Search results

Search Forums New Posts
  1. WHONOES

    What should I get for beginning electronics?

    (*steve*) you forgot the Box of Monkeys and the Kilo of brain cells.
  2. WHONOES

    Hall effect controlled fuel injector

    I thought Piezo fuel injectors were the preferred choice these days. Faster and more accurate.
  3. WHONOES

    How to make this circuit unity gain?

    Just did a very quick sum. Dissipation in each emitter resistor is about 220mW for 100mW output. 0.5W or above resistor should suffice. You will soon know if they are under rated cos they will get hot.
  4. WHONOES

    Beginning electronics, understanding whats actually happening

    Have to disagree with post #18. You have to do the basics first. If you are not prepared to go to classes to learn then buy the Horrowitz book. You do not need to read the entire publication before you start playing but, you must learn the basics first.
  5. WHONOES

    PWM generator

    In this day and age, even cheap multimeters often have a frequency meter built in.
  6. WHONOES

    Square wave signal with ADC converter

    If all that you are interested in is the DC level of the signal then, a peak detector is all that you need otherwise, do as Kellys_eye suggests.
  7. WHONOES

    How to make this circuit unity gain?

    The reason that adding the capacitors have a large effect is because they performing what is commonly known as decoupling. Wire has resistance and, importantly inductance. As we should all know (simplifying it a bit) inductance resists the flow of current when the demand is a simple pulse or a...
  8. WHONOES

    What is recommended charger output voltage for a 3V rechargeable AA cell?

    Have a look at the attachment. It has 2 variations on a simple constant current generator. They are both essentially the same with Example A using a PNP Darlington whilst Example B uses a P Mosfet. The current is determined by the Vbe of Q1 and Q3 in conjunction with R1 and R4. R3 and R6...
  9. WHONOES

    DOD Mixer Power (34 V)

    Yeah you're right. Must confess I only took a quick glance at the schematic and clearly missed the supply circuit.
  10. WHONOES

    What is recommended charger output voltage for a 3V rechargeable AA cell?

    One point that is often forgotten in these items when discussing the charging of NiCad and NiMh batteries is that the charge process is only 60% efficient and must be considered when calculating charge currents. Example, if charging a 1Ah cell on the 14hour cycle you would set the charge current...
  11. WHONOES

    DOD Mixer Power (34 V)

    Don't forget that you will have to rectify, smooth and regulate the result otherwise you will blow the nuts out of it if you will pardon the expression. If you need any more info, ask.
  12. WHONOES

    Help me understand a 12V SLA charging circuit.

    I'm with Kellys-eye. Post a schematic without all extra ephemera as the moving dots make it very difficult to read. Also, give us some idea of what you are trying to achieve, just understand the circuit or, make a proper SLA battery charger!
  13. WHONOES

    Edifier x600 subwoofer very weak sound

    It could be out of phase with its compatriots.
  14. WHONOES

    What should I get for beginning electronics?

    Further to my earlier comments. There is no quick and easy path to learning about electronics. I suggest that you buy yourself a copy of Paul Horowitz's book "The art of electronics". It is available on Amazon's site and will tell you everything that you need to know. Over the years it has...
  15. WHONOES

    Inrush current smps.

    Very common method for reducing inrush current.
  16. WHONOES

    Powering one 12v device from two 12v sources

    Very valid point duke37.
  17. WHONOES

    Resistors in combination circuit help

    Sorry but you simply don't need to calculate the voltages to get the correct answer. I think the method used is the quickest and least confusing. If you wish to know the voltages it may be done afterwards with no confusion. That is my last word on the subject.
  18. WHONOES

    Resistors in combination circuit help

    Yes but the whole point of my reply was that you don't need to calculate any voltages at all. The original question had no requirement to do so. Your bit of maths is correct, I just couched it such that is was easier to understand.
  19. WHONOES

    Resistors in combination circuit help

    No but the other proposed solutions were getting a bit misleading. At least she will know what to do next time in a similar situation.
  20. WHONOES

    Resistors in combination circuit help

    No. Re read my reply. The only sums you need to do are those described. My description is the entire solution.
Top