Type: Posts; User: BradtheRad

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  1. Closed: Re: Gas flow meter + Gas pressure meter + Vacuum meter?

    Pressure of 1 kPa barely moves the needle on an everyday automotive vacuum gauge. This low pressure might be detected by the depth of liquid a hose is immersed and still allow gas to flow. The liquid...
  2. Replies

    Closed: Re: Filter topology anyone knows

    It looks as though mains AC comes in at left. And I think it filters power to an appliance at right. I'm reminded of a store-bought 'noise filter' which I took apart. It claimed to improve radio and...
  3. Closed: Re: Different current measurmen numbers on a FLUKE 289

    My meters are the same. Each mA range contains a different shunt resistance.

    When current level is unknown I start with the highest mA range to take a reading. If the meter moves a tiny distance...
  4. Closed: Re: Laptop RAM upgrade (new RAM doesn't work in RVS slot, but works in STD slot)

    Quickly after you turn on the computer you should see a notice to press F2 (or F10 or 'delete' or some other key or combination of keys) to enter the BIOS listing. If you press the correct key soon...
  5. Closed: Re: how to generate 4MHz clock from 2 MHz clock.

    This simple frequency doubler turns up via internet search. XOR (exclusive-OR) gate turns on at upward and downward transitions. RC values are not critical.

  6. Replies

    Closed: Re: Problem with the output of the switch

    I suspect the output ought to have some amount of resistive load on it, to allow charging and discharging in the capacitors.
  7. Closed: Re: How to analysis the loading effect of this kind of circuit?

    The 150 ohm resistance is always in the path between the op amps, thus it is the ohmic portion of the load.

    As for capacitors, they present zero resistance for a brief time after a change in...
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    [PIC]Closed: Re: PIC Program for Multilevel Inverter

    Your timing scheme has 14 steps. Create 7 arrays named SW1(), SW2(), etc.
    In each array create 14 elements which contain the successive state (0 or 1) of that switch.

    Go through a for-next loop...
  9. [SOLVED]Closed: Re: Ultra low-power timer to make a power saving circuit

    A store-bought appliance timer could be adapted to suit your purpose.

    To build your own long-period timing circuit there is the 4060 IC (or its cousin 4040 or 4020). It consists of a series of...
  10. Closed: Re: Power Supply Design for timer application

    There is the optoisolator (optocoupler) method for monitoring voltage. Create expanded scale readings by installing a zener diode inline.

  11. Closed: Re: Basic 12v Battery VOLTAGE METER, more resolution needed

    Congratulations on getting your project to work. Since you're in bargraph mode there can be 1/2 or 1 watt going through the safety resistor. That is so warm you can't hold it between your fingers.
  12. Closed: Re: Glow LED on specified counter values 0-500 in 89c52 uC

    It looks as though you light led1 every 15 counts starting at 10.
    Likewise led2 lights every 15 counts starting at 15.

    This can be done by a simple formula, for each led.
  13. Replies

    Closed: Re: Bias current sensor for floating earth

    1) File type .asc needs to be changed to .txt

    2) It can then be uploaded with your post

    3) Advise readers your file is LTSpice simulation netlist, and they must change file type back to .asc
  14. Closed: Re: Laptop RAM upgrade (new RAM doesn't work in RVS slot, but works in STD slot)

    There are limits of maximum RAM which can be recognized, depending on your hardware and your version of Windows. Sometimes you can change it in the BIOS options, or by running MSCONFIG.
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    Closed: Re: Vicor Bus Converter module

    It's a good idea to anticipate that one power supply will conk out for whatever reason. Immediately a group of propellers loses power. What the craft does next depends on the arrangement of motors:
  16. Closed: Re: 3-phase Δ-connected 11kV Open Circuit Fault Detection?

    1 VAC peak is able to light an led, by sending it through a single Villard cell (or voltage multiplier). The diode should be low barrier type (0.3 V forward). The capacitor acquires DC charge less...
  17. Closed: Re: 3-phase Δ-connected 11kV Open Circuit Fault Detection?

    Somewhere in the current loop you should be able to measure a resistance sufficient to develop 2V or so. Enough to drive a red led (a cheap method).

    Such a resistance might be present across the...
  18. Closed: Re: Old capacitor needs replacing not sure what to replace with.

    The casing has a schematic of 3 capacitors with internal connections:
    0.1 uF

    25 VAC Wkg means it was made to endure 25VAC working voltage. It's paper type. Non-polarized.

  19. Replies

    Closed: Re: Who has experience using tube...

    Not sure if you're asking about amplifiers or just pre-amps...
    I've had tube audio equipment. Tubes are prone to decline in performance with age and use. If a tube gave me doubts there was a tester...
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    Closed: Re: Any good earbud design?

    Your query is general and open-ended... Since you posted in the Network section, shall we assume you're interested in wireless earbuds? Bluetooth, etc.?
  21. [SOLVED]Closed: Re: What is a roughly realistic ambient temperature speed of fluctuation?

    * When I grip a component (temp sensor, diode, transistor) between my fingers, it shows a change after one or two seconds. Then it takes several seconds to reach a stable reading. When I release the...
  22. Closed: Re: Step Down Voltage Circuit at High Frequency (MHz)

    My simulation portrays a concept although it may require changes to adapt it to your project. Example, I don't know whether every zener is able to respond properly to 13 MHz.
  23. Closed: Re: Step Down Voltage Circuit at High Frequency (MHz)

    An expanded scale meter is handy to help achieve this. It does not start to read upscale until the source reaches a threshold voltage. Install a zener diode inline with your source. Thus an 80V zener...
  24. Closed: Re: Audio split: Analog vs. digital solutions

    When a signal is weak it's common to feed it immediately into a pre-amplifier. Then you have line level, normally 1/2 to 2V amplitude. It's less easily drowned out by noise, hum, clicks, etc.

  25. Replies

    Closed: Re: RF Switching with DC Pass

    Simulation, switching an AC signal by turning on a diode to conduct it.

    By itself the audio signal cannot pass through the diode, until mixed with a control voltage of sufficient level to...
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