|
|
Post by ourclarioncall on Dec 2, 2019 22:12:56 GMT -5
What would happen if I connected both hot and ground wires of a single coil together ?
I know there would be no sound as it is not sending a signal to the amp but would this create a circuit?
if a string was hit and current is induced in the pickup does it send a current all the way round ?
if so, would you be able to power a light bulb if you added it into the circuit, if it actually is a circuit ?
thanks
|
|
|
|
Post by newey on Dec 2, 2019 23:37:05 GMT -5
Unless you can design a light bulb considerably more efficient than anything currently in the market, you are not powering a light bulb with the output from a guitar pickup. Consider that, even a simple on/off LED indicator lamp in your guitar will require a battery of some sort, you can't power it from the pickup.
But, yes, it is a circuit in your example, and current will flow. If we attached a meter in the circuit, we could observe and monitor it (and, thereby, prove it).
|
|
Deleted
Deleted Member
Posts: 0
Likes:
|
Post by Deleted on Dec 3, 2019 17:17:10 GMT -5
|
|
|
|
Post by ourclarioncall on Dec 4, 2019 13:52:51 GMT -5
Unless you can design a light bulb considerably more efficient than anything currently in the market, you are not powering a light bulb with the output from a guitar pickup. Consider that, even a simple on/off LED indicator lamp in your guitar will require a battery of some sort, you can't power it from the pickup. But, yes, it is a circuit in your example, and current will flow. If we attached a meter in the circuit, we could observe and monitor it (and, thereby, prove it). What if the pickup was the size of a groundhog and the pole pieces as thick as Popeyes forearms ? I guess my query really was, is there current flowing and you answered that , so thanks. I think I’m my head I was thinking of the current as being an audio signal or sound wave , not electricity . So that’s why I wondered if the signal from the pickup could power something that uses electricity (light bulb) instead of being only a signal that could only create sound |
|
|
|
Post by ourclarioncall on Dec 4, 2019 13:59:03 GMT -5
Thanks, the linked picture is helpful This is the kind of thing I really need to understand |
|
|
|
Post by ashcatlt on Dec 4, 2019 14:57:03 GMT -5
The Hammond organ uses magnetic pickups not too unlike the ones we use. One of its predecessors was used WITHOUT AMPLIFICATION directly through the old telephone lines in NYC. You could just call that number, attach a sort of speaker, and listen to somebody playing organ music. The tonewheels filled a big warehouse and the whole thing looked like the engine room of some massive machine.
|
|
|
|
Post by ourclarioncall on Dec 4, 2019 15:06:53 GMT -5
The Hammond organ uses magnetic pickups not too unlike the ones we use. One of its predecessors was used WITHOUT AMPLIFICATION directly through the old telephone lines in NYC. You could just call that number, attach a sort of speaker, and listen to somebody playing organ music. The tonewheels filled a big warehouse and the whole thing looked like the engine room of some massive machine. Wow, pretty cool 😎 The history of the Hammond organ is really interesting too |
|
|
|
Post by ourclarioncall on Dec 4, 2019 15:13:35 GMT -5
The Hammond organ uses magnetic pickups not too unlike the ones we use. One of its predecessors was used WITHOUT AMPLIFICATION directly through the old telephone lines in NYC. You could just call that number, attach a sort of speaker, and listen to somebody playing organ music. The tonewheels filled a big warehouse and the whole thing looked like the engine room of some massive machine. Hammond tonewheel pickup Just watched a vid on YouTube So the tonewheel spins next to a magnet with wire wrapped round it. So is the tonewheel just the equivalent of a guitar string ? A piece of metal that induces charge/current ? |
|
|
|
Post by newey on Dec 4, 2019 23:02:00 GMT -5
Yes, pretty much the same principles in action. A (metal) string vibrates in the magnetic field of the pickup's magnet, this induces a current in the coil's wire. The process works in reverse, too- wrap a piece of metal with the coil wire, run a current through the coil, and you create an electromagnet. If we perturb the magnetic field with a string, we get current in the coil; run current through the coil, and we create a magnetic field.
