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  1. BobK

    help with voltage divider

    If you operate the converter well below its limits it should not be a fire hazard. Using a fuse is always a good idea, though. How much current are we talking about? Bob
  2. BobK

    pre amplifier/ line in mixer chip

    If you think you can hear the difference between 0.0003% distortion and 0.01% distortion, you are wrong. Bob
  3. BobK

    help with voltage divider

    You cannot use a voltage divider to supply power. The are used only to set a voltage very small currents are drawn from. You can put a resistor in series with a 6V motor and connect it to 12V, but this is not ideal either, because the resistor would need to use as much power as the motor...
  4. BobK

    sensor to detect soccer ball

    Say the ball blocks a sensor for 10cm of it's flight path. That is 3.6mS. Plenty of time for a phototransistor to respond. Bob
  5. BobK

    interupting a circuit

    A monostable multivibrator. Bob
  6. BobK

    Analog to Digital Signal Block Diagram Confirmation

    It is almost correct. If the resistor is connected between the sensor output and ground, and the ADC input is connected to that junction it would convert a 4-20mA current to 0 to 5V, which is what I think you want. Bob
  7. BobK

    Wiring a fan

    You sure did, the most important one! 2.5 Cut the power at the breaker box and test again to make sure it is off before touching any of the wires. Bob
  8. BobK

    2 pole low frequency shelving filter design

    Without knowing what the input signal is, it is hard to determine what effect you are talking about. Bob
  9. BobK

    Audio Amplifier distortion issue

    There is a 22K pot in the circuit as a volume control. He says he used a 10K in series with a 12K resistor in the original post. Bob
  10. BobK

    Audio Amplifier distortion issue

    One more comment. Just replace the 22K pot with a 10K pot, no series resistors needed. The important thing is the ratio of the two resistors formed by the pot, not the absolute value. 10K should work fine. Bob
  11. BobK

    Using $1 stereo amp in mono mode

    It is not likely that the amp is inferior, more likely the speaker drivers, which have to be quite small. Bob
  12. BobK

    Using $1 stereo amp in mono mode

    You could safely go down to 33Ω resistors for typical headphones, which are 32Ω. This would give you the same sound level as a mono amp without the resistor. Bob
  13. BobK

    Newbie Question

    Based on your OP, "Circuit Help" would probably be the appropriate forum. Bob
  14. BobK

    What is your favourite type of component?

    I got back into electronics after a long hiatus when I built a new charger for my drill/driver batteries. I used a PIC and made a current regulated buck converter and the deltaV termination criterion. When this actually worked, I was hooked on PICs. Edit: I did not know about hardware PWM...
  15. BobK

    Constant voltage load

    Nitpick: The 2N3904 is NPN, I think you mean 2N3906. Bob
  16. BobK

    Trying to find out the name of a type of component.

    Not really. It triggers at some specific voltage but then continues to conduct at a much lower voltage. Bob
  17. BobK

    Load Balancing.

    Here is the proof. V1 is fixed at 10V, V2 is varied from 9.9 to 10.1V. Notice that at 100mV difference, about 80% of the current is supplied by the higher voltage supply.
  18. BobK

    Load Balancing.

    That circuit pretty much guarantees unequal sharing. The regulator with the higher voltage will supply most of the current. Bob
  19. BobK

    Applying a Sensor Output Analog voltage to a microcontroller

    Okay. All you need to do to use it in 10V mode is to use a voltage divider to drop the voltage in half. Bob
  20. BobK

    Applying a Sensor Output Analog voltage to a microcontroller

    I don't understand. Why not just operate the sensor in the 0 to 5V mode? Bob
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