[time-nuts] 4 KV Power Supply Recommendations
stanley_reynolds at yahoo.com
Mon Jan 18 02:37:44 UTC 2010
Yes even with the mods odds are good the secondary is not well isolated from the frame and even with the extra secondary windings the primary loading is high per turn and load regulation is poor. Over all microwave transformers are not very good, if you goggle them plenty of info and speculation about them. If
you have a matched pair you can turn then into a center grounded configuration. There are ways to limit current and voltage like the incandescent bulbs in the primary, or the autotransformer already mentioned, but mistakes could be costly. HV resistors or strings of resistors could also be used in the secondary to limit current.
/ rambling on
Not sure working on very old cesium standards is very safe much less using factory made PS at KVs to revive old tubes but some people jump out of perfectly good air planes in the name of fun. HV power supplies are scary and yes I have ended up on the other side of the room with a odd metallic taste in my mouth, not sure why I lived so long ? $200 to ebay sounds better than the cost to replace a time-nut, at least this one:-). If you do live to see your homemade power supply working maybe your luck will hold with the tube repair, did for me but I only got a few months of lock light and I'm back to square one.
/ rambling off
----- Original Message ----
From: Bob Camp <lists at cq.nu>
To: Discussion of precise time and frequency measurement <time-nuts at febo.com>
Sent: Sun, January 17, 2010 7:33:16 PM
Subject: Re: [time-nuts] 4 KV Power Supply Recommendations
You also could leave the windings as is and feed the secondary voltage into a voltage multiplier. Still not very safe to wire up.
If you did wire it up, the available current would be pretty massive. I certainly would not attach it to an ion pump I cared about.
On Jan 17, 2010, at 6:53 PM, Stanley Reynolds wrote:
> ----- Original Message ----
> From: Chris Stake <stake at btinternet.com>
> To: Discussion of precise time and frequency measurement <time-nuts at febo.com>
> Sent: Sun, January 17, 2010 5:05:01 PM
> Subject: Re: [time-nuts] 4 KV Power Supply Recommendations
> What is the operating voltage of the magnetron in a domestic microwave oven?
> Although VERY HAZARDOUS, it might be possible to adapt the PSU from an old
> Chris Stake
> Yes, if you remove the transformer shunts and the filament windings and add more primary windings in the space you would get about 2700v with a full wave bridge. You also need to lift one side of the secondary that is grounded to the frame. Yes very dangerous and yes I'm luck to be able to tell.
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