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Recent content by dr pepper

  1. dr pepper

    Replace memory eeprom on a wemos d1 mini

    Thats the thing, I suspect the chip is corrupt. Might be better chucking it if it turns out the eeprom is the problem.
  2. dr pepper

    Replace memory eeprom on a wemos d1 mini

    I've had some data logging software running for a year now, on a D1 mini. The chip has started crashing on random intervals, preumably the eeprom is worn out. I have rigged up a temporary replacement chip as a test to see if it too crashes for now. I assume the eeprom is under the metal cover...
  3. dr pepper

    Positive Ion Generator

    If your making a one off or a small qty you might be able to use a TV line output transformer, otherwise known as a flyback or lopty, they are still around on ebay. They produce a + voltage in the order of 25kv, depending on the model, there are lots of examples on the web of how to make a high...
  4. dr pepper

    Positive Ion Generator

    They use such things where I work, to remove static from paper as its being procesed. Negative and positive ions are sprayed over paper using a linear array of needles. The usual way to make ions from dc is to use a step up switching supply followed by a cockroft walton multiplier, if I got it...
  5. dr pepper

    100khz LORAN receiver mains hum

    Yes centre tap ground is an idea, good suggestion, that only requires one op amp instead of 3. Not sure I could make a balun the rx input impedance is in the order of megohms. I had thought of making the ant shielded, thats not so hard to do.
  6. dr pepper

    100khz LORAN receiver mains hum

    Eloran from Anthorn I beleive is still on trial, hence my comments. You missed one thing, an antenna big enough to spoof gps will go in the boot of a car, one to spoof loran would be either be massive, or require megavolts to be able to transmit any real power. Plus loran has authentication...
  7. dr pepper

    100khz LORAN receiver mains hum

    I dont know how long it'll be on the air, its still on trial, the pandemic cost will probably shut it down. Have a play here you can pick it up on a sdr receiver in the netherlands 100khz. http://websdr.ewi.utwente.nl:8901/
  8. dr pepper

    100khz LORAN receiver mains hum

    I have anisolation transformer feeding the whole bench. Looks like it might be a ground loop problem your right, the noise appears when I connect the 'scope ground lead. A quick unearth (now reconnected) of the 'scope made it worse. The o/p of the rx is a digital pulse train, so if I isolate the...
  9. dr pepper

    100khz LORAN receiver mains hum

    I'm in lancashire and the station is anthorn cumbria.
  10. dr pepper

    100khz LORAN receiver mains hum

    Before I give up on the mag loop I'm going to try shielding it and using it with a differential amp, so neither side of it is grounded.
  11. dr pepper

    Crosstalk on Analog Arduino Ports

    Yep I do that sometimes. It was 5.30 am when I read it.
  12. dr pepper

    100khz LORAN receiver mains hum

    I have been researching commercial stuff on the net. Seems that magnetic or B field ants are not common, e field whips seems to be what boats & planes use. I spose a tuned loop could ring or otherwise distort the phase of the incoming signal, and picoseconds will make a difference to a accurate...
  13. dr pepper

    Crosstalk on Analog Arduino Ports

    Pomms there is a kludge way of preselecting, read the port twice, dump the first reading. I like the way to moisture probe works, they'dve been better using a dual op amp, one oscillating and the other line driving, but I guess its made to a price.
  14. dr pepper

    Designing a Single Board Computer (SBC)

    Not my line but I beleive intel do a series of high powered microcontrollers.
  15. dr pepper

    Crosstalk on Analog Arduino Ports

    Similar to gophers comments, you might be reading the ports too quickly, try a delay of 10ms between reads, the chiponly has one atod converter, the input is multiplexed, its possible the voltage hasnt had time to settle, though thats never happened with me unless the chips been running assembler.
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