Battery pack
Assuming
16 x series connected AAA NiMH battery, 1.2V 600mAh = 19.2 volt at say 30mA gives 20 hours use.
We need four sets of these = 64 cells in total spread over four banks.
Solder lug terminals I assume and wrapped in heat shrink.
Each bank about 40x40x45mm
So assuming say seven guys in a GB 448 cells.
Just a quick look in RS shows this @ £1.43 each + vat
I would think 20% discount is a safe bet so £88.00 a set of 64
Not looked at the charging circuit yet.
Just to say I have ran a pair of PP3 in a turntable motor supply since Teddy came up with the TeddyReg so thats some time ago and its fitted with a three position charge / off / run switch and it is still fine. Charger was a nasty diy implementation of a LM317 with a second 317 as current limit.
Patricks charger is on DIYA post 612 and even simpler.
Trickle charge at 30mA = 30hours ??
Standard charge at 60mA = 15 hours
Fast charge at 600mA = 1.2 hours
We could add an emergency boost charge...
For the Sen I would be looking at an automated charger probably using the mute / lock led or my Arduino.
For Arduino its analog inputs could monitor charge level and display on the screen.
Assuming
16 x series connected AAA NiMH battery, 1.2V 600mAh = 19.2 volt at say 30mA gives 20 hours use.
We need four sets of these = 64 cells in total spread over four banks.
Solder lug terminals I assume and wrapped in heat shrink.
Each bank about 40x40x45mm
So assuming say seven guys in a GB 448 cells.
Just a quick look in RS shows this @ £1.43 each + vat
I would think 20% discount is a safe bet so £88.00 a set of 64
Not looked at the charging circuit yet.
Just to say I have ran a pair of PP3 in a turntable motor supply since Teddy came up with the TeddyReg so thats some time ago and its fitted with a three position charge / off / run switch and it is still fine. Charger was a nasty diy implementation of a LM317 with a second 317 as current limit.
Patricks charger is on DIYA post 612 and even simpler.
Trickle charge at 30mA = 30hours ??
Standard charge at 60mA = 15 hours
Fast charge at 600mA = 1.2 hours
We could add an emergency boost charge...
For the Sen I would be looking at an automated charger probably using the mute / lock led or my Arduino.
For Arduino its analog inputs could monitor charge level and display on the screen.