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  1. M

    grounding dc circuits

    I'm making two devices, both of which will run off of "wall warts" providing 12V. I will be running motors, and have fuses that are rated to about 40% stall current. I'm wondering if I need to (should) ground the DC supply in relation to the device housing. In the first case, I will be trying...
  2. M

    Motor torque for auger - source of 20 RPM AC motor + gearbox?

    Hi, Issue: I'm looking for a motor, preferably AC, with a stall torque of at least 20 Kg(cm) that runs at between (about) 10 and 30 RPM. Do you know of any sources? Background: I'm building an auger to feed powder to coral in an aquarium. There will be a hopper filled with the...
  3. M

    Do I need to use a fuse?

    great! That's exactly what I wanted to know. Thanks.
  4. M

    Do I need to use a fuse?

    I have no idea how to select a proper fuse value. I see some guides online that deal with large DC motors (1/2, 1/3 HP, etc.). But these motors are about the size of my thumb. Any ideas? Thanks.
  5. M

    Do I need to use a fuse?

    yeah, I guess it's easy enough. I might as well. Thanks.
  6. M

    Do I need to use a fuse?

    I'm building an automatic feeder for an aquarium. A timer will be plugged into the wall. An Ericsson Model 420AS44001 power supply (DC6V, 700 mA) will be plugged into this. This will energize two motors, each rated for 6V. This feeder will run unattended. I want to avoid a fire. I'm...
  7. M

    I need to time an AC outlet by seconds, or a break in a DC line

    The "on" duration would be anywhere from a few seconds to perhaps three minutes (multiple times/day). I don't know how a webcam would solve the problem, unless a program analyzed light transmittance through the water (telling me when the food has been cleared) is used. This doesn't address the...
  8. M

    I need to time an AC outlet by seconds, or a break in a DC line

    PROBLEM: I am about to lose my mind. I am trying to accomplish what should be a really simple project. I am trying to automate feeding in an aquarium. For various reasons, commercially available feeders won't work. From a mechanical perspective, I can build one. Timing one is quite...
  9. M

    Fire hazard with small DC motor jamming?

    thanks. A fuse would not have occurred to me.
  10. M

    Fire hazard with small DC motor jamming?

    I'm building an automatic fish feeder. First and foremost, I want to avoid starting a fire. Without knowing too much about electronics, it's my understanding that higher operating temps and higher voltage means higher fire risk. I'm planning to have a small DC motor run off of a wallwart...
  11. M

    Looking for a small, low rpm, higher torque motor. Help please?

    Well, I did some reading and watched a couple videos on stepper motors. I have two concerns at this point: one is wiring the driver/controller, the second is a question of speed. I get the basic gist of how a stepper motor works. I don't get how to wire it to a driver/controller. This isn't...
  12. M

    Looking for a small, low rpm, higher torque motor. Help please?

    Thanks, I appreciate it. I just contacted someone regarding some stepper motors. Hopefully, it goes well.
  13. M

    Looking for a small, low rpm, higher torque motor. Help please?

    I'm looking for a motor to put in an array of four other motors to be run for a long time, and off of a computer power supply. I'm looking for one that can, for all intents and purposes, go "infinitely" slow, by limiting current with a potentiometer (does such a thing even exist?) At most...
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