Hey guys,
I'm working on a project here and i'm having problems figuring out the best way to power it.
My project needs two voltage levels: 12v and 5v:
The 12v line should power a DC motor (took apart from a kids ride-able atv toy) the motor consumes about 1A when running, dunno about peak current on start up though.
The 5v line should power all the electronics - a pic micro couple of shift registers and 16 high power leds (at about 25-30mA each) = total of 500-600mA.
I have got my self a couple of AC to DC adapters:
A laptop's adapter which outputs: 16.5v and 4.5A.
And some router's adapter which outputs: 7.5v and 1A.
I already got a couple of 317's and 7805.
I was planning on using one 317 to get 12v for the dc motor and the 7805 for the electronics but if I use the laptop's supply a lot of power will be wasted on heat.
(16.5-12)*1+ ≈ 5w
and
(16.5-5)*0.6+ ≈ 7w
I've found some heatsinks lying around but I don't know their specifications (pics attached).
I guess I would either have to use the two AC-DC adapters to minimize the voltage drop across the voltage regulators or do something crafty with those heatsinks, maybe use couple of power supplies in parallel with the multi TO220 heatsink, or add a fan.
Any suggestions how should I power the project ?
I'm working on a project here and i'm having problems figuring out the best way to power it.
My project needs two voltage levels: 12v and 5v:
The 12v line should power a DC motor (took apart from a kids ride-able atv toy) the motor consumes about 1A when running, dunno about peak current on start up though.
The 5v line should power all the electronics - a pic micro couple of shift registers and 16 high power leds (at about 25-30mA each) = total of 500-600mA.
I have got my self a couple of AC to DC adapters:
A laptop's adapter which outputs: 16.5v and 4.5A.
And some router's adapter which outputs: 7.5v and 1A.
I already got a couple of 317's and 7805.
I was planning on using one 317 to get 12v for the dc motor and the 7805 for the electronics but if I use the laptop's supply a lot of power will be wasted on heat.
(16.5-12)*1+ ≈ 5w
and
(16.5-5)*0.6+ ≈ 7w
I've found some heatsinks lying around but I don't know their specifications (pics attached).
I guess I would either have to use the two AC-DC adapters to minimize the voltage drop across the voltage regulators or do something crafty with those heatsinks, maybe use couple of power supplies in parallel with the multi TO220 heatsink, or add a fan.
Any suggestions how should I power the project ?