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Type: Posts; User: BradtheRad

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  1. Closed: Re: USB PD Lab Power Supply, flyback- vs forward-converter, pro's vs con's?

    Weigh the risk if you attach homebrew circuits to your computer's USB port. You could ruin it. Switched-coil supplies are the type that ought to have a snubber, due to indcutive spikes.

    Another...
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    Closed: Re: Portable headphone amp w. batteries

    Example, how a 555 IC can be made into a simple class D amplifier. The 555 is configured as a pulse generator. Audio is fed to the 'CTL' pin, creating pulses of varying duty cycle.

    The earphone...
  3. Closed: Re: CRO measurements whether to ground or not and when to ground

    The scope doesn't absolutely need a soil connection. Nor your DUT. In fact a good thing to install is an isolation transformer. It insulates the scope from soil.

    There are situations where mains...
  4. Closed: Re: Phase Difference calculation in cadence.

    For waveforms A & B, create a zero-crossing detector (of upward-going transition).

    1) Test begins when waveform A crosses zero. Set timepoint=0.
    2) Wait until waveform B crosses zero. Detect...
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    Closed: Re: Discrete Transistor Design Work

    Transistors were featured in project books during the 1950's to the 1970's. (After the vacuum tube era and prior to the IC era.) Toss in magazine articles and the ARRL handbook. Articles explained...
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    Closed: Re: SMPS transformer design problem

    Does the Proteus installation include a library of sample circuits?

    Did you find an example file of the type of smps you wish to build?

    It should be feasible for you to modify its components...
  7. Closed: Re: My 12V DC Vending Machine motor rotates 1 extra 360 degree rotation sometimes.

    Your Google.drive links do not play a video. Instead they require permission which I was unable to obtain.
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    Closed: Re: Single conductor inside hollow conductor

    To pull wire through a tube, first use a vacuum cleaner to s-u-c-k a string through the tube. (It works quickly whether the tube is coiled or straight.) Tie the wire to the string, then pull on the...
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    Closed: Re: Discrete Transistor Design Work

    Your schematic appears to be in a textbook. Does it have a step-by-step tutorial? Starting with the laser diode and its specs. Then adding the driving transistor and control clock. Then adding the...
  10. Closed: Re: Operational amplifier driving capability test

    I attached a 1k resistor load on a 741 op amp. Specs say max output current is 10-25 mA.
    I was surprised to see output voltage drop 5 percent. Current draw wasn't near 10 mA.

    However it makes...
  11. Closed: Re: In-ear speaker transducers for hearing aids...

    I've disassembled ancient white plastic earphones (the kind we plugged into tinny transistor radios in the 1960's). It's a coil of wire beside a thin metal plate, held by adhesive or double-sided...
  12. 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...
  13. 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...
  14. 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...
  15. 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....
  16. 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...
  17. 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,...
  18. 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.
  19. 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...
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    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...
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    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...
  22. 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...
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    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.
  24. 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...
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    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...
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