Lynn,
You did not say if you were using a bridge or full wave rectifier and is the
transformer center tapped.. Reason I asked, is that I used a transformer
from an old RCA amp, that had a 5650V center tapped . With a bridge, the
circuit breaker would trip with about 7000 VDC, I switched to a full wave
with the center tap for the negative return. Running this to a cap, 40uf,
would give me 4000 vdc. Under full load of 1 amp, the voltage would drop to
3900, with 200K bleeder resistors. Worked out perfect for the 8877 that I
was driving at the time.. I used crossing solid state relays on the input
instead of a step-start, and that works perfect...
Just some of my experiences..
Thanks and 73's,
Dudley
WA5QPZ
jhurry@austin.rr.com
----- Original Message -----
From: "Lynn" <no9z@soltec.net>
To: <amps@contesting.com>
Sent: Thursday, April 10, 2003 1:11 PM
Subject: [Amps] PS project
> Hello all...... I need a little advice on this powersupply project.
>
> I have almost completed a nice 5000 v 2amp supply using a large
> Wilcox transformer with a capacitive filter. 50uf at 7kv.
>
> I found out after construction that the Wilcox transformer requires
> a choke input. The circuit breaker trips (25amp) when sending a
> cw signal from the radio (occassionaly). I believe the output
> impedence
> of the power supply is too low, thus causing excessive current . It
> appears this happens when the ac cycle is at its peak.
>
> Is there a solution to this problem where I can still retain the 5kv?
>
> I understand that if a choke is installed in the b+ the output will be
> .9 of the rectified ac instead of 1.3 times the ac supply volts.
>
> Ideas?
>
> Lynn NO9Z
>
>
>
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