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  1. Ylli

    Please excuse total noob query regards seeking storm bad signal effect on sat TV

    "Is there any kind of clue in there?" YES!!!!! You are putting the attenuator in a line that is also carrying DC to power the preamp/converter at the antenna. Is there a separate power injection point (would look a bit like a splitter connected to a wall wart) , or does the power come...
  2. Ylli

    Please excuse total noob query regards seeking storm bad signal effect on sat TV

    The aluminum foil is a good suggestion. Otherwise you could try mis-aiming the antenna; Just be sure you know how to get it back to where it belongs.
  3. Ylli

    DC power over coax

    Base band video can go all the way from zero to multiple MHz, depending on the sweep rate. I don't think you are going to have much luck trying to feed the DC power down the line.
  4. Ylli

    Why are there not millions of usable frequencies?

    A pure RF carrier occupies zero bandwidth. But as soon as you add information to that carrier (modulate it), then it uses bandwidth. For example, an AM (double side band) broadcast signal carrying modulation in the audio range up to 5 KHz, will use 10 KHz of spectrum.
  5. Ylli

    Grounding problem in a slimmed down recordplayer.

    If you are going to be still using the old electronics, I would assume the 'RIAA Amp' is just a preamp. does the cartridge you are using need a preamp? Do you have a link to the RIAA amp?
  6. Ylli

    Grounding problem in a slimmed down recordplayer.

    So all you have left of the original 'record player' is the turntable and the tonearm/cartridge, right? Connect the metal from of the turntable to the ground block on the new amplifier. then... what kind of input does the amp have - differential, single ended, RCA socket, etc? And was this a...
  7. Ylli

    Oscilloscope Question

    You will need to connect the charger negative lead to the scope ground.
  8. Ylli

    TDA2030 amplification is very less

    When it is powered up, measure the voltage between pins 5 and 3 of the TDA2030. What is it?
  9. Ylli

    Need help on series circuit

    P = E * I P = 24 [given dissipation of R] E = 24R/(R + 6) [voltage divider to determine voltage across R] I = 24/(R + 6) [Current through the loop per Ohms law) Substitute into the first equation and solve for R. It does end up giving you an easily solvable quadratic equation.
  10. Ylli

    Any help on id of this semiconductor?

    The 2N170 is NPN. The 2N107 was PNP. The NTE101 is generally considered as a replacement for the 2N170. https://www.elliottelectronicsupply.com/transistor-npn-germanium-25v-ic-0-1a-to-5-to-39-case-oscillator-mixer-comp-ftl-to-nte101.html
  11. Ylli

    Strange Chinese battery. Need help finding charger.

    Normally Li-Ion batteries are charge at a constant current up to a voltage of 4.2 - 4.3 volts per cell. Then the voltage is held there until the current falls to a small value. The electronics to control that charging may be in the charger or may be on the scooter as part of it's electrical...
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