Bench supply?

[agithegreat]

Please move me if i'm in the wrong section....

Does anyone know of any decent bench supply designs. I've been working on a few car amplifiers lately.
So i need possibly 40/50a @12v, so +ve and ground will be fine, ideally a remote (12v with just a switch) wil be perfect too.

So far i have tried a 12v battery with a charger across it, but i keep tripping the charger as it can't supply more than 4a @14.4v.
Then i tried a PC PSU whih drops to 11.5v, then cuts out if drawing anymore than 10amps.
However that wont even turn on sometimes if it detects conductivity from the +ve to the -ve terminal.

[agithegreat]

Something like this http://www.maplin.co.uk/Module.aspx?ModuleNo=30391
But fixed at 13.8v.

[star882]

http://www.qsl.net/xq2fod/Electron/PS40/PS40.html

[sandyK]

Something like this ?

http://www.jaycar.com.au/productView...y&form=KEYWORD




CAT. NO. MP3089 RRP $199.00



CLICK TO ENLARGE


13.8V 40A Switchmode Laboratory Power Supply


A high powered 13.8V switchmode power supply delivering up to 40 A and suitable for use in development and test environments. The internal cooling fan will assist cooling at higher outputs and the unit has easy to use 4 mm banana connectors.

Specifications:

Input voltage range: 190 - 240V AC
Output voltage range: 13.8V DC regulated
Output current rating: 0 - 40amp
Output connections: 4mm Banana/Clamp Type
Recommended Fuse: M205 T4amp
Measures: 80 (H) x 117 (W) x 119 (D)
QTY
1+ $199.00
3+ $178.95
6+ $158.95

[agithegreat]

Thanks star882, sandyK i was looking at something for a summer project, to have a go at building.