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  1. circuit1952

    Book for AutoCAD beginner

    I have been given the task of updating some wiring diagrams in AutoCAD. I never used AutoCAD before. I have managed to copy and paste and move lines and symbols around, but I need recommendations for an introductory book about AutoCAD. I browsed the AutoCAD section at a local bookstore, but the...
  2. circuit1952

    How passive temperature sensors work ??

    The pull-up resistor limits the current flow through the sensor to limit the self-heating effect. The fixed resistor in series with the sensor forms a voltage divider. http://en.wikipedia.org/wiki/Thermistor http://www.thermometrics.com/htmldocs/whatis.htm...
  3. circuit1952

    6 channel signal Amp

    A precision resistor is inexpensive, compact and requires no power supply to convert a 4-20mA signal into a 1-5V or 2-10V signal. If the signal is shared by different devices, you may have ground loops or other interference. In that case, a signal condioner such as ScottyUK mentioned may be...
  4. circuit1952

    wiring diagrams

    What format are the diagrams in?
  5. circuit1952

    Relationship of Ambient Temp to Fuel Economy

    Did you run the heater/defroster in the winter? Are you using air conditioning now? Both can impact fuel economy. Did you pack more/heavier clothing for your winter trip? Look at http://www.fueleconomy.gov/feg/factors.shtml
  6. circuit1952

    Rusty thermocouple connector

    Will rust on a type J (Iron-Constantan) thermocouple affect the temperature measurement?
  7. circuit1952

    Must have tools for circuit testing bench

    Warpspeed, I've been tempted to spec a coffee mug holder on some equipment we've ordered!
  8. circuit1952

    Mimick the Physical Properties of Avaiation Fuel

    jdarcy, 1. Identical posts in different forums are frowned on. 2. You get a better response if you give more information in your question. 3. Read the FAQs. eg, faq731-376
  9. circuit1952

    DCS Delta V connect via Modbus Ethernet Modicon Premium PLCs

    daicly, I suggest that you start a new thread to ask your question instead of posting it on a thread that has been INACTIVE FOR TWO YEARS. See faq731-376
  10. circuit1952

    Receiver

    See faq731-376
  11. circuit1952

    Relay Suggestions

    Opto22 http://www.opto22.com/asset/documents/0859_Solid_State_Relays_data_sheet.pdf In general, when you want to know who makes something, try Thomas Register http://www.thomasnet.com See http://www.thomasnet.com/nsearch.html?cov=NA&what=Relays%3A+Solid+State&heading=67401406&navsec=prodsearch
  12. circuit1952

    Why are most hybrids based on gasoline engines?

    Earlier this year EPA and Eaton announced a demonstration project where they would outfit a UPS delivery truck with a hybrid powertrain that includes a clean diesel engine and hydraulics. See http://www.epa.gov/otaq/technology/420f05006.htm
  13. circuit1952

    EFI suppiles/parts

    Try these: MegaSquirt EFI: http://www.msefi.com/ DIY-EFI: http://www.diy-efi.org/ Eric Fahlgren's web sit: http://not2fast.wryday.com/ Searching keywords such as DIY (or do it yourself), EFI, injector driver circuit, etc. may yield others, but the 3 mentioned above are among the best for...
  14. circuit1952

    12V DC Speed Controller

    Chuff, Look at these: http://www.4qdtec.com/pwm-01.html http://www.solorb.com/elect/solarcirc/pwm1/...
  15. circuit1952

    conversion question

    BigTom2005 "if they can use voltages to convert to frequencies (Voltage controlled oscillators), then it makes sense that you can do the same with current." That does not mean there is any inherent relationship between the units being discussed. If you use a circuit to convert from current to...
  16. circuit1952

    V/I or I/V CONVERTER

    Logbook, 4mA X 250 ohms = 1 volt 20mA X 250 ohm = 5 volts Now to get 0-5 volts, first add -1 volts and then apply gain of 1.25. See Art of Electronics or any good op amp text.
  17. circuit1952

    V/I or I/V CONVERTER

    Hint: 250 ohm resistor.
  18. circuit1952

    energy required to produce 100W photovolatic panel

    It is said that electric vehicles just shift pollution from the car to the power plant. From this thread it seems that solar cells shift energy consumption to the fabrication facility. Both these statements ignore key facts. In the case of electric vehicles, you replace many mobile internal...
  19. circuit1952

    Air Fuel Meter w/ Bosch LSU4

    Take a look at this: http://www.megasquirt2.com/PWC/
  20. circuit1952

    [i][b]Hazardous Areas, & Terminal Blocks[/b][/i]

    A better place to post your question is the NFPA forum, forum184. Also, do a search on "intrinsically safe".

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