So I want to make a DC power source from my moped so I can charge my phone, but my rectifier from the coil puts out DC and AC on my multimeter. Am I doing something wrong or is it broken?
Do you have a capacitor after the rectifier?So I want to make a DC power source from my moped so I can charge my phone, but my rectifier from the coil puts out DC and AC on my multimeter.
I doubt that there are many switching regulators that could generate a stable 12V under the conditions you have (as I understand them).
I've got a rectifier with this: 26mb20 6bI doubt that there are many switching regulators that could generate a stable 12V under the conditions you have (as I understand them).
With a single rectifier, this is what you'd have:
View attachment 192132
The input drops to 0V. Without a filter cap it's not going to work very well.
So you mean that I can't measure the output of a step down transformer? I don't believe any of my meters stop working at measuring low voltage, non mains voltages. His moped puts out AC if it is like most, it uses a flywheel, PM alternator. The rectifier puts out a very bad half wave DC with a high AC bias, basically both AC and DC at the same time, so he is probably telling you exactly what he is seeing on the meter.The AC scale is meant for measuring LINE voltage such as 120VAC @ 60Hz or 230VAC @ 50Hz depending on your country.
Read my text carefully. I said "LINE voltage such as..."So you mean that I can't measure the output of a step down transformer? I don't believe any of my meters stop working at measuring low voltage, non mains voltages.
He is telling exactly what he is seeing on the meter.His moped puts out AC if it is like most, it uses a flywheel, PM alternator. The rectifier puts out a very bad half wave DC with a high AC bias, basically both AC and DC at the same time, so he is probably telling you exactly what he is seeing on the meter.
Exactly, and a step down transformer is no longer at "line voltage". Or for that matter a step up transformer.Read my text carefully. I said "LINE voltage such as..."
That's the battery's job in a case like this. Most of the flywheel generators in modern small engines are PM alternators, and use a shunt to ground for regulation.A lumpy pulse would need quite a capacitor to try to filter to a usable DC.
Thread starter | Similar threads | Forum | Replies | Date |
---|---|---|---|---|
T | Broken Keyboard, Dead Mobo To Refurbished and now random restarts and freezing/crashing | Technical Repair | 0 | |
B | Broken Terminal | Technical Repair | 2 | |
Switch broken off PCB | Technical Repair | 3 | ||
Broken part on a PCB. | General Electronics Chat | 38 | ||
Wire Broken | Technical Repair | 9 |
by Duane Benson
by Jake Hertz
by Jake Hertz
by Aaron Carman