I was asked to look at a Rolson torch which should be shaken to generate energy to light a LED.
I wonder if it ever worked as a shake torch.
There is a bridge rectifier made from four 1N4007 diodes.This was permanently connected to two CR2032 3V lithium cells and a black cylindrical component, 10mm dia, 5mm long. A solenoid coil of 4.8thou wire, 212Ω, 27mH, 23mm long, 21.5mm od was connected across the bridge. A magnet, 15.2mm dia, 17.5mm long was fitted into a tube and allowed to slide inside the coil with a buffer at each end.
A white LED in series with a 5Ω resistor could be switched to the bridge.
The two cells were showing 0V and 0.1V so these were removed and the torch shaken vigorously to no effect.
A 3V meter on ohms range would light the led.
I assume that the small cylindrical component is a super dooper capacitor but those I have looked up have a maximum voltage of 5V and here it would be continuously connected to 6V.
Can lithium cells be recharged?
Do you think that 1N4007 diodes are man enough for the job?
Is this a scam, it being just a small battery driven torch?
Should I remove the capacitor, replace the cells and forget shake rattle and roll?
It was interesting but probably pointless.
I wonder if it ever worked as a shake torch.
There is a bridge rectifier made from four 1N4007 diodes.This was permanently connected to two CR2032 3V lithium cells and a black cylindrical component, 10mm dia, 5mm long. A solenoid coil of 4.8thou wire, 212Ω, 27mH, 23mm long, 21.5mm od was connected across the bridge. A magnet, 15.2mm dia, 17.5mm long was fitted into a tube and allowed to slide inside the coil with a buffer at each end.
A white LED in series with a 5Ω resistor could be switched to the bridge.
The two cells were showing 0V and 0.1V so these were removed and the torch shaken vigorously to no effect.
A 3V meter on ohms range would light the led.
I assume that the small cylindrical component is a super dooper capacitor but those I have looked up have a maximum voltage of 5V and here it would be continuously connected to 6V.
Can lithium cells be recharged?
Do you think that 1N4007 diodes are man enough for the job?
Is this a scam, it being just a small battery driven torch?
Should I remove the capacitor, replace the cells and forget shake rattle and roll?
It was interesting but probably pointless.