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  • Users: benta
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  1. benta

    Which DMM can you recommend?

    My old digital multimeter has passed away and I'm looking for a new one. I've looked at the Fluke 175, but find it somewhat pricey. It has the functions that I need, plus some that I don't need, for instance TRMS, where my feeling is that you pay quite a lot for that. I need: Resistance AC/DC...
  2. benta

    Looking for 4046 PLL experience

    I'm working on extracting a clock signal of around 15 kHz using the CMOS 4046 PLL's type II phase comparator. The type II phase comparator should ideally lock the VCO to the input signal with a 0 degrees phase difference. The 4046 datasheet always shows a first-order loop filter with one or two...
  3. benta

    Precision active filters û real-life experience sought

    I’m consulting on a project where an active low-pass filter with a cutoff around 40…50 kHz is needed. Filter order/type would be 4…6th, maximally flat group-delay (no, this does not mean Bessel, but almost). The filter is to be used for reference and calibration, which means that it must be very...
  4. benta

    Comparator with constant offset

    I'm working with two voltage levels where I need a comparator to switch when the difference between the two pass 100 mV. Problem is, the common-mode voltage varies, so I can't make the offset between the two inputs using resistors. One voltage is DC, the other is 16 kHz pulses. Can anyone...
  5. benta

    PAL TV - white peaks during vertical blanking

    While trying to troubleshoot some video instability in an analogue cable-TV net, I observed the following: During the vertical front porch period, there is a white (100% level) white spike approximately 2.5 lines before the vertical sync pulse. Additionally, during the vertical blanking period...
  6. benta

    "Inverse" VDR

    Hi: I'm looking for a component that probably doesn't exist, but I'd like your input all the same. Application is a tachogenerator for a motor with a wide rpm range. The TG is driving two optocouplers with antiparallel LEDs for isolated mesurement (forget about the secondary side). The problem...

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