Type: Posts; User: BradtheRad

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  1. Closed: Re: Level Shifters: Trends in Delay and Transition Time

    In all probability you apply the higher voltage through one device, and the lesser voltage through a different device. This occurs internally in an op amp which is a common level shifting device. Is...
  2. Closed: Re: Extracting energy from gyroscope precession

    This jogs my memory about a mystifying physics demonstration. Sit on a free-turning chair, feet off the floor. Start a bicycle wheel spinning with your hand. It becomes a gyroscope. By orienting it...
  3. Closed: Re: What is the conditions for complementary BJTs

    Gain and power rating are probably chief parameters to match, especially if you wish to push your amplifier to its maximum performance. Also the maximum amount of bias current they can tolerate...
  4. Closed: Re: li-ion voltage reducer to 3volt - help needed

    My wireless mouse takes 3V @ 10mA. I made a battery pack from 2 half-used D cells. 2.5V is sufficient to operate the mouse.

    If your setup is similar then I think a plain zener diode does the job....
  5. Closed: Re: PS with LM76003 for variable volatage and variable current design?

    When you draw high power your output capacitors have to carry 1 or 2 Amperes per cycle. That's thousands of times per second. It may be all right to have a gang of several surface mount capacitors as...
  6. Closed: Re: How to calculate bandwidth for this circuit, including lower and higher cut off f

    Yes, there are schematics on the internet which resemble your circuits. My observations are general since I'm not familiar with their operation.

    Wherever your circuit has a series LC or tank LC,...
  7. Closed: Re: FYP ideas suggestion on FPGA, or FPGA based network processing/network on chip

    I guess this is asking for ideas about a Final Year Project title?

    Try a forum search on your words of interest.

    Also click on related threads in the list further down this column.
  8. Closed: Re: How to calculate bandwidth for this circuit, including lower and higher cut off f

    Your schematics have a number of LC loops, and capacitors which can be switched in and out of the network. It looks as though components are able to resonate, and interact unpredictably, with other...
  9. Replies

    Closed: Re: analog pressure gauge to 4 to 20mA

    A lot depends on the travel distance of the pointer.

    By mounting a tiny strong magnet on it, its position may be detected by a hall sensor. To get linear response needs lots of experimentation and...
  10. Replies

    Closed: Re: H bridge with IR2110

    Your schematic has at least one inductor in the current path. An inductor tends to generate current during dead time. It could affect V-versus-A phasing.

    Abrupt shut-off of an inductor often...
  11. Closed: Re: Calculate the load capacitance in oscillators

    Each logic gate has some resistance in its output stage. This means it can provide (source) limited amount of current to the load. Your capacitor load tries to draw maximum current for the time it...
  12. Replies

    Closed: Re: What Signal is this?

    Yes, you can send the upper waveform through a simple RC or LR circuit, as a low-pass filter, to get the circled waveform.
  13. Closed: Re: 3 phase 4 wire(480V) AC to 12VDC (100mA) power supply for energy metering applica

    Is your meter portable? Can it run on a 9V battery? Or several rechargeables?

    Is your meter installed permanently? Can you power it from a wall receptacle?

    It sounds like unnecessary trouble...
  14. Replies

    Closed: Re: Charge pump topology

    This voltage multiplier is a Nakagome type. Capacitors charge in parallel, discharge in series.

    Additional stages can be added until output is 3.3 V to your load. This schematic is a tripler, to...
  15. Closed: Re: Homemade music lighting system with controller board(s)

    A bargraph can also be made from op amps arranged as a window comparator. The more led's in your display, the more impact it has.

    For the fun of experimentation this simulation has 12 led's,...
  16. Closed: Re: Homemade music lighting system with controller board(s)

    You may be familiar with the 3914 IC (dot/bar display driver). Ten output pins activate ten led's (or ten transistors which each control a high current led).
    3915 has logarithmic response, to...
  17. Closed: Re: [moved] Switch mode power supply interview question and response...bluffing?

    It could be that his strategy in conducting an interview, is to find out whether he'll get the most valuable input you can give to future projects in the company. Thus he might present an idea which...
  18. Replies

    Closed: Re: Charge pump topology

    It's a challenge since you want to build an oscillating circuit which avoids the use of diodes because they subtract from output voltage.

    This simulation is a voltage doubler which works with...
  19. Closed: Re: Extracting energy from gyroscope precession

    I believe you refer to this thread?

    A reply to that thread won't go through because the system routinely closes threads after six...
  20. [SOLVED]Closed: Re: Is ADS 2009 netlist simulation from command line impossible compared to ADS 2014?

    Your Attachment 155281 expired (possible reason, too long delay while composing post). Try uploading image again, and submit new post immediately.
  21. Replies

    Closed: Re: Variable gain amplifier

    A light-dependent resistor (usually Cadmium-sulfide cell) is an option.

    A jfet varies its gain as you vary bias voltage. These are less readily available than they used to be.

    Also consider a...
  22. Replies

    [SOLVED]Closed: Re: DC-DC converter to -3.3v

    Charge pump configured to invert polarity. Notice your 5V supply must provide several Amperes, if you wish to attach a 2A load.


    Although diodes make for easier construction, they...
  23. Replies

    Closed: Re: "Closed" thread

    I have not seen unusual 'closed' messages.
  24. Replies

    Closed: Re: Lowcost Voltage Controled Oscillator?

    Do you prefer a sine wave generator?
    For the GHz range I suppose you need the fewest components, and fastest components.

    The twin-T is feasible. It has only one transistor. Its frequency can be...
  25. Closed: Re: Zero crossing detecting formula 3 phase network

    A pair of anti-parallel led's makes a handy method to indicate volt level and polarity. Or optoisolators.

    Another pair of led's (optoisolators) can indicate current, if it's low enough to be safe...
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