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  1. elecmec

    Heavy Duty PC Board parameters, supply sources?

    jmc900: Check the Digi-Key catolog or web site. They carry Injectoral products, with small quantities of 1/2, 1, 2 and 4 ounce copper. I have seen thicker weights, but are usually special order, and with minimum quantities. You could plate additional copper on the surface to any practical...
  2. elecmec

    Career/Education Choice

    A working person persuing a degree must consider his options. Are you satisfied with your company, and do you want to find a better position with that company. If this is you goal, check with you HR group, if the IE degree will get you where you want to go. If your company pays for your...
  3. elecmec

    Will any OEM's test motors bolted down?

    Vibration is a result of out of balance conditons. If the rotor is well balance, the vibration should be low. I once inspected motor generators (150HP) and our spec required a measurement in mil's of the vibraion in the x and y direction for each bearing. The set was mounted on a platform...
  4. elecmec

    PCB Circuit Repair Methods

    Try: www.circuitnet.com They have a news letter which can provide information on the inductry plus tips on the latest package and circuit repairs. Elecmec
  5. elecmec

    DC/DC Totaly Isolated converter

    I am not familiar with the MAX845, but after checking the data sheet, you could use dual MAX845 circuits, or use drive transistors between the IC and the Transformer, to boost the output. Dual or single ended will work. Elecmec
  6. elecmec

    General Circuit Troubleshooting

    Some of these questions bring back memories. The HV Anode charges a capacitor which is made from a conductive coating inside and outside of the glass picture tube. If you discharge the capacitor, and wait several minutes, you will see voltage on the connections. Some charge remains in the...
  7. elecmec

    hi-pot testing versus megger insulation testing

    mriechert: The hipot test is a subjective test, which as a rule of thumb, applies 1000 volts plus two time the maximum circuit voltage, to all the elements of the circuit with respect to the chassis. When solid state devices are used, they are usually wired together for protection. This...
  8. elecmec

    transistor equals temperature

    xray: A silcon junction as the base to emitter in a bipolar transistor is a good choice as a temperature sense element. It has good liniarity from -55 to about +150C. With a current of about 1 mA, it changes about 2.2 mV per deg C, with the voltage drop decreasing as temperature increases...
  9. elecmec

    Circuit for electromagnet

    Neiltowers: There is not much electronics involved in building an elecromagnet. An electromagnet has a soft iron core, usualy a large nail or bolt, around which wire is wound. The wire, usually solid enamel coated (magnet wire) wound on one direction around the iron core. Wire has a finte...
  10. elecmec

    Information about induction cook

    halgos: Information on induction cooking can been found in applications sections of SCR, Triac and more recently in IGBT manuals. The system relies on a metalic cooking vessel, where eddy current inducted by an induction coil at some frequency (KHZ) cause heating. The vessel can be thought of...
  11. elecmec

    PULSE AND BLOOD PRESSURE DETECTOR

    jitendragorashia: Many blood pressure sensor have an IR source and detector. By passing the IR through the finger, the detector will be interrupted as a blood surge passes by. The surges are counted and displayed on a per minute rate. Elecmec
  12. elecmec

    Hold Time on Power Supply

    Unfortunately capacitors or batteries can only do the job.  Be careful with batteries, you will need control circuits.  If the problem was only in the RAM, the power supply could be isolated via a resistor, and a capacitor added at the RAM.  This would hold the RAM...
  13. elecmec

    Power consumption?

    I assume you mean a communications card in a PC.  Check the power consumed by the PC without the card installed, and again with the card installed.  If you use a watt meter, don't forget the PF.
  14. elecmec

    PWM INVERTER WITH IGBT TRANSISTORS

    Check the intersil.com site.  The inventor of the IGBT have devices that, use in a syncronous mode can do 200Khz or more.  Product is available in standard packages for conventional mounting.  Heat sink will depend on power loss in device, both switching loss and...
  15. elecmec

    Solid State device to replace a spark gap

    What is the energy level that must be discharged?  Most solid state devices would be impractical unless specifically designed for the application.  In the past, vacuum tubes could be applied, as in some radar components.  Perhaps some piezo device can convert the...

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