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  1. Externet

    Chosing a Microscope

  2. Externet

    Chosing a Microscope

    Recently responded to a similar request, perhaps fits your needs. Post #2 at ----> https://forum.allaboutcircuits.com/threads/recommended-two-magnifier-lamp-options.184512/#post-1702060
  3. Externet

    Antenna Design to Capture Atmospheric E-field Gradient

    Would the proposed diode be to "nullify" or to rectify AC from transmitting radio stations ? There is no other AC in the air I can think of... If you insert the negative lead of your digital multimeter into the soil and extend the leads vertically with the positive lead all the way up in the...
  4. Externet

    convert 110v dc to 110v Ac

    The inverter in my basement works every day fed by 240VDC and yields 240VAC, 6KW (Tesla H6 / Solarcity H6) Other ----> https://www.ouyad.com/ProductsSolarInverter_164.html For sure chinese make many flavors... but I do not believe them; this one seems to be an empty box filled with...
  5. Externet

    Antenna Design to Capture Atmospheric E-field Gradient

    This does not compute... "100V/m in height" That is huge ! A vertical conductor antenna is a conductor. Conducts. How can it show a gradient if the potential is in a conductor showing the same voltage at all its length - because it conducts ! The potential at the top end is the one that...
  6. Externet

    Does anyone know what this is?

    See, Knife ? Everyday there is a chance to goof and learn ! Then you think... Why didn't the manufacturer marked instead, "250~Y2" and "400~X1" to avoid error reading ?
  7. Externet

    Does anyone know what this is?

    Perhaps 4700 pF±20% ; 2250VAC 'Y' ; 1400VAC 'X' The answer you ask for is mostly "mileage" = Decades of daily activity in electronics, from past, present and future engineers and technicians, learned the hard way reading and collecting books, burning fingers with solder, not simulators, not...
  8. Externet

    Antenna Design to Capture Atmospheric E-field Gradient

    Why do you choose 20m vertical ? A loooong wire (as an existing barbed wire fence) with rectification at the end would not convince you ?
  9. Externet

    Help with two wires please

    On your image with arrows marked; the left arrow supplies one side of voltage to both LED indicators. The right arrow connects to the push switch. If unable to discern beyond, try to sketch a schematic for the traces corresponding to wires 1 and 5 on the plug. Perhaps one is connected to...
  10. Externet

    Never seen this before... have you ?

    A sixteen inch vinyl record. :eek: Next to a standard twelve inch 'long play' for comparison : What do you know about ?
  11. Externet

    Does anyone know what this is?

    Should be a MOV to absorb spikes, or AC rated capacitor to supress transients on the AC line to protect circuitry. Follow its traces if it is across mains, or in series, or make a circuit sketch to find its application. Include the blue one behind too. ---->...
  12. Externet

    Help Needed To Build A Device

    If barking and backfiring are true examples and none the real aim of the project, I see it complex for the firmware to recognize a chosen sound. If it was hand clapping; well, using the existing 'clapper' switch available on the market, you could use the audio detecting stage to trigger your...
  13. Externet

    Capacitor size

    Energy in Joules is power in Watts times time in seconds and is also equal to half capacity in Farads times voltage squared. E = Pt = 1/2 C V^2
  14. Externet

    Need a rectifier schematics

    A rectifier circuit will convert alternating current to 'continuous' current. Can be with one, two, more diodes like 1N4004 and C like 1000μF. Vg is your source from ~4 to ~30VCA . Ignore Rg, RL Vout is your filtered, smoothed CC voltage + that should then be regulated to your stable needs...
  15. Externet

    Need a rectifier schematics

    'Continuous current' as opposed to 'alternating current' -- From a foreign language. In English, 'direct' current does not express well as in opposed to alternating or indirect.
  16. Externet

    Help with shake generator light up wand

    The generation needs is not about Volts from the magnet/coil interaction. It is about Joules or wattseconds. Do not think 3 shakes will be enough, but try and come back with findings. "Highly powerful" magnet and coil means yes, neodymium magnets, coupling and matching. Your second schematic...
  17. Externet

    Help with shake generator light up wand

    Welcome. A single shake to lit a LED for a couple of seconds would need a considerable generation of energy from highly powerful magnet and a properly matched efficient generating coil. Better re-direct your efforts to a mercury switch/manual pushbutton to lit the LED from a battery in it. Seen...
  18. Externet

    Advice on oscilloscope

    Yesterday, I was looking at and tempted by this one: ----> https://www.ebay.com/itm/203512435971?hash=item2f62495503%3Ag%3ArnAAAOSwcBFg3r3y&LH_BIN=1&LH_ItemCondition=3
  19. Externet

    Tecsun PL-600 TA2057 AM FM Receiver Chip Circuitry Question

    If all attempts fail; take the receiver to another neighborhood and power with batteries to rule out interference at your location.
  20. Externet

    12V Soldering iron.

    Check behind your spider webs for a forgotten 12VDC to 230VAC inverter and use your preferred AC iron. Or find an inverter that will allow to use a variety of AC irons. -100W? capable- Just keep in mind that the inverter must be capable of starting at around 10VDC, not at 14VDC as most of the...
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