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  • Users: atferrari
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  1. atferrari

    Sheathing material - Right name

    I ve seen quite often, the expresion "gauge", used to name the metallic covers employed for sheathing steel coils for transportation. Is is a right name? Dictionary seems to be of no help here. The material is some 1 to 1.5 mm thick. May I also call it "metallic plate" or what else if not...
  2. atferrari

    Low pass filter failing at the lower range

    Please let me ask about this without showing any circuit, YET. There is an active 4-poles Sallen Key lowpass filter. Cut off freq (-3 db) = 740 Hz. Both LM 358 opamps fed with +/- 9 V and duly filtered. At the input, the signal from a network of 12 resistors driven by CMOS shif registers...
  3. atferrari

    LT Spice generating a repetitive signal

    Using LT Spice, how could I simulate a repetitive signal with 12 levels between +2V and -2V? Intention to use it as the input for a passband filter. Initially I tried a voltage cell with PWL output but found that it does not repeat! My fault. Any help out there? I will appreciate that...
  4. atferrari

    Evaluating measurements

    I programed a PIC 18F to generate pulses going from 120 to 6000 Hz. Measured the output with two frequencimeters (ME and WA) plus the reading from an analog TRIO scope. In the Excel file I listed following values: PIC: frequency expected at the PIC's output. WA: frequency values obtained with...
  5. atferrari

    Interrupts - Updating timers inside the ISR - PIC micro

    Micro 18F452 - Working in assembler. I plan to derive timing for two simultaneous processes using: a) CCP1 in compare mode against TMR1 that generates a clock which should exhibit NO jitter due to TMR0 interrupt occurrence (see below). This clock has no 50% duty cycle so CCPR1L and CCPR1H...
  6. atferrari

    Measuring AC parameters digitally - Basics

    AC voltage applied to a non linear load. Using a DSP processor, I digitize the resulting voltage and current along several periods (100 samples per period) and detect zero crossings, so I can calculate: a) Vrms, by squaring each sample, summing all of them, taking its average and finally...
  7. atferrari

    HV p. supply- Sensing / limiting current

    The output of my dual variable p. supply goes from 1 to 45 V with a max. current of appr. 2A. Same specs for each rail. The PICmicro in charge has to mannage the setting of current limitation requiring sensing of load current for each rail somewhere around the pass transistor. When considering...

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