Search results

  1. I

    convert analog to digital

    Look up (google) ICL7106, ICL7116
  2. I

    Tank ckt

    At resonsance, the impedance approches infinity (this of course is impossible... there are always circuit paracitics). From the WWW... The solution to the circuit (which is a second order differential equation) is i(t) = Ae ^+ jωt + Be ^− jωt Considering the initial conditions, solve for A...
  3. I

    PWM filter... does it matter which cap?

    No... it doesn't matter, just beware of peak-charging.
  4. I

    Free to try Sound Card Oscilloscope, Spectrum Analyzer and Signal Generator

    The problem here is bandwidth... it's only as good a your sound card, and how high beyond 20KHz does it go.
  5. I

    Beginner's Question 2

    The term "ground" is often not used properly. You'll hear things like... connect it between +5V and ground... this is not correct, it should be connect it between +5V and 5V return. Power supplies are not referenced to ground, they are referenced to their return. Now it maybe that the return is...
  6. I

    LDO Loop Compensation (question)

    That is not a easy question to answer unless your familiar with... transfer functions, the complex frequency domain and what bode plots are, and what they tell you. The short answer is... the output capacitance and load resistor form a pole at a frequency of
  7. I

    free energy motor

    Unfortunatly the "twisted pair" concept (and it's benefits) have been around decades prior to the internet showing it's face. I doubt  the laws of physics have changed, but there just might be something there. Hey... as soon as you made the line "dedicated" you got bandwidth, but on the flip...
  8. I

    battery and HDD

    A 7812 can't supply anywhere near the amount of current that is needed to "spin-up" the drive, or when the head is seeking.
  9. I

    Not Gate

    What do you want to switch?
  10. I

    Whats a switching diode?

    It also relates to the reverse recovery time... in the case of a switching diode, Trr is "fast". Besides rectifier diodes, and general purpose diodes, there's the Schottky, no Trr, a lower forward voltage, but a much higher junction capacitance.
  11. I

    Basic Practical COncepts???

    You have to remember all wires and circuit traces have inductance ~20nH/inch. If you need to supply large amounts of current fast, the voltage will dip. Many components (active) can't tolerate dip's below certain levels, so a "local current source", in the form of a capacitor, is added. Pull-up...
  12. I

    mosfet transistors

    It depends on the topology that you are using... if the primary is push-pull, then the drain voltages on the MOSFET's will be 2x Vin plus any spikes from cross conduction or leakage inductance. How high these spike will be is hard to say, there are many factors to consider. The "clamp" that...
  13. I

    free energy motor

    I don't think the properties of copper wire have changed since 88, but what about the method by which the information is sent? I would have to think great strides have taken place in that arena over the past 20 years, no?
  14. I

    Tank ckt

    No... that waveform looks like a simple RC integrator. At resonance it would oscillate at 1/2*pi*(L*C)^.5
  15. I

    6V 5A PSU problem.

    Technically, all switch mode converters require a load (especially converters that run in the continuous conduction mode). Voltage mode converters are even worse in regards to min load levels because of the right halfplane zero in the transfer function. Specifically for a Cuk, I don't know...
  16. I

    6V 5A PSU problem.

    Check out a Cuk converter if you believe all switch mode power supplies have noise and ripple.
  17. I

    Tank ckt

    You neglected to explain about their impedance values at resonance... and what about "Q"??
  18. I

    Not Gate

    Think about the base/collector relationship in a NPN, common emitter configuration... 
  19. I

    Not Gate

    Do you mean an "inverter"??? H in L out and L in H out??
  20. I

    Need help saturating a transistor for 2 amps

    You could try using a low on resistance (.006 ohm) logic level MOSFET.
Top