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Recent content by oscillationeer

  1. O

    Very high speed switch?

    You need to apply voltage gain so that dV/dt out is over 5 times the 'leading edge' of the STM32 drive signal. A fast NPN transistor, with R//C emitter load, possibly in cascode with a higher voltage drive transistor, can give you a fast output fall-time, and Baker-clamping the base to...
  2. O

    Monitoring HV

    The photomultiplier has a negative cathode potential, right? So, buffer your ADC input with a big current-limit meter resistor, into an inverting op amp configuration. That allows you to diode-clamp the op amp input pin to GND without disturbing the measurement. Something like -.001 voltage...
  3. O

    Thermocouple good at room temp is good always?

    Any standards-compliant thermocouple wires will give good enough accuracy for your '4 to 5 degrees' specification, but your 'thermocouple reader' and extension wires, and thermocouple in combination, can NOT be tested adequately with only one temperature measured. The best practices for...
  4. O

    Intrigued about this question on convolution

    Much of real information comes in scattered bits and pieces; a record of birth dates, for instance, might be summarized by a bar chart with one bar for each month. This kind of data, a 'distribution', has features (like peaks, valleys, slopes) which allow u s to consider the distribution to be...
  5. O

    Questions about ULN2003

    The section 6.1 of that data sheet says the absolute maximum (presumably a wire-melts limit) for the emitter current is 2.5A; that means that the 500 mA peak currents of five inputs will push it to the limit, and leave no margin for a sixth or seventh to turn on. All of the output collector...
  6. O

    Micro spot welder ?

    The common solder-pistol is an AC transformer with very low impedance output that has intrinsic current limiting (in the primary winding and core material). So, if you can make and position spot-weld contacts for your small joints, a simple trigger pull will power it. Solder gun If you want...
  7. O

    Quantization Noise/Error in an arbitrary system - What new can be done?

    Tricks like sigma-delta modulation start with a sample (charge, current) and apply multiple steps to create a number. The sample, of course, is quantized (has a number of electrons captured on a capacitor, for instance); that is already a statistically variable quantity, since you cannot capture...
  8. O

    Binomial Antenna Array

    Pascal's triangle (the binomial coefficients) in high-order limit becomes a Gaussian curve, proportional to exp(-c*r^2 ). Do you really need integers for the elemental amplitudes? Do you really need a 3x3 square (as opposed to hexagonal array or irregular) layout?
  9. O

    Flyback SMPS core loss

    The flyback case isn't like a symmetric triangle wave; excitation has net DC component, and that flyback event has a steep slope, probably higher harmonic frequency content. The copper losses are also growing fast when the drive current nears saturation. Temperature measurement of a...

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