Type: Posts; User: BradtheRad

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  1. Closed: Re: Symmetric Source + 10V and -10V - help me !!

    To hold to the purpose of the thread title...

    Here is a simple method to create split 10V supplies from a single 12V supply. Two loads, each 800mA.


    Notice the new supply outputs are...
  2. Closed: Re: "Current" controle is a big issue using ClassD ?

    Yes, my simulation illustrates the concept in a simple circuit.
    Adjust component values to yield your desired range of frequencies. Add a half-bridge if desired. Make the power supply single-ended...
  3. Replies

    Closed: Re: Bldc motor phase power calculation

    Do you wish to see if you can detect whether current is in phase with voltage? Do you wish to adjust component values so as to reduce power factor error?

    This requires that you compare voltage...
  4. Replies

    Closed: Re: Small Project archery aiming assist

    I recall from my boyhood it's difficult to hold aim and release the arrow on-axis. Our tendency is to jerk the bow or the arrow at the moment of release, ruining our aim.

    This is a simple delay...
  5. Replies

    Closed: Re: [HFSS] What does N/A mean for delta S?

    'Not applicable' =usual meaning.
  6. Closed: Re: How power is conserved using tapped capacitor circuit ??

    There is the concept of two capacitors creating a capacitive transformer. Could that be the principle at work here? It would be easier to grasp the explanation if we could see working schematics,...
  7. Closed: Re: Capacitive Boost or Charge-Pump DC-DC Converter

    While I'm inexperienced at IC fabrication, it's obvious there are hurdles because your transistors need to turn on with a small supply voltage.
  8. Replies

    Closed: Re: reason for 50 Hz ac current

    Here in the US we have 60 Hz. It's easier to calculate and build gear mechanisms to drive clocks (60 seconds per minute, 60 minutes per hour, 12 hours on a clock face). 60 is evenly divisible into...
  9. Replies

    Closed: Re: current-mode boost converter UC3845

    I adjusted for a slower frequency, in order to bring out the appearance of ramping waveforms, and to help emphasize the massive Ampere levels.

    60 kHz operation may very well be correct, however...
  10. Replies

    Closed: Re: current-mode boost converter UC3845

    Simulation of simple boost converter with your spec supply and output, showing expected waveforms.


    Notice the peak Ampere levels needed to produce 12A at 36V output. Obviously it's much...
  11. Replies

    Closed: Re: 0.5w audio amplifier

    I suspect the big hurdle is to switch electronically between one signal and the other. I once tried to devise a method using diodes and transistors, to admit one signal and stop the other. I gave up...
  12. Replies

    Closed: Re: Reference for VCO and PLL

    A handy source comes from short wave stations which broadcast time beeps every second.
  13. Closed: Re: How to provide Current feedback connection cadence virtuoso

    This sounds like a role for the Norton op amp (3900 is a common type). It's associated with current-differencing applications.
  14. Closed: Re: "Current" controle is a big issue using ClassD ?

    Simple class D amplifier made from 555 timer IC. Apply audio signal to pin 5. Varying voltage at pin 5 alters duty cycle.
    Incoming signal needs to be shifted to positive polarity.


  15. Closed: Re: Phase and attenuation constant 1-D periodic structure using CST or HFSS

    Below is your zip file reworked so it contains only your cst project (94 KB). Post #1 still has the link to the research paper.
  16. Closed: Re: Phase and attenuation constant 1-D periodic structure using CST or HFSS

    Please convert your project files to a zip file. Upload as an Edaboard attachment.
    That is preferable to making readers click multiple times to view all items at your link.
  17. Closed: Re: Regarding Electronics Enclosure Design - Tactile Button and Optical Sensor Tips


    It is easier to drill holes in the enclosure, than to ream a rectangular opening. Consider drilling a few holes for the light sensor, then insert translucent plastic plugs (example,...
  18. Closed: Re: Need a Paper: Electronic Circuit Diagnosis with No Data

    Forum rules do not allow copyrighted materials to be shared (or requested for sharing). If they're not easily and freely available, we assume that the author intends to charge a fee, license,...
  19. Replies

    Closed: Re: Buck converter vs buck-boost converter

    Comparison of buck versus buck-boost. Identical component values.
    DCM operation. Duty cycles adjusted to obtain similar output voltages.


    Buck type needs longer duty cycle.
  20. Replies

    Closed: Re: Ultrasonic transducer driver

    A Colpitts (or Clapp, its cousin) oscillator requires many adjustments of values, to get 1.7 MHz. Then to get oscillations started and sustained also requires a lot of adjusting. These produce a...
  21. Closed: Re: current mirror typical variation with load

    Suppose that gain of the transistor in your first column is 100. Try setting a gain of 110 in the second column (reasonable values in real life). Does this cause unacceptable mismatch of 'On'...
  22. Closed: Re: Capacitive Boost or Charge-Pump DC-DC Converter

    It's hard to be certain exactly who originated this charge pump topology (whether Dickson or Nakagome). To make some progress in this discussion here is my basic simulation showing how to connect...
  23. Replies

    Closed: Re: Just want to say Hi!

    These days members have a variety of mobile devices to write their posts.
    * Tiny keyboards
    * Touch screen keyboards
    * Voice recognition, etc.
    All are prone to spelling errors.

    In addition,...
  24. Closed: Re: Capacitive Boost or Charge-Pump DC-DC Converter

    Then do you have a schematic to start from, which uses mosfets?

    What is your power source? This creates a challenge for your project, because if you want 3V @ 400mW output, it requires a draw...
  25. Closed: Re: Capacitive Boost or Charge-Pump DC-DC Converter

    Diagrams of the Dickson frequently have two clocks driving it. These are in fact a full H-bridge which turns the DC supply into AC applied to the network. The circuit becomes similar to a half-wave...
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