Domain Tools

I’ve measured up to 40 peak amps but could be more.
I was thinking of adding several power supplies to give me the necessary voltage.
Thanks in advance.

Peak amps could be handled by a large cap.

Get a 15 volt transformer good for 20 amps, put a set of diodes on it and a 100,000 uF 30 volt cap. Don’t forget a 40 amp fuse on the output and a 5 amp fuse on the input.

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4 Responses

1. stick Says:
   February 26th, 2010 at 6:25 am

   invest in heavy duty transformer/rectifier.
   References :

2. billrussell42 Says:
   February 26th, 2010 at 6:52 am

   Peak amps could be handled by a large cap.

   Get a 15 volt transformer good for 20 amps, put a set of diodes on it and a 100,000 uF 30 volt cap. Don’t forget a 40 amp fuse on the output and a 5 amp fuse on the input.

   .
   References :

3. Technobuff Says:
   February 26th, 2010 at 7:16 am

   I’m wondering why you would have a need for that?
   I would think that mains voltage tools would be more cost effective than trying to build an 18V power supply. You still would have a heavy trailing lead, so it negates the main advantage of battery operation.
   ???????
   References :

4. cowboyweasel Says:
   February 26th, 2010 at 7:55 am

   A heavy duty transformer (rough calculations 18Volts * 40Amps = 720VA) you can usually push a transformer really hard for a small amount of time so if you wanted to go a little smaller on that you might be able to halve or quarter the VA rating of the transformer (360 or 180VA is still a nice sized transformer) you still would need your electronics to handle the full 40A plus a little safety factor.

   If you bridge power supplies (hook up more than one power supply in parallel and use a single output) you need to make sure that not only you hook them up correctly but also the power supplies are designed to be bridged.
   References :

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