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Recent content by 1/2dime

  1. 1

    lifetime of an offline psu

    Google "MTBF Calculation". Each part is rated differently (a carbon film resistor has a higher failure rate than a metal film, which has a higher failure rate than a wire-wound), failure rates are added up, averaged, multiplied, divided and guessed at. E
  2. 1

    Best elements for downhole and high temperature circuits

    If it is a one-off, why redesign the wheel? There are several manufacturers of deep-well probes. Do you have a basic design? What are the physical dimensions of the probe? Do you want to store the info in the probe or communicate real-time with the wellhead? How are you going to power the probe...
  3. 1

    Identify SMD SOT-23 part code

    The part given was for the OPs query. I hadn't looked at the post date! E
  4. 1

    Tracking device for Bikes

    Here in Vancouver, BC we have a "Bike-Bait" program, that tracks stolen bikes via GPS, so these devices are available. Go to Google, police, high-end bike shops for info? E
  5. 1

    Identify SMD SOT-23 part code

    Try BCX71G. E
  6. 1

    What would you call this LED type

    You did not give dimensions, colour, visible or IR. See Panasonic LN222RPH as an example. Available from Digikey. E
  7. 1

    PCB desgign compliant with Ex proof standards.

    I don't know what the thing with 3 diodes and resistors is about, but you might look at parts for stringent and/or military requirements. For example: WIMA capacitor series MKB and MIL spec connectors and enclosures. E
  8. 1

    technical knowledge improvement steps

    What level of knowledge do you consider you are at now and what area in electronics interests you? E
  9. 1

    how capacitor is used as a inductor

    Google "gyrator circuit" for full description and examples. E
  10. 1

    Need help with a white noise device

    What you seem to be looking for is a device that produces shaped noise similar to that used in sound masking systems in office buildings. The size you describe can be done, except for the power supply (or battery) and the loudspeaker. The sound is shaped electronically to correct for the room...
  11. 1

    Any idea about digital potentiometer

    Xicor and Dallas have digipots that are push-button controlled and do not need a micro. E
  12. 1

    Interview Question which is simple

    Where is the battery at that point? E
  13. 1

    Writing/Adding Ac Signal

    Carrier current transmission. Check out the National LM1893 and be aware of the safety issues dealing with the mains! E
  14. 1

    reliability of electronics equipments

    You leave this wide open! What type of reliability are you interested in? Parts? Mfg. QC? Maintenance & service? To name some areas of concern. Google MTBF (mean time before failure) to get a start. A lot of lengthy books on this subject are available! E
  15. 1

    Industrial temperature controller

    Are these numbers temperatures? F or C? 8000 is quite warm in either. What is the application: Body (contact) fluid (immersion) spectrometer or infrared? E
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