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  1. AnalogKid

    multivibrator circuit

    For the circuit in post #1, the operating frequency is determined by the electronic characteristics of the transformer and the transistors: winding inductance, mutual inductance, junction capacitance, gain-vs-frequency, load, etc. Adapting that circuit to some other performance, such as higher...
  2. AnalogKid

    Wire connection point to point?

    No, you can't. Your naivete is dripping. In a word - backplanes. A VPX backplane can distribute a 6 GHz signal per pin pair (each signal is a differential pair). That is squarely in the middle of the microwave C band. Normal connector pins (and plastic) do not function well at these speeds...
  3. AnalogKid

    What component is this?

    If you think they are high voltage parts because of the Y that is visible - Don't think so. Using the crystal as a reference, they are way too small to be a true "Y-rated" capacitor of that value. ak
  4. AnalogKid

    Wire connection point to point?

    Then you need to adjust your thinking. You are incorrect. That is not relevant. "Double-sided board" is an industry-standard term. I suggest that you abandon what is in your mind and learn its correct usage. ak
  5. AnalogKid

    Wire connection point to point?

    Double-versus-single sided is, first of all, a description of the bare pc board with no components. This goes back to when there was a huge cost difference between the two. Separate from that is double-sided versus single-sided assembly, something that became a thing with surface-mount...
  6. AnalogKid

    Help with Diode

    Where is the diode connected? It is important. In your context, "diode" is way too ambiguous. 2 W sounds like a zener spec rather than a rectifier spec, but for a zener there needs to be a resistor in series with it. 2 W in a rectifier would be over 2 A of current, way too much for your...
  7. AnalogKid

    Wire connection point to point?

    Pedantically, the two-pin header on the pc board is a plug. We always used a P reference designator for them. We used a W designator for an installed wire. On some boards we use 0 ohm resistors, and those were designated with an R. ak
  8. AnalogKid

    Wire connection point to point?

    Those are jumper wires, solid copper wire that is solder coated or tin plated. For a high-volume consumer electronics product like a VCR (back when), these were stitched into the board by an automated machine with a large reel of the wire. It is a low-cost alternative to a double-sided...
  9. AnalogKid

    Water tank sensor

    The restrictions in your question are not clear. It sounds like there are 4 LEDs already existing in the boat, and you want them to perform the same function. With the new sensor, that **can not** happen without additional components. They can be purchased modules, or a circuit you whip up...
  10. AnalogKid

    Circuit Analysis of Opamp Ckt

    R1-C1-R5 form a 1.5 MHz lowpass filter. Why? The only thing I can think of is to filter out interfering AM broadcast signals or some other medium-frequency interference in the area. ak
  11. AnalogKid

    Variable and alternating flashing LED...

    Nice catch. Post #43 is the answer. ak
  12. AnalogKid

    disassembling Black & Decker cm4000SC

    Nope. Standard drip coffeemaker; no pushing or pressing expressed or implied. ak
  13. AnalogKid

    disassembling Black & Decker cm4000SC

    By convention, an AA cell holder has a spring on one end of each cell location. The spring goes to the battery negative terminal, the flat bottom. That should go to the black wire, also by convention. "Convention" is code for not everyone does it this way, but this is the majority method. ak
  14. AnalogKid

    disassembling Black & Decker cm4000SC

    This is not a grinder. ak
  15. AnalogKid

    disassembling Black & Decker cm4000SC

    Security screw to reduce lawsuits. You might be able to turn it with the tips of small needle-nose pliers. ak
  16. AnalogKid

    disassembling Black & Decker cm4000SC

    There is *very* little stored energy in the electronics of a coffee pot. Even with the heating elemnt running, it draws about 10% of the energy in a microwave oven. Basically, it's a clock-radio - a timer that switches something on and off. There will be some energy in the power supply...
  17. AnalogKid

    Electro Pounce Machine

    1. Nope. It has printing on it that says "Warning - Discharge before touching terminals". Sounds like a cap to me. 2. This thread died over three years ago. ak
  18. AnalogKid

    32kHz clock

    A generic answer for most microcontrollers; your results may vary: If you look at the clock section of the PIC datasheet, it should show a simplified version of the internal schematic for the oscillator. One side of the crystal is driven by an amplifier or gate output. This is the pin to...
  19. AnalogKid

    Help with LED circuit

    Manufacturer / vendor / part number / website for the switch? If it were me, I'd have enough spares that I could open up one and see the innerds. Make up a 6x6 truth table showing the various connections pressed and unpressed. A pattern should emerge. ak
  20. AnalogKid

    Press on press off

    Photos of the pc board? The power might be controlled by a microcontroller (what isn't these days?), making overriding its control program a bit more complicated. ak
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