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  1. crutschow

    How do I make an opamp stereo mixer?

    What do you think midscale should be for a log response? Actually it's a reasonably good curve (simulation below of pot output versus wiper position): The yellow curve on the bottom would be straight if it were perfectly logarithmic, since the left axis is plotted on a logarithmic scale. As you...
  2. crutschow

    How do I make an opamp stereo mixer?

    Below is the portion of you need from the circuit Bertus referenced if you just want the mixer and don't need controls: For a gain of 1, change R115 to the same as the input resistors, 10kΩ. You an operate that circuit from a single 5V supply (connecting U3A's pin 4 to ground) if you generate...
  3. crutschow

    Differential coax cable vs 2 single ended coax cables

    If there is external radiated noise, it could affect the differential signal differently if the two cables are not close together. The difference likely would be small, but keeping the cables close together will minimize it.
  4. crutschow

    Differential coax cable vs 2 single ended coax cables

    For a flat band at that frequency you would likely want high speed shielded, twisted-pair and connectors such as these. If obtaining those types are a problem, you could try the two coaxes and see how it works, if you have that option. If so, make sure the two coax cable are as identical as...
  5. crutschow

    Differential coax cable vs 2 single ended coax cables

    The cable will introduce little noise. What is the nature of the signal and its level? It's just more complex, and any differences in the two cables will introduce differential distortion and noise into the signal. If you have a differential signal, then you should use a single differential...
  6. crutschow

    Differential coax cable vs 2 single ended coax cables

    Normally a shielded twisted-pair is used for differential signals. High frequency twisted-pair have a characteristic impedance of around 100 ohms. Ethernet cable is 100Ω twisted-pair, for example, and you could use ethernet connectors. I wouldn't recommend trying to use two coax for that.
  7. crutschow

    Looking for Wi-Fi Modem recommendations

    So you need to contact them and determine what modems are compatible with their signal.
  8. crutschow

    Looking for Wi-Fi Modem recommendations

    Who is your internet signal source? You need a modem compatible with that.
  9. crutschow

    Potential energy of suspended mass expressed in kWh

    It has nothing to do with SI units. K means 1000, so you divided when you should have multiplied.
  10. crutschow

    How can I fix an unformattable raw micro SD card?

    You are beating a dead horse. :rolleyes:
  11. crutschow

    Potential energy of suspended mass expressed in kWh

    You need to multiply KWs by 1000, not divide by 1000 to get Ws. So the the answer is 2270 Ws (if the rest of you calculations are correct).
  12. crutschow

    Pioneer S-W700 Subwoofer

    Unless it's a wide trace, small wire-wrap wire is insulated and easy to use.
  13. crutschow

    12 volt delay timer

    My HP42S (virtual) calculator on my computer gives 57.29577951308232087679815481410517 degrees. Good enough for government work. ;)
  14. crutschow

    automatic forward reverse motor with limit switch and relay

    D - Diode/Rectifier U - Label for an active component (here the relays and limit switches) R - Resistor C - Capacitor If you don't know what those components are, then look up their description.
  15. crutschow

    Video signal DC level adjustment

    Don't understand your concern about the DC level. What DC level? Is power being sent along the same wire?
  16. crutschow

    Vacuum Tube Clock

    You might look at this, discussing the operation of a HP tube decade counter. Also look at the Dekatron tube.
  17. crutschow

    Random digital potentiometer driving

    If you tell us the purpose of this random signal, we can better help you, since right now it's pretty vague.
  18. crutschow

    Random digital potentiometer driving

    What is the type of input and number of bits for the digital pot?
  19. crutschow

    Random digital potentiometer driving

    Is that time to be fixed or random also?
  20. crutschow

    P-Channel MOSFET always on

    Yes, sounds like you have the P-Channel source and drain reversed. The source must go the the +12V.
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