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  1. BobK

    Tri-Gate High Side Load Switch: Does it exist?

    74125. 4 to a package. There are others if you don't need individual enable inputs. edit: this probably is not what you are looking for through, please explain 3-state high side switch. Bob
  2. BobK

    How to increase 555 Timer Frequency

    The duty cycle of his circuit is 67%. The cap is charging through 2 68K resistors and discharging through 1 68K. Bob
  3. BobK

    Pulse Train Detection

    I think the 150nS pulses are going to be a problem. I doubt that a 555 would deal with them. You would need some fast logic to do this. A pulse stretching circuit comes to mind. I think there was a thread on a fast pulse stretching circuit on this forum. Bob
  4. BobK

    Getting more gain from 5532 op amp?

    I would go with higher resistors all around though. 10K 100K and 100K. The 1K input resistor is probably loading that input more than it should. Bob
  5. BobK

    How to not hear Mylie Cyrus when I am playing guitar?

    Dieter, You are a unique individual. I can see that you really want to learn. But instead of doing the work, you jump to conclusions that are incorrect at every opportunity. Find a discussion of the RLC circuit and really try to understand what is going on. Ask questions if you do not...
  6. BobK

    Can I do this with 2 Mosfets, LEDs in series.

    And, just checking, the two grounds are connected together, right? Try connecting the gate to the + and to ground alternately to make sure it is acting as a switch. When open, as Steve said, you don't know what it will do. Bob
  7. BobK

    N channel high side switch

    That would put 600V on the gate of the MOSFET. Not a good idea. Bob
  8. BobK

    Make triangular wave using 555 timer

    Should be alright at 20KHz.
  9. BobK

    Can I do this with 2 Mosfets, LEDs in series.

    You have the source and drain reversed. Bob
  10. BobK

    Make triangular wave using 555 timer

    That depends on the opamp you use. Bob
  11. BobK

    N channel high side switch

    You can get high-side driver chips that will do this. A DIY solution would be difficult. Bob
  12. BobK

    programming help!!!!

    Both 0x1 and 0x0001 are of type int according to the C standard. If there is a difference in code generation using these two representations, that is a compiler bug. Bob
  13. BobK

    Can I do this with 2 Mosfets, LEDs in series.

    Show us how you connected the MOSFET, and link to the datasheet for it. Bob
  14. BobK

    230ac to 5vdc

    You don't need 2 regulators. What you need is a larger capacitor where C1 is. Something like 1000uF. Bob
  15. BobK

    Seven Segment Display

    Yes, you need a BCD to seven segment decoder. Bob
  16. BobK

    Resistance???

    A resistor in series with the bulb IS a voltage divider. Bob
  17. BobK

    Resistance???

    A resistor in series with the bulb IS a voltage divider. As Steve said, adding another resistor does nothing but waste power. Bob
  18. BobK

    Power Consumption

    The specification in the ad say: Power Consumption:0.53W To measure, simply place an Ammeter in line with the +12V power input, and measure the current when operating. The current * 12 is the power consumption. Bob
  19. BobK

    4 quadrant speed control of brushed DC motor

    All you need to make a PWM controller is a 555 and and few resistors and capacitors. Google "555 PWM circuit" Bob
  20. BobK

    Resistance???

    Not really. As soon as you connect a bulb to the circuit, it no longer holds the same voltage because you have changed one of the resistors. What you need to make a 5V bulb run of 12V is, first to know the current the bulb takes at 5V. After you know that, you use a single resistor in series...
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