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  1. Externet

    Radio Waves

    Then you first need to focus on designing a device-circuitry that measures the distance between transmitter and receiver being 5m. Can be complex or as simple as a 5m string between them activating a tension switch. When that gets accomplished, enabling the radio link. There is a reverse...
  2. Externet

    USA to uk convert

    A transformer 240--->120 would be too expensive at >1500W, costlier than the kettle. A 1500W / 120V light bulb or heater/toaster/resistor in series with the kettle would be akward. Check at appliance parts places if the kettle heater element is replaceable with a proper 230V equal. There is no...
  3. Externet

    240V ac LED bulb failure

    Poor solder joints that heat up will end arcing and arcing contacts produce voltage spikes capable of destroying any semiconductor devices. If repair is not the subject, return it to the vendor. An attempt to repair starts by confirming the health of all LEDs by applying 3VDC to each. I would...
  4. Externet

    Is it possible to limit voltage going to a telephone?

    Welcome. I suspect that UK telephone lines have/had more than two wires, as I may have read somewhere. If the wire carrying the (75V+?) AC ringer signal stops its route at a certain switchboard, it can clearly prevent from reaching the telephone on a single pair. So first, confirm; is there...
  5. Externet

    Which chip used to optimize measuring many batteries.ject

    4067 ?
  6. Externet

    Radio waves question.

    Yes, tried to simplify. Perhaps putting colored filters in the light beam would be better.
  7. Externet

    Radio waves question.

    revv : Tonight, shine a flashlight to a far, far target in your neighborhood. A friend there, can tell you if it is on. Turn it off and on six times and your friend will tell you 'six' The light propagated over the air and carried a signal from you to a far, far distance with the...
  8. Externet

    Adding Aux input to older car stereo

    BobK observation is highly valid. We do not know if your sound source mutes if there is no load equivalent to headphones. Every brand and model can be different, and the help we try to provide is partially from blind information. A load to the audio output can well be 100Ω resistors as stated...
  9. Externet

    Adding Aux input to older car stereo

    Hi. I consider a car stereo with a microcontrolled audio path integrated a 'newer' model. My 2000 LandRover received the surgery for an external audio source, only after understanding the data sheet of its audio path management integrated circuit. Better if you start there learning how it works...
  10. Externet

    Adding Aux input to older car stereo

    Welcome. The 'older' part in your question can be a problem to guide you. "Older" with an integrated circuit selecting audio path inputs want to see no DC riding on the audio. If there is some DC with the source, can go into hiccup with the behavior you describe. "Older" with rotary...
  11. Externet

    Rectifier connection question

    That makes a circuit with paralleled rectifiers instead of ´bridge' configuration.
  12. Externet

    Interfacing with old phone mic/speaker.

    The 8Ω sound card audio output should drive well any telephone earset with no need to match any impedance,. The telephone microphone should be connected to the sound card 'mic in' ; with good chances that if polarity is proper, it will work with electret, magnetic and perhaps carbon capsule.
  13. Externet

    Running Phone Lines 50 feet Need Advice

    There is no mystery on extending telephone wires for just 50 feet. They may already be coming from a telco substation for about half a mile. A single Category 1 to Category 5 cable leftovers will provide the needed conductor pairs for both lines.
  14. Externet

    Partially shaded solar panels

    Hi Bob. The panels are mostly, many cells in series. This article explains in my opinion, the partial shading behavior very well : ----> http://sargosis.com/how-shade-affects-a-solar-array/
  15. Externet

    Help identifying a component.

    Perhaps ? ----> http://alltransistors.com/transistor.php?transistor=11363
  16. Externet

    Where to start learning about hobby electronics?

    Suggestions above aim to the internet. I suggest you get a experimenter's kit and pay a lot of attention to its instructional booklet. Hopefully the one you choose is well written. ----> https://duckduckgo.com/?q=electronics+experimenter+kit&t=canonical&iar=images&iax=1&ia=images
  17. Externet

    Salvaging an HDTV tuner for use as an external

    Yes, I would recommend it, as allows even recording programs on a flash thumb drive, and display on a TV with HDMI input. But I said "will make you no good" Here is what I use ----> http://www.x2sat.com/specifications4.html And many other similar : ---->...
  18. Externet

    Salvaging an HDTV tuner for use as an external

    Hundreds and hundreds of televisions in the market and none has HDMI output. Not even composite output. I have a TV tuner with HDMI and composite and USB outputs, but will make you no good.
  19. Externet

    Can't find this symbol

    Means the red cable is a coaxial and its shield/jacket/braid is connected to pin -> A and to J1/P5
  20. Externet

    Instability on a diferential output amplifier

    Welcome back from 'excomunication' ! Not to answer you question about stability; but to ask you to look a little beyond the road on your project. Perhaps you will come across an orphan LCD monitor and will change idea on using such as display, perhaps all the praiseworthy effort and time to be...
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