Search results

  1. AnalogKid

    Loop parasitic

    Way too small of an image. Those serpentines are there because the speed of light is not infinite. For improved noise immunity, very high frequency signals often are routed as a differential pair of traces instead of a single trace. It is critically important that the two traces be of equal...
  2. AnalogKid

    Loop parasitic

    Do you really expect an answer to that? Take a moment, step back, look at what you wrote, and ask yourself this: Does anyone else in the world know shat that means? ak
  3. AnalogKid

    Power factor

    https://en.wikipedia.org/wiki/Power_factor Elapsed time: 5 seconds. ak
  4. AnalogKid

    high voltage electrolytica capacitor vs oil filled

    In function bar across the top of the edit window, the TT dropdown lets you adjust the font size. On another forum I scale all of my posts up to 15. ak
  5. AnalogKid

    high voltage electrolytica capacitor vs oil filled

    Nope, not me. ak Please turn off your CapsLock and Bold.
  6. AnalogKid

    high voltage electrolytica capacitor vs oil filled

    Are you asking about p/n 813058, item #7 on pages 36 and 37? ak
  7. AnalogKid

    high voltage electrolytica capacitor vs oil filled

    Manufacturer's logo / date code / other markings - ? Photo of what you have or what you're trying to replace? ak
  8. AnalogKid

    Book Reviews

    This is a looooong thread. Has anyone posted a link to an old Allied Electronics catalog? Hopefully before they were bought by Radio Shack? Thanks. ak
  9. AnalogKid

    Impedances...

    A normal, typical speaker being used as a microphone has a - low impedance output and requires - nope, there is no requirement. The signal from a speaker can be treated as either a voltage or a current, and can be amplified with either a high or low input impedance amplifier circuit. However...
  10. AnalogKid

    Old board schematics

    Yeah, but I didn't see an actual answer in the thread, and he's still around. ak
  11. AnalogKid

    Old board schematics

    Single-sided and only 25 components. If you know which ends are the input and output, this is not a difficult schematic to reverse. To start, print the bottom side image mirror-image, and start marking up a blown-up image of the top side with traces. To keep the board design single-sided...
  12. AnalogKid

    First post: Tips for stabilizing HC-SR04 ultrasonic readings

    Modules like this one have amazing capabilities for the price, but that low price comes at a cost. The on-board decoupling is barely adequate, just enough to get by most of the time. Better to treat the module like a medium-current opamp circuit: 1 - 0.1 uF ceramic cap with the shortest...
  13. AnalogKid

    Repurpose Bowers & Wilkins A7

    Schematic / service manual - ? ak
  14. AnalogKid

    Fact sheets

    Really? I thought you already had every PDF on this planet. ak
  15. AnalogKid

    Wall LED Light Brightness Reduction

    The light is powered by a non-isolated, universal input switching power supply. Its job is to maintain a constant current through the LEDs regardless of variations in line voltage, component aging, etc. There are several different circuit topologies that can do this. For one of them - If you...
  16. AnalogKid

    Power supply?

    NOTE that the ground for the +/-15 internal supplies and the ground for the main output are n.o.t the same. ak
  17. AnalogKid

    Power supply?

    Yes. This type of auto-ranging is used to reduce the heat in the pass transistors when supplying high currents at low voltages. Stepping down the voltage input to the regulator can reduce the heat by a lot, maybe 75% in some conditions depending on the auto-ranging circuit design. ak
  18. AnalogKid

    Power supply?

    Per the schematic, the power supply circuit output is completely floating with respect to earth ground. That is, both terminals (black and red) are galvanically isolated from the device chassis and the mains earth ground. In some situations, it is desired for the supply's output to be...
  19. AnalogKid

    Power supply?

    The yellow terminal might be a chassis / earth ground. With everything disconnected and off, measure the resistance between the yellow terminal, some exposed chassis metal, and the GND pin on the line cord. ak
  20. AnalogKid

    Setting up a Common Anode Dual LED with one reference point.

    Delete R1. It acts as a ballast resistor, and the circuit will not work with it in place. Yes, the two LED currents will be different. Cost of doing business. If the two LED brightnesses must be approx. equal, achieve this with component selection. ak
Top