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Recent content by BrianG

  1. BrianG

    circuit breaker choice

    By the system being 'rail mounted' do you mean the standard DIN rail or similar? If so, what about a regular DIN rail mounted fuseholder?
  2. BrianG

    Replacing through-hole type components with SMD components

    Hi Sanvik, You said in an earlier post that you are 'making this for myself', well have you considered how you will assemble it?. Unless you are having a one-off p.c.b. made and assembled professionally (with all the usual methods such as glue spots, solder paste, hot air reflow etc.), have you...
  3. BrianG

    Switch mounting hardware search

    I'm surprised you say the indent is an extra MILLING operation and of extra cost - are you into mass production of panels?. If you are not into volume panel production then your machine shop is probably 'hand-crafting' the panels and has probably drilled the hole for each switch bush; then the...
  4. BrianG

    Switch mounting hardware search

    BetaGamma - you are supposed to counterbore the REAR of the panel for the anti-rotation tab. That way all you see from the front panel is one neat hex nut (or a round knurled ring depending on the switch type)sitting flush on the first few turns of the thread. The other (lock) nut, the star...
  5. BrianG

    Calculation of Battry for Industrial UPS

    200kW is a serious UPS: scaling up from smaller UPS may not be appropriate as smaller ones often use gel-cell lead acid. The most suitable battery technology will vary with the particular inverter float voltage which will determine the number of cells required. Without knowing the hold-up time...
  6. BrianG

    Is it possible to determine the location of metal object on an inductor cable

    Your original post stated you wanted to 'find the position of the metal object'. Are you effectively just trying to count how many are in a section (relatively easy) or are you trying to identify the position of a specific object? If you are trying to identify a specific object anywhere along...
  7. BrianG

    Is it possible to determine the location of metal object on an inductor cable

    Your requirement is very vague: no object dimensions or metal properties, position detection accuracy required, etc. If you can tag the unspecified objects, how about an RFID system?
  8. BrianG

    Audio through a transformer.

    The problem of buzz or hum is not caused by the fact that it's a *power supply transformer*. The transformer could be picking up fields from any mains wiring near where it's situated, but I suspect it's more likely that you have created some sort of a ground fault and the buzz is coming from the...
  9. BrianG

    Parallel FET Design

    Quote: 'capable of handling a motor with a peak inrush current of 150-175 Amps and a continuous current of about 40 amps' You have not stated what kind of power this motor requires: a.c., a.c. three phase or d.c. so it would help to know these requirements. At the very least it would be best...
  10. BrianG

    Relay Power Dissipation Reduction

    They say never assume, but I assume your circuit includes an anti back emf diode across the coil to protect the switching device? If it does then I would be surprised if the release time is as short as the 1ms shown, since the spec would normally be measured just for the relay on its own...
  11. BrianG

    Wien bridge oscillator, diode stabilized, inconsistent amplitude b/w breadboard and PCB

    You probably don't want to hear this but I spent some time modelling your circuit in Simetrix (a P-Spice program) and although I did not have a model of the LMV751 I used a slightly slower slew rate model of the LMV321. I found that the type of diode made virtually no diference to the amplitude...
  12. BrianG

    Connecting pulse output to Piezo alarm

    There are two problems with your request that require much more detail: Quote: "the signal out is pulse signal based on the flow" 1) You have not given details of the piezo 'alarm' as to whether this is just a simple sounder or something more sophisticated that can be programmed. 2) You don't...
  13. BrianG

    ESD floors & leg straps

    As David has mentioned, the assembly area should have a demarcation line between ESD and non-ESD areas (usually 1 metre away from any sensitive areas). I was surprised you did not mention anti-static overalls or coats in this department. These are mandatory in our assembly areas: no ESD coat, no...
  14. BrianG

    How do I Design an Isolated High Voltage Analog Output controlled by a PWM input from 140V DC

    Vijay, soem questions: How are you measuring ripple and have you analysed its frequency spectrum? I suspect least part of the ripple problem comes from the Vbat 110V supply - what generates this? This supply seems it may have a high level of residual ripple, as at 100% duty cycle you still have...
  15. BrianG

    How do I Design an Isolated High Voltage Analog Output controlled by a PWM input from 140V DC

    Your specification is unclear in a few areas: "Control Signal : 3.3V DC PWM Signal (16 bit)" - 16 bit? PWM by definition is a single bit control signal at fixed frequency, but varying width. Are you producing a separate pulse train width from the value of a (variable) 16 bit word? "Need L/C...
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