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  1. Tha fios agaibh

    Charging Circuit

    Look into a non inverting comparator circuit. That would light the led when it's charged, but you probably want a more elaborate and safer circuit that would to kill the supply to the cap? If one of those babies explodes, I'd imagine you'd have a very bad day.
  2. Tha fios agaibh

    GFCI receptacles tripped for no reason

    30 years with without gfci outlets I presume. The gfci is seeing an imbalance. Either you have neutrals improperly tied together or there's an insulation problem. It only takes about 3-6ma of leakage current to trip them. Btw, if these are receptacles serving countertops in your kitchen...
  3. Tha fios agaibh

    GFCI receptacles tripped for no reason

    I interpreted the post to mean the red ground fault indicator on the gfci outlet was on. If that's the case it's because the current on the hot and neutral (grounded) are not drawing the same amount of current. Some gfci outlets will trip and not reset if power is lost (in this case because the...
  4. Tha fios agaibh

    GFCI receptacles tripped for no reason

    This is likely the result of having neutrals (grounded white wire) from different circuits mixed together.
  5. Tha fios agaibh

    FM transmitter circuit connection

    The long leads of inductor will change its inductance value. Make sure your using the right type of microphone. Usually an electret type. It will have two wires, hook positive side to the capacitor next to base of input transistor. hook negative side to negative ground rail. Some capacitors...
  6. Tha fios agaibh

    Forklift LiFePO4

    Why are you changing oem components if the supply voltage is the same?
  7. Tha fios agaibh

    Control a knob on a Honeywell fan via ESP8266

    The take away here is that your relays will simulate the switch contacts. If you don't need the switch, just chop off the three wires and tie them to your relays. If you want the switch to work when your wi-fi is not activated, just parallel one wire on each of the three colors. It doesn't...
  8. Tha fios agaibh

    Forklift LiFePO4

    If the voltage is the same it shouldn't impact the internal components of your forklift. Excellent point by shrtnd. I'll add that even if you are using a charger designed for your battery, the forklift is designed knowing the specific weight of a battery. Using a different battery (probably...
  9. Tha fios agaibh

    Aircraft Schematic Question - Landing Gear Indicating Light

    I'm no aviation expert but it appears that wire 8 is the status signal to the light and 18 is always powered for the purpose of testing the indicator lamp. In machinery this is called a "push to test" function. There is a push switch build into each light for this purpose. If a lamp was to fail...
  10. Tha fios agaibh

    Control a knob on a Honeywell fan via ESP8266

    Sides? You have black, red and black on your switch. Presumably black is common. That leaves red for one speed and Brown for the other speed. The switch should only be making contact on one wire (red or brown) when set to slow speed.
  11. Tha fios agaibh

    Control a knob on a Honeywell fan via ESP8266

    Ahh, your getting feedthrough voltage back from motor winding. A loaded meter would give better readings. Plan B: Unplug from wall and chop red and Brown wires from motor. Set meter to lowest scale for ohms. (250Ω?) then set switch to low, then put one lead on the hot prong of the plug...
  12. Tha fios agaibh

    Transistor Problem?

    I'm a newbie too but I'll give this a shot. Q725 pnp has 9v on its emitter. When the base voltage falls .7v below the emitter It causes a current from the emitter through the base and a larger current from the emitter through the collector. This current forward biases Q726 which has its...
  13. Tha fios agaibh

    Control a knob on a Honeywell fan via ESP8266

    Measuring from the incoming White(neutral) wire to the brown wire going to fan, with the fan switch set to high speed. Make note of voltage. Now, move one probe from the brown wire onto the red wire with switch still set to high. Make note of this voltage also. If both brown and red are...
  14. Tha fios agaibh

    Build my own step up transformer 1800s style to power tesla coil ?

    Exactly. It only take about 0.2 amps and one mistake to kill you. I may build a Jacobs ladder myself one day but I'd want it behind a plexiglass guard. Too many inquisitive kids around here.
  15. Tha fios agaibh

    Control a knob on a Honeywell fan via ESP8266

    All the fan motor cares is if it has electrical pressure. You could run the Red and Brown from the fan directly to the relay eliminating the switch function. Or have the switch paralleled like my sketch. That way the switch can override the relays. A note of caution: I don't know if the fan...
  16. Tha fios agaibh

    Build my own step up transformer 1800s style to power tesla coil ?

    Very cool stuff but messing with this stuff is extremely dangerous. For god sake be careful.
  17. Tha fios agaibh

    Control a knob on a Honeywell fan via ESP8266

    Very cool. I initially put two relays in because I thought the relay contacts wouldn't be able to handle the current. With a 10amp rating I'd say your fine. That'll be one high tech fan you got there! Btw, It's not a bad idea to add an inline fuse in this circuit in case something was to go wrong.
  18. Tha fios agaibh

    Control a knob on a Honeywell fan via ESP8266

  19. Tha fios agaibh

    Control a knob on a Honeywell fan via ESP8266

    Something like this if relay contacts can't handle the motor starting current. If module relays are rated high enough, you can eliminate the extra relays.
  20. Tha fios agaibh

    Copper Clad Aluminum vs Oxygen Free Copper use, trade off, voltage drop in DC circuits.

    True, but the main question was regarding wire type/ size. The first step in determining wire size is knowing your load. If running maximum 150amps, 1/0 Al wire has a VD of 20% so the wire is way undersized. Even at 25 amps you have a Vd of more than 3%. (The recommend maximum) There may be...
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