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  1. K

    Creating my own high voltage divided diff amp. what resistance should I put in?

    I dont' recommend any circuits I know of. If your design is functional, it may be worth developing. There are many electronics products I have no experience with.
  2. K

    Creating my own high voltage divided diff amp. what resistance should I put in?

    Diff amps are still more like opamps. The instrumentation amplifier your designing is going to be inherently poor because the voltage is too high. The problem is that the ouput will be noise. Only a fragment of the signal will remain, but it may be useful.
  3. K

    project study topic suggestion for electrical engineering students

    Having been out of school for a while, the text books are probably leaning towards more contemporary ideas than they used to. But the electronics industry has been growing massively. Just about anything your interested in is worth the study. Communications is popular, but it's diverse and is on...
  4. K

    0-30 Vdc Stabilized Power Supply

    The PCB consruction for both high frequency and low frequency circuits is more complicated than that of the average use for this power supply. I would say to use a simple solder and wire circuit. Most often the problems will be the rest of the circuit. If you can fabricate a PCB, use larger...
  5. K

    need help 3 phase inverter (URGENT)

    I don't know of any inverters that can power 220V motors. A 110V inverter is useful for powering small appliances from a battery, but it is better to purchase one because of the complexity of their design. If you can't get the motor to turn, either the motor voltage or the frequency is too low.
  6. K

    Circuit help

    Since the device has the capability to operate the LCD, a digital computer based setup seems the most reasonable idea. Since the numbers peak over a small range, you might determine the binary sequence in this range.
  7. K

    Circuit help

    A digital circuit to store the highest LCD value might be what you want.
  8. K

    Automated Volage Slector

    The serial port is often used for downloading data to devices. A demutiplexar can convert serial data into parallel data output. A DC to AC converter is probably the simplest solution for a voltage selector.
  9. K

    High Voltage low amperage

    Generating a very high voltage with a small battery is an interesting idea. In theory, a transformer can produce any voltage, depending on it's turn ratio. They can also be cascaded. Are there any designs that utilize cascaded transformers, and if so, why isn't one transformer used?
  10. K

    magnetic motors

    What advantages do permanent magnet motors have over electormagnetic motors? In low power applications, a permanent magnet can be used, but for what purpose? They are always reliable by their design. Does it make them power efficient?
  11. K

    power problem

    IC's which utilize dual polarity supply voltages are intended to ouput positive and negative voltage. The IC supply voltage must be connected to the rest of your circuit power. Since these IC's utilize ground in most cases, additional circuitry would be needed. It's not simple and it is...
  12. K

    bench power supply

    The designs for a single polarity and dual polarity supply are basically the same. The rectifiers are opposite in polarity and the voltage regulators are different. The electrolytic capacitors must have the right polarity.
  13. K

    Common Emitter Audio Amplifier Question

    The circuit is a basic amplifier. It may not produce the desired result, unless it engineered to the specification of the MP3 player. The gain looks very low. The capacitors are the wrong value and it may need inductors or additional circuitry for linear amplification.   
  14. K

    How to amplify a square wave cheaply at 100 Hz?

    A voltage multiplier developes a DC voltage from the positive or negative cycle. The input is capacitvely coupled and the sinewave has this DC offset. A squarewave cannot be coupled with a capacitor, so the output is this DC offset when not in transition.
  15. K

    How to amplify a square wave cheaply at 100 Hz?

    A voltage multiplier might be a consideration. A very simple peak detector in series with a resistor and capacitor load on the piezo could supply adequate squarewave voltage. The parallel RC will be designed for the frequency of 100Hz or lower.
  16. K

    Impedance relation between 2 Bjts

    It's more of a dc electronics circuit. The leveling frequency changes the properties of circuit interconnection and impedance.
  17. K

    ~fF Capacitance measurement with mTouch 16f707 touch button!

    The accurancy of capacitance measurement doesn't seem possible with this circuitry. Digital electronics occupy a large  frequency spectrum. If this is a dedicated measurement microcontroller, what is the engineering addition difference.
  18. K

    LC and Oscillators

    Another aspect with these oscillators is the series capacitor inductor in parallel with the inductor. Not being a parallel LC means that the resonant frequency is not 1/(2pi x sqrt LC). The capacitive reactance does not equal the inductive reactance as it does in a resonant parallel LC. However...
  19. K

    Why prefer to use the center tap???

    Transformer's can be used in frequency resonant ciruits to allow for feedback. Their even ratio might be beneficial to the equation of oscillation, and there is no power consumption .
  20. K

    LC and Oscillators

    Walid,         A parallel LC filter circuit has a roll-off of 40db/decade outside the resonant frequency. An oscillator requires high gain, but it's selectivity can be independant of the gain circuit. The final design depends on the characteristics of the circuits and the components used.
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