The alternator in your car uses the same principle to generate power, but rather than move a string through a magnetic field, we just spin the magnets around a coil. And the belt that drives the thing rotates it really fast, and the stator (the coil, basically)is wrapped with pretty thick wire- and so you get a goodly amount of power out of it, certainly enough to power all the lightbulbs in your car and then some.
The generators used to produce electric power in power plants are pretty much the same principle as the alternator in your car, except in a generator we spin the coil inside the magnetic field, rather than spin the magnets around the coil. And, the power plant's generators produce DC, which is then converted to AC before being sent out to the grid. Your alternator produces AC, which then must be converted to 12V DC to power your car's electricals.
|
|
|
|
Post by ourclarioncall on Dec 6, 2019 4:59:58 GMT -5
Yes, pretty much the same principles in action. A (metal) string vibrates in the magnetic field of the pickup's magnet, this induces a current in the coil's wire. The process works in reverse, too- wrap a piece of metal with the coil wire, run a current through the coil, and you create an electromagnet. If we perturb the magnetic field with a string, we get current in the coil; run current through the coil, and we create a magnetic field. The alternator in your car uses the same principle to generate power, but rather than move a string through a magnetic field, we just spin the magnets around a coil. And the belt that drives the thing rotates it really fast, and the stator (the coil, basically)is wrapped with pretty thick wire- and so you get a goodly amount of power out of it, certainly enough to power all the lightbulbs in your car and then some. The generators used to produce electric power in power plants are pretty much the same principle as the alternator in your car, except in a generator we spin the coil inside the magnetic field, rather than spin the magnets around the coil. And, the power plant's generators produce DC, which is then converted to AC before being sent out to the grid. Your alternator produces AC, which then must be converted to 12V DC to power your car's electricals. Cheers, this is definitely the kind of info I need to get a handle on. I’ve been reading up more on how a single coil works so I think it’s starting to make sense. |
|
onemc4you
Rookie Solder Flinger
Posts: 5
Likes: 1
|
Post by onemc4you on Jan 29, 2020 1:05:09 GMT -5
Don’ forget that if your ground wire is shorted to pickup positive. It makes your volume knobs not work as good because the signal is causing the ground to be at a higher And lower voltage. Your amp uses the ground wire to determine what “no signal” looks like.
I have a Ibanez strat guitar now with a good volume pot 250k but because signal is leaking to ground, the volume never shuts off.
|
|
|
|
Post by ourclarioncall on Feb 2, 2020 21:19:36 GMT -5
Don’ forget that if your ground wire is shorted to pickup positive. It makes your volume knobs not work as good because the signal is causing the ground to be at a higher And lower voltage. Your amp uses the ground wire to determine what “no signal” looks like. I have a Ibanez strat guitar now with a good volume pot 250k but because signal is leaking to ground, the volume never shuts off. That’s interesting. Well tonight I was checking the resistance of my pickups in a guitar and it was reading about 3.5k for neck single coil with the volume pot full up but when I turned the volume pot completely down it wouldn’t go to zero it was fluctuating up and down roughly from 5 to 20 k . Not sure what is going on there |
|
|
|
Post by sumgai on Feb 2, 2020 21:41:55 GMT -5
That’s interesting. Well tonight I was checking the resistance of my pickups in a guitar and it was reading about 3.5k for neck single coil with the volume pot full up but when I turned the volume pot completely down it wouldn’t go to zero it was fluctuating up and down roughly from 5 to 20 k . Not sure what is going on there I'd suspect the pot itself. The material on a track is notorious for being sprayed on, and that operation may or may not be "clean". I mean, there may have been some overspray, or even not enough material sprayed in the right places, you never know. Disconnect the wiper and place your meter leads across that terminal and either end terminal. Sweep the knob from one end to the other, and watch your meter. (I mean, gradually rotate the shaft, not quickly.) At each end, you should read either full-on, or full-off. But for most purposes, that full-off might be in 10-20KOhms area. If a true "OFF" is needed, disassemble the pot and scrape the track clean in that small area where the wiper rests. HTH sumgai |
|
