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  1. WHONOES

    Is this a low pass filter?

    If you are in the USA, have a look at the Madisound website.
  2. WHONOES

    Hall effect ignition

    The ground connections for the IGBT and Sensor must go to the same point using very short wires, these in turn must be as thick as you can make them. Also, do not use single strand wire, the more strands the better. Do not take the ground return for the coil to the same point. Capacitor C1 is...
  3. WHONOES

    Hall effect ignition

    Yup. I agree with duke37's comments. Layout of these sort of circuits is very important.
  4. WHONOES

    Hall effect ignition

    It is possible that charge is being transferred to the gate via collector gate capacitance. A way to quench this would be to insert a resistor in series with the gate and then either a 12V zener diode from gate to ground or a high speed diode with anode to gate and cathode to 12V. Also there...
  5. WHONOES

    Locating 10mm LEDs

    I don't know which country you are in. Try a supplier like Farnell, RS Components, DIGIKEY or Mouser. These are the better known companies.
  6. WHONOES

    Help with fence charger schematic

    The 24V supply will be useful. You will need to reduce it to 12 or 15V for the control circuitry. A simple 3 terminal regulator such as an LM7815 or similar will suffice.
  7. WHONOES

    Help with fence charger schematic

    Hi. I am looking at a design for an HT provider that should fulfil you requirements. You will need to drive it using a 12 to 15V dc power supply. A transformer - rectifier off of your 155v ac supply should do that bit. If this is no good, say so here and I will stop. The circuit I have in mind...
  8. WHONOES

    Will this charger work?

    If you charger is not .............. charging, you could have a dead cell in one of your batteries, that would cause you problem. You could check is this is so by connecting a car headlight bulb across each battery in turn. The one that doesn't light up is the culprit. If you do have a dead...
  9. WHONOES

    Display for 3D printer

    I wouldn't trust it.
  10. WHONOES

    Will this charger work?

    A I have said elsewhere, you need 2.35V per cell to charge lead acid batteries. If you re using sealed lead acid types, you should limit charge current to 25% of capacity. If you have 3 of varying capacities, set to the smallest one.
  11. WHONOES

    Display for 3D printer

    Why do you want to use UV Led's. I assume you realise that constantly gazing into UV of any source will permanently damage you eyesight and is not to be trifled with!!!!!!!!!!!!!!!!!!!!!!!!
  12. WHONOES

    Meaning of balance current: 36/72+-5mA for Battery spec?

    To keep series connected Li-Po batteries in good health, the cells need to be voltage balanced when they are charged. This is normally done by placing a resistor in parallel with each cell during the charge cycle so that all cells assume the same voltage. You need to select a resistor to reflect...
  13. WHONOES

    Transistor Help

    I'd go for a logic level N Mosfet such as the IRL530.
  14. WHONOES

    Will this charger work?

    If your charger is only 36V, that will not be enough to charge 3 batts in series. You will need 42V. As 73's de Edd said one with lowest charge will dominate.
  15. WHONOES

    Amp-hours, computer desktop power backup duration

    Buy a small generator. They are quite cheap these days.
  16. WHONOES

    24v battery charger

    A lead acid battery needs 2.35V per cell to charge. 12V battery is 6 cells thus 6 x 2.35 = 14.1V. This is applicable to any voltage battery just multiply No of cells x 2.35.
  17. WHONOES

    Op-amp buffer

    Can you show the rest of the circuit including the input load and whatever the opamp is driving?
  18. WHONOES

    Design of a DC voltmeter circuit

    Much easier to use an opamp. Better results too.
  19. WHONOES

    lm 317 tip 3055 constant current

    Are you just after a constant current source?
  20. WHONOES

    timed circuits with electromagnets

    I agree. Using a Johnson counter should be easy, just need a frequency source again easy, and mosfets on the outputs.
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