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  1. BobK

    How to create multiple simultaneous signal sources from a single reference source?

    Explain what you mean by “simultaneously” for a set of signals of different frequencies. Do they start and stop at the same time, or something else? Nothing is actually simultaneous, give us an acceptable time difference. Also, what do you mean by “a single reference.” A reference for what...
  2. BobK

    Homemade Multi-Drill

    I think he wants a rig that drills multiple holes at once. Bob
  3. BobK

    Sump pump backup

    Just FYI, this forum is for homework, as in problems you are assigned in a class, not for work being done on your home. Bob
  4. BobK

    An amateur requests help with motors

    All of which seem far more complicated than an Arduino, which could also detect faults and shut it down if it was not operating correctly. Why the aversion to digital or programming? Bob
  5. BobK

    Making a Bench Top Power Supply From a 24 Volt 5 Amp Battery Charger

    You might be able to pull it apart and use the raw voltage output, eliminating the charger logic. Depends I guess on how modular the design is. If it is fully inyegrated, this might not be simple. Bob
  6. BobK

    Designing a complete active speaker box

    I’m sure. Bob
  7. BobK

    Electret headphones amplifier

    Electrostatic drivers are capacitors. If the transformer was 25:1, the driving voltage is probably somewhere in the range of 100 to 400V. Do you have any specs for the headphones? Class A is okay because the currents involved will be very small. Bob
  8. BobK

    Adding motor into simple circuit

    D's will give you about 12 times as much run time as AAA, if the AAAs could do the job, which they apparently cannot. Bob
  9. BobK

    Power distribution in a project

    How are you wiring the power and ground to each component? If you are daisy-chaining them, that can cause this kind of problem. You should run power wires from each module to a single point where the power comes in (star configuration.) Also a tank capacitor at that point. Bob
  10. BobK

    Lynx tablet

    Why not just run 5V into the charging input? Bob
  11. BobK

    Adding motor into simple circuit

    No, the internal resistance is higher on the smaller cells, so they cannot deliver as much current. If you short circuit (not recommended) a D cell might provide 10 Amps, whereas an AAA would not even reach 1Amp. Bob
  12. BobK

    LED Tail lights

    It would help if you told us what you plan to do with it. Bob
  13. BobK

    LM2596

    Yep, just like several posters were saying. Bob
  14. BobK

    LM2596

    Care to share with us how you adapted it? Bob
  15. BobK

    Led grow light diode replacement help

    You show two different drivers. What are the other 3? I suspect someone replaced one or more of the original drivers with ones of higher output and that is what caused the failure. Bob
  16. BobK

    12V/5A from 19.5V/4.6A laptop charger

    A switching DC to DC converter. Look for buck converter on EBay. The practically give them away. Bob
  17. BobK

    Controlling Goteck Linear Servo Micro Analog 1.5g GS1502

    Presumably, it is from a potentiometer, same as rotary servos. You have the servo, can you not tell by inspection? How the signal is encoded has no bearing on the question of how the position feedback is done. Bob
  18. BobK

    Controlling Goteck Linear Servo Micro Analog 1.5g GS1502

    It is not the average voltage that controls the servo. If you give 1.5 msec pulses at 50Hz that is a much different average voltage than the same pulses at 330Hz, but the servo will go to the same position. Bob
  19. BobK

    Controlling Goteck Linear Servo Micro Analog 1.5g GS1502

    The servo is not operated by average voltage, is is operated by pulse width. The pulses must be repeated at 20msec intervals. If you are late with a pulse you will get jitter. Bob
  20. BobK

    Is it possible that 2 different Arduinos combined can control 1 motor?

    Why do you need two Arduinos? It would be simpler to do it with one. Bob
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