries. Two remaining secondaries are to be tied in series to form a-sort-of one secondary with middle out (observe the winding directions). The middle gets tied...
  7. salec

    UV Exposure Units

    To nbucska: Actually, I don't. I just break outer glass bulb and expose inside tube which emits UV-only. I have heard that fluorescent rods (and complete bulbs) actually emit not only visible but also a portion of UV light, but I have no way to examine that. Do you know an inexpensive way to...
  8. salec

    UV Exposure Units

    I didn't actually did this, but several friends of mine did: Buy a plain white-light fluorescent "bulb" (i.e. Phillips), a starter and appropriate ballast choke (will depend on bulb nominal power consumption). Wire the ballast, starter and bulb socket of some desk lamp you have (the...
  9. salec

    Programmable sine wave

    I needed it too, and couldn't find it. There is no drop-in replacement, but Fairchild still makes similar ML2035 and ML2036. Check: http://www.fairchildsemi.com/pf/ML/ML2035.html and http://www.fairchildsemi.com/pf/ML/ML2036.html
  10. salec

    Remote a std 3.5" 1.44MB flpy dsk drv

    KISS: Distance and speed are within the reach of RS422/RS485 links. If you do a little R&D after all and make a pair of interface boxes to convert signals (that is fairly simple, using two (1 Rx, 1 Tx) cheapo 5 Volt ICs per four signal lines per direction) that run to and from the floppy...
  11. salec

    Sine wave generator

    Fairchid Semiconductor

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