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  1. WHONOES

    Bridgeless pfc boost charger switching implementation

    Have a look at Power Integrations PFS7523-7529/7533-7539 HiperPFS-3 Ic's. PFC is provided by one iC. Everything you need to accomplish PFC, apart from an inductor and some resistors capacitors and a diode bridge, is incorporated.
  2. WHONOES

    How to eliminate 12V puck light LED flicker?

    Thanks for those kind words Martaine2005.
  3. WHONOES

    How to eliminate 12V puck light LED flicker?

    I expect that your dimmer is not switching fast enough for persistence of vision to dominate. Speeding up the switching rate (frequency) would probably cure.
  4. WHONOES

    Mixing output from 3 op amps

    If you are trying to make a 3 band tone control for your amp then why not use the commonly used Baxandall tone control. In its usual form it provide boost and cut for both bass and treble but is easy to modify to include boost and cut for the mid band. I use exactly that for my guitar amps. It...
  5. WHONOES

    What can I use instead of a 27R resistor?

    You could use 3 x 22ohm resistors in series and then placed in parallel with the 47ohm resistor which will yield 27.45ohms.
  6. WHONOES

    Good Audio Speaker Reference Book

    Why do you want to tune a voice coil to a specific frequency?
  7. WHONOES

    I have question marks about my power supply circuit anyone can help?

    Why do you think you need an extra filter?
  8. WHONOES

    Need a comparator but don't have one?

    I have used opamp's as comparators. They usually require a bit of hysteresis via positive feedback to work correctly otherwise they can have a tendency to oscillate at the point of transition. As for speed that depends on the device used. But, yes proper comparators are preferable and easier to...
  9. WHONOES

    Class D audio amp

    That is exactly the point. It is the shift in time that creates the distortion.
  10. WHONOES

    How to check if this electronic part is functional

    If your DMM is showing OL then the part is resistively open circuit.
  11. WHONOES

    Class D audio amp

    Using a saw tooth will skew the PWM pulses leading to distortion. Re the LM311, my post should have read 200ns not 200μs.
  12. WHONOES

    How to check if this electronic part is functional

    What is the part. Some sort of description please.
  13. WHONOES

    Class D audio amp

    You would normally use a triangular wave rather than a sawtooth for best linearity.
  14. WHONOES

    Class D audio amp

    Try the LM311. It has a 200μs response time. Note that it requires a pull up resistor on its output.
  15. WHONOES

    Detect 5v button push on separate system

    Is it required to latch on.
  16. WHONOES

    TL401 928 -> TL431

    More accurately, it is an adjustable shunt regulator.
  17. WHONOES

    Is this motor driver controller IC capable of reading position info from potentiometer?

    The measured voltage from a wall wart with an unregulated output can be substantially higher than its published value when measured off load, which I assume is what you have done.
  18. WHONOES

    Design of multistage audio amplifier

    Yes you are right it should be 2.8284. Not concentrating properly!
  19. WHONOES

    Design of multistage audio amplifier

    The calculation for the peak to peak voltage required to achieve 1W into 12Ohms is. (Square root of required power x impedance) x 2.484. To calculate the required circuit gain, divide the result of previous sum by the output voltage of your microphone.
  20. WHONOES

    Using a relay to switch voltage in a circuit

    Please give us a diagram of what you propose.
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