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  1. AnalogKid

    60 Hz line frequecy divided to 1 pps

    OUT-STANDING ak
  2. AnalogKid

    60 Hz line frequecy divided to 1 pps

    It looks like the 4013 is a non-inverting buffer. Why? Also, its input is triggered by AC line positive peaks, while the electronics power supply GND is referenced to the AC line negative peaks. Are you relying on the 4013's input stage protection diodes to clip the input AC? 70-80 uA is not...
  3. AnalogKid

    Current limiting in a CC/CV power supply

    Again, no they are not. There are thousands of applications for constant current power sources, including instrumentation, industrial controls, and ... LEDs. Linear Tech and Maxim have dozens of ICs for constant current supplies for LEDs. ak
  4. AnalogKid

    Current limiting in a CC/CV power supply

    Except for the ones that are not. ak
  5. AnalogKid

    Usb AC: Safe or Deadly?

    Give it up. Even at very low power levels, 110/220 Vac is lethal. Also, assuming you want to use this somewhere other than on a workbench, you will have to put the electronics in some kind of enclosure with connectors for external cords. An enclosure that is safe will cost more than the...
  6. AnalogKid

    110 vac relay

    A relay coil is pretty much the opposite of a resistive load, since it is basically a big inductor. That usually is the input to a garage door opener, also, but the door switch input usually is down around 24 V. Given that there already was a question about using this part in a low voltage...
  7. AnalogKid

    Choosing a transistor

    While there are zillions of transistor part numbers, most designers quickly settle down to a small number of favorites. This can be because those are what already is in the inventory at work, the favorites of a mentor, etc. Also, if you roam around the web looking at hobby site schematics, you...
  8. AnalogKid

    DC-DC converter

    After 15 posts, the only information we have about the component being used is that it is black and has 4 legs. So do each of my dogs. Can you post links to the sellers page, a datasheet, etc? ak
  9. AnalogKid

    Chokes on DC power supplies?

    Still not enough words. How long? How heavy? How many units? What power? Distance, wire gauge, total current. ak
  10. AnalogKid

    Problems with a simple power supply

    Correct on both, dropped 0 typo. ak
  11. AnalogKid

    Problems with a simple power supply

    Without getting into all of that natural logarithm goop, lets use the first order approximation of a constant discharge current. EC=IT E x C = i x t Voltage change x capacitor value = discharge current x time t = 0.08333 s, 1/120 Hz (full wave rectified AC frequency) i = 5 A C = 0.01 F (10,000...
  12. AnalogKid

    Problems with a simple power supply

    No, it shouldn't. 27 V is the ***no-load*** peak voltage of the output DC ripple. Under load that peak voltage will sag. The DC energy out of the supply cannot be greater than the RMS AC power out of the transformer. 19 Vacrms x 5 A = 95 W. 27 Vdc x 5 A = 135 W. That extra 40 W has to come...
  13. AnalogKid

    Automated Water Mister (closed circuit soleniod switched off)

    That is a *very* high impedance sensor. Also, it will continue to conduct until the water on it has evaporated. And, the salts and other goop left behind by many evaporation cycles will form a permanent conductive path. ak
  14. AnalogKid

    Automated Water Mister (closed circuit soleniod switched off)

    ??? ak
  15. AnalogKid

    Need help with buzzer in LED automotive turn signal circuit

    First, wouldn't it be Indicator Relay pins 3 and 7? Second, since the signal from the Stop Lamp Switch goes to the Indicator Relay, won't the beeper beep when he stops? ak
  16. AnalogKid

    Need help with buzzer in LED automotive turn signal circuit

    ak
  17. AnalogKid

    Need help with buzzer in LED automotive turn signal circuit

    Don't you mean the P terminal? ak
  18. AnalogKid

    Need help with buzzer in LED automotive turn signal circuit

    ???
  19. AnalogKid

    Need help with buzzer in LED automotive turn signal circuit

    ???
  20. AnalogKid

    Need help with buzzer in LED automotive turn signal circuit

    Here is the datasheet on the flasher. http://cecindustries.com/pdfs/EF33RL.pdf What happens if you connect the beeper to the main turn light output (L)? ak
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