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Recent content by Externet

  1. Externet

    Hot to reduce 120 vac to 82 vac, 300 watt load

    A wrong answer worth trying if pleases you : Use 120VAC wiring two lamps in series and evaluate if performs reasonably well. 120V----------------------lamp1----------------lamp2----------------neutral. 120V----------------------lamp3----------------lamp4----------------neutral...
  2. Externet

    LED driver directly from 230VAC ?

    Thanks. " ... 3.- can that diode in place of the bridge rectifier be a LED as the ones on the right side of the circuit ? No. LEDs cannot withstand more than 5V Peak Inverse Voltage before the leak towards avalanche failure. " What is the peak inverse voltage on the LEDs at right of the CCR on...
  3. Externet

    LED driver directly from 230VAC ?

    Thank you. A single diode instead of the full bridge also prevents current in the opposite direction, does it ?
  4. Externet

    LED driver directly from 230VAC ?

    Thanks. Shifting a bit the subject; on post #1: 1.- can the bridge rectifier be replaced by one single diode ? If yes, 2.- Will the circuit work more 'relaxed' on lower voltages from a single diode ? 3.- can that diode in place of the bridge rectifier be a LED as the ones on the right side...
  5. Externet

    LED driver directly from 230VAC ?

    Hi all. Do you know of another brand of current regulator to drive LEDs directly from 240VAC ? I cannot find the one I saved its datasheet now. This is similar from ON semiconductor : :
  6. Externet

    How to blow an Aztec Death Whistle

    Hi . If I understood something, a scuba tank (~3000+ psi) with a regulator can provide a very long breath for nearly anything; the energy contained can be harnessed with ease for time or flow or pressure needed and the sum of them too.
  7. Externet

    Shunt measurement of CT measurement

    Some expressions in Morse code allow only the ones who know the subject to respond; 'weeding out' who do not or unsure. I do not know if CT is center tap, or charging transformer, or computerized tomography. Why some posters assume everyone receives their telepathy ? Is it that hard to type ?
  8. Externet

    Bought a german radiocontrolled clock...

    Good day. Tempted to order this module to receive the USA WWVB signal at 60KHz. ---->...
  9. Externet

    Bought a german radiocontrolled clock...

    Thanks. Understood; as the manual has zero specifications on receiving frequency. Just mentions 'RCC' Unknown if built for the US market and its WWV or for european 77.5KHz.
  10. Externet

    Bought a german radiocontrolled clock...

    Hi all. Will it work/receive the time signal in USA ? So far 4 hours on with no signs of acting... What is the typical range of the european frequency, with, without RF skip ?
  11. Externet

    Feedback with delayed audio ?

    Thanks, Brad. Yes, in your proper wording, can some delay detach the output signal from the input ? Tape recorders not involved. Undesired reverberation, echo, feedback for plain voice amplification.
  12. Externet

    Feedback with delayed audio ?

    Hi. In what conditions can a plain public addressing system with internal delayed audio circuitry produce feedback howling ?
  13. Externet

    What would be a good load for testing ?

    Three 220V light bulbs, one at each phase respect to neutral should reveal if phases work.
  14. Externet

    Secondary effects of hull cathodic protection...

    Greetings. Galvanic hull protection works well. What is its electrical effect in the attachment of algae and barnacles biofouling ? Does it prevent, favors or there is no effect in their attachment ? -In fresh and in seawater- I know for sure significant electrical currents destroy marine...

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