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  1. crutschow

    Subwoofer repair

    The feed through for the monitors is to generate the low frequency rolloff to be compatible with the subwoofer response, but you may not need that, depending on what you are using to drive the monitors. Standard surround-sound receivers with a sub output usually have that rolloff built in.
  2. crutschow

    USB Voltage sensors on windows

    Perhaps something like one of these data acquisition modules.
  3. crutschow

    Subwoofer repair

    How much did the subwoofer cost and what is the rated power of the amp? Depending upon your budget, you might replace the amp with a subwoofer plate amplifier, such as one of these.
  4. crutschow

    Problem with stuck relay

    No. It would be in series with either the C or NO terminal. Not if the problem is surge current.
  5. crutschow

    Problem with stuck relay

    Possibly. A resistor in series with the contacts (i.e. 10 ohms) would limit the surge, and shouldn't affect the normal lamp operation.
  6. crutschow

    Problem with stuck relay

    How can it be more robust with the same requirments? So what is the total relay load?
  7. crutschow

    PWM hall effect throttle problem

    That's because there likely is none. Below is the LTspice simulation of a basic differential op amp circuit that should do what you want. It generates a 0 to 5V output for a 0.8V to 4.2V input. The op amp must be a rail-rail type (inputs and outputs can go from ground to the plus supply). The...
  8. crutschow

    Seeking opinion on how to modify this selection knob.

    I just realized you probably want the circuit to remember the last setting and go to that, which means you would need to detect and remember the last of the ten selection lights that was lit before power was removed, which adds another level of complexity. An added microcontroller, programmed...
  9. crutschow

    Seeking opinion on how to modify this selection knob.

    As Harold noted, the initial selection on power-up is likely in the controller software. Nothing you can do to the knob will affect that. The only possibility I see is to determine what the signal output is from the knob to the controller to go from Cotton to Delicate, and add a circuit to...
  10. crutschow

    Controlling DC motor speed and direction with RF remote

    I'm not sure this will do everything you want but here's an example of an RF remote controlled receiver that has four independently controlled SPDT relays. I used the two-channel version with the relays connected in a bridge configuration to control a DC motor on or off in a forward or reverse...
  11. crutschow

    Need a isolated adjustable device to raise signal voltage from .2~.8v --> ~.2~1.0v

    Here's the LTspice simulation of an circuit using two op amps (or one dual) to generate the offset: Pot U3 adjusts the offset from 0V to +0.2V.
  12. crutschow

    Need a isolated adjustable device to raise signal voltage from .2~.8v --> ~.2~1.0v

    What do you mean by "isolated"?
  13. crutschow

    When does a fuse or circuit breaker blow

    Either the wire was too small gauge or the battery couldn't deliver that much current.
  14. crutschow

    Can't find a PCB designer to hire for cool position. Is PCB design completely ignored in schools?

    A side note: Describing a working position as "cool" is not likely to attract experienced designers.
  15. crutschow

    I have become a conservative but brot apathy with me so I don't really mind

    Hard to do that coherently when you are stoned.
  16. crutschow

    Swapping diode for P-MOSFET: reverse spike protection

    It will keep the TVS from clamping properly, as noted in the other posts here. What part of "you can't put a resistor in series with a clamping diode" is hard to understand? The forward drop of one diode would add to the reverse clamp voltage of the other. Why do you want to put two in anti-series?
  17. crutschow

    Circuit selector

    Do you want to switch the power to the circuits, or their output signals?
  18. crutschow

    Making a BULK Floppy Eraser ???

    A small tool demagnetizer, such as this, should work for your purpose (according to the reviews).
  19. crutschow

    Using 2 C005 Timer modules for an on-off timer switch, alternatives for timing, low power?

    Unfortunately, no. The circuit is buried inside the candle.
  20. crutschow

    Using 2 C005 Timer modules for an on-off timer switch, alternatives for timing, low power?

    I have some battery powered LED candles which turn on for about 5-6 hours or so each day and then turn back on in 24 hours. The on-time starts when you initially turn them on. Seem to be fairly accurate as I have a half dozen that I turn on at the same time, and they seem to stay in fairly good...
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