@jackwestly,
Until you get satisfactory results, you're going to be full of inner doubts, like we all (most of us) have been. Stay quiet, because once you'll know how to make it run, then you'll replicate it at will with ease. And it's very easy.
1) could you have a confirmation with a multimeter that each start/end that you declare are really the right pairs for each coil ?
2) if they are, try to reverse one start/end only
Your bulb should be a neon (or any gaz) needing alternative current and rated at least for 65v (because with a filament, it could make contact all of the time, ie : be lit from dc, and it would in fact drive the current permanently). It's prefered than the bulb has a 110v rating ( I've used 220v bulbs with success), since energy peaks may reach several hundred volts, but with feeble amperage (what permits the bulb be lit). The bulb is meant to let you find a good setting ('sweet spot', where the higher the peaks go, since we started from 12v...), AND to prevent your transistor of burning when no battery is attached after it. Oh :and when a charging battery is attached, the buld will certainly not light any more : that's normal.
About your fan stopping but yet 'singing', it may indicate that your setup is right, and that you have a charging battery attached after the diode from the collector, meaning your charging battery is quite empty and 'sucks' all of the current. But : even a 'singing' fan makes the desired oscillations and peaks (see it then as a piezo thing, since sound is oscillation). Those peaks are what charge the 'receiving' battery.
But just try to deplug any charging battery, and the fan should run ok (but keep your bulb attached, for the reasons already said above).
If nothing still works correctly, you then will have to verify that
all of your components are ok (no shorting between the fan's coils; transistor still alive; a good half watt 100 ohms resistor in between a good pot and the base; the diodes should be fine too)
If still not a clue, then try another fan maybe. I, as most of us, have broken around half a dozen fans before I could be sure of the real thing.
Nevertheless are worth each of your failures, as they teach you at least as much as you successes, maybe more.
A very last solution may be found in a low voltage from the main battery that you'd wrongly think is (about) 12.5v.... But it would be really bad luck!
Don't get desperate : once you'll see it running right, then is the very begining of a great journey on a neverending new path of curiosity for what the school didn't teach you.
You're welcome.
Until you get satisfactory results, you're going to be full of inner doubts, like we all (most of us) have been. Stay quiet, because once you'll know how to make it run, then you'll replicate it at will with ease. And it's very easy.
1) could you have a confirmation with a multimeter that each start/end that you declare are really the right pairs for each coil ?
2) if they are, try to reverse one start/end only
Your bulb should be a neon (or any gaz) needing alternative current and rated at least for 65v (because with a filament, it could make contact all of the time, ie : be lit from dc, and it would in fact drive the current permanently). It's prefered than the bulb has a 110v rating ( I've used 220v bulbs with success), since energy peaks may reach several hundred volts, but with feeble amperage (what permits the bulb be lit). The bulb is meant to let you find a good setting ('sweet spot', where the higher the peaks go, since we started from 12v...), AND to prevent your transistor of burning when no battery is attached after it. Oh :and when a charging battery is attached, the buld will certainly not light any more : that's normal.
About your fan stopping but yet 'singing', it may indicate that your setup is right, and that you have a charging battery attached after the diode from the collector, meaning your charging battery is quite empty and 'sucks' all of the current. But : even a 'singing' fan makes the desired oscillations and peaks (see it then as a piezo thing, since sound is oscillation). Those peaks are what charge the 'receiving' battery.
But just try to deplug any charging battery, and the fan should run ok (but keep your bulb attached, for the reasons already said above).
If nothing still works correctly, you then will have to verify that
all of your components are ok (no shorting between the fan's coils; transistor still alive; a good half watt 100 ohms resistor in between a good pot and the base; the diodes should be fine too)
If still not a clue, then try another fan maybe. I, as most of us, have broken around half a dozen fans before I could be sure of the real thing.
Nevertheless are worth each of your failures, as they teach you at least as much as you successes, maybe more.
A very last solution may be found in a low voltage from the main battery that you'd wrongly think is (about) 12.5v.... But it would be really bad luck!
Don't get desperate : once you'll see it running right, then is the very begining of a great journey on a neverending new path of curiosity for what the school didn't teach you.
You're welcome.
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