[ARC5] (no subject)

[J Mcvey]

How bad can the regulation be? My line voltage doesn't change but a volt or two.However, you will have to use some sort of regulation to bring down the voltage.29X1.4 = 40.6V !!! Silicon rectifiers will only drop it maybe a volt. A beefy variac would be the simple solution. Pot it down to 24- 25V.It works fine there.
I'm using a 25V/65A industrial SMPS for the task. The only thing I don't like about it is the noisey fan.Picked it up at a surplus/junk place for $20. No birdies that I have found yet...It's industrial, so I guess the shielding is pretty good.There are also the inexpensive LED 24V supplies on Ebay that will power it , too.These have issues with birdies on high HF and VHF but can be improved.
 

    On Friday, July 28, 2017 10:10 AM, Mark K3MSB <mark.k3msb at gmail.com> wrote:
 

 Good morning gang...My 28V power supply for my SCR-274N system isn’t quite stout enough so I’ve been using a standalone HV supply in place of the BC-456 dynamotor.   I’m planning on getting the 274 on AM and would like to use the dynamotor (which I’ve rebuilt and runs fine).
 I have a 29-0-29 50A transformer in the pile that I’m planning on using for a new supply (variac controlled) to power the dynamotor. Does a dynamotor need a regulated input?   I recall reading that if the supply for a dynamotor is stout enough a regulated input isn’t needed,  but I can no longer find the reference.Thanks!73 Mark K3MSB______________________________________________________________
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