No juice through bridge rectifier

[monk3manth31st]

I am trying to make my own shake flashlight. I have a wire coil, a magnet, a bridge rectifier, and a capacitor. When I test the coil on its own, it registers a current when shook. However when I connect it to the rectifier, there is no DC current registered on the multimeter.

The current is being measured across the blue and red outputs (see attachment)

I tested the rectifier and it appears to be working. I am perplexed as to why I am not getting any kind of DC reading...

 

[CocaCola]

Diodes have a forward voltage (about 0.7) threshold that needs to be exceeded before they allow flow... Is the voltage created in excess of this? If not the diodes won't allow the flow...

 

[CDRIVE]

These things usually have a large cap too!

 

[duke37]

A bridge rectifier passes current through two diodes so you need 1.4V before it works.
You could try just a single diode, preferably a Schottky (low voltage drop) instead of the bridge.

Shake, rattle ond roll!