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Type: Posts; User: BradtheRad

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  1. Closed: Re: How to adapt (normally) PCI Express x1 to work in PCIe Mini Slot

    You probably know about installing drivers for new hardware, and looking at Device Manager to see if any device causes an alert.

    Several connectors, brass tabs sliding against brass plates, etc....
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    Closed: Re: matching network design question

    Some definite amount of ohmic resistance ought to be ahead of your filter. Looking closely, that appears to be a resistor just above the waveform generator at left. Is that your intention? Does the...
  3. Closed: Re: Help needed; Check of PCB and some other questions

    Then what you installed may be sufficient. The source of noise isn't much different from the buzzing that comes through an amplifier when the microphone lacks a ground connection. Inside is a...
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    Closed: Re: Colpitts oscillator stability analysis

    The hatched area is the region that generally works for low voltage, low current circuits (I think). The upper and lower limit are approximate (obere Grenze, untere Grenze).

    Usually you want an LC...
  5. Closed: Re: PAC and PSTB for switched capacitor integrator

    I think your schematic ought to include some amount of resistance at each incoming voltage. And for good measure put a resistance in series with capacitors. Otherwise the simulator is unable to...
  6. Closed: Re: Help needed; Check of PCB and some other questions

    It sounds as though you have 50kHz pulses running through tracks separated by 1 mm, for a few feet of length. There is a certain amount of inductance between the tracks. Have you tested that it...
  7. Closed: Re: Looking for an non-invasive sensor for a fitness machine

    I imagine there's a metal arm or pivot moving just inside the housing, which you could detect with a strong magnet. And the magnet may produce waveforms in a coil of wire placed next to it, or wound...
  8. Closed: Re: need translation from Chineese to English

    There are free translation websites.

    One method is to highlight the characters (by mousing through them), then copy and paste. (Example, translate.google.com)

    If it's an image then this can't...
  9. Closed: Re: Help needed; Check of PCB and some other questions

    I can see why all led's and sensors must point 90 degrees from two flat PCB's facing each other.

    The length of your narrow circuit board (1050 mm) converts to 3.44 feet. Do you intend to make it...
  10. Closed: Re: Help needed; Check of PCB and some other questions

    Your image is a long, thin pcb. Detail is visible by enlarging it.

    Did you intend for your sensor data sheet to be a duplicate of your pcb?

    Is each sensor supposed to detect light from a...
  11. [SOLVED]Closed: Re: Effect of LC filter in simulation of BTL H-Bridge inverter?

    The screenshots are Falstad's animated simulator. Free to download and use at (your computer needs to have Java installed):

    falstad.com/circuit

    This is how the waveforms are produced by 2 op...
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    Closed: Re: Colpitts oscillator stability analysis

    Yes, there it is, looking at the graph in the Elemente book link (looks like page 211).

    158375

    The graph relates frequency to Zo...
    and Zo is determined by the L:C ratio (or rather the square...
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    Closed: Re: Engineering in times of Covid-19

    Diluted hydrogen peroxide is germicidal and non-allergenic.

    There are claims that ultra-violet lamps disinfect surfaces. A review article is in the current newsletter from WTWH Media (associated...
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    Closed: Re: Colpitts oscillator stability analysis

    A high L:C ratio takes more cycles to grow to a steady state from power-up.
    It also rings for a longer time after shut-off.
    The reason is that it usually has higher Q and greater 'inertia'.

    When...
  15. [SOLVED]Closed: Re: Effect of LC filter in simulation of BTL H-Bridge inverter?

    Those capacitors to ground provide a direct path for damaging high current, if LC resonance was instigated by switching at certain frequencies.

    ---------------------------------------------
    ...
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    Closed: Re: how to make diy inverter

    Yes, if it's available. What is your power source? It may be easier to convert that. It's likely the laptop can operate on 19V... maybe even 18V or 17V.

    There's a hurdle in obtaining the right...
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    Closed: Re: BLDC motor regenerative breaking

    I guess the join node of your coils is ground? It would be best if your schematic includes a power source and wiring, as well as current return paths.
  18. Closed: Re: Non Overlapping Clock Generator(4 outputs with same frequencies as the input cloc

    A shift register provides non-overlapping pulses. It's made from D flip-flops (as you first mentioned). Classic digital logic. Works at any clock frequency. No capacitors.

    No time constant...
  19. Closed: Re: Where to get schematics about SCRs full-wave triggering circuits ?

    Correct. Lamp dimmers started early to be a common role for triacs decades ago. Where there was a diac, schematics often substituted a neon bulb. NE2/NE2H type were readily available at that time....
  20. Closed: Re: Where to get schematics about SCRs full-wave triggering circuits ?

    Since it's not easy to find thorough instructions about triggering SCR's, it implies they're not the easiest devices to work with. Each must be triggered individually in a circuit, and attention must...
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    Closed: Re: Speaker wattage not known

    To some extent you can gauge speaker quality by the size of the magnet. A small magnet (say 1.5 inch diameter.) suggests it's for low volume and low power.

    A large magnet (3 inch diam.) suggests...
  22. Closed: Re: Where to get schematics about SCRs full-wave triggering circuits ?

    Start with the simplest possible simulation to trigger an scr. Apply increasing voltage to the gate (referenced to ground). See what level of current triggers it to conduct.

    Try putting the load...
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    Closed: Re: capacitive touch sense switch

    I have touched my finger to the input pin of transistors or logic gates, and then saw 60 cycle pulses at the output. My body picks up mains hum (from everywhere in the room), and carries it to the...
  24. Closed: Re: Non Overlapping Clock Generator(4 outputs with same frequencies as the input cloc

    A chaser or sequencer circuit can be built using several stages, each stage having components such as capacitor, diode, resistor, logic gate.
    If you adjust everything properly, an incoming clock...
  25. Closed: Re: Circuit that detects when an external event induces electrical energy

    My simulation shows another side of circuit action (although it does not provide a full explanation.) At left the layout is similar to the OP. At right the diode points in the other direction.
    ...
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