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Old 17th June 2009, 09:37 PM   #1
diyAudio Member
Join Date: Jun 2008
Default Bench supply?

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.
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Old 17th June 2009, 10:53 PM   #2
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Something like this
But fixed at 13.8v.
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Old 17th June 2009, 11:06 PM   #3
star882 is offline star882  United States
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"Fully on MOSFET = closed switch, Fully off MOSFET = open switch, Half on MOSFET = poor imitation of Tiffany Yep." - also applies to IGBTs!
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Old 17th June 2009, 11:20 PM   #4
sandyK is offline sandyK  Australia
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Join Date: Apr 2007
Location: Sydney
Default Bench Supply

Something like this ?

CAT. NO. MP3089 RRP $199.00


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.


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)
1+ $199.00
3+ $178.95
6+ $158.95
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Old 17th June 2009, 11:30 PM   #5
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Thanks star882, sandyK i was looking at something for a summer project, to have a go at building.
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