Steve,
Keep in mind that most of the step up/down transformers sold are
actually autotransformers. One side of the primary is connected to one
side of the secondary. This should not be a problem regarding operating
your 120v stuff, but don't ground either side of the secondary.
73,
Victor, 4X6GP
Rehovot, Israel
formerly K2VCO
CWops no. 5
http://www.qsl.net/k2vco/
On 31/12/2022 1:25, Steve Bookout wrote:
Hello all,
My question was not intended to start a 'smartest man in the room'
debate. I just had a genuine question. Electronics is my hobby and
never was my profession, so I can't get into the 'Grey matter debates'.
I did get several good responses to my original question and have
decided on a course of action. This amp is being built with parts
gathered, here and there, over 4 decades, so not much is 'ideal'.
My several blowers are all 120 volt.
I do not have a 120/240 volt filament I can use to use the dual input
windings center tap as a neutral.
I have ordered a 500 watt 240>120 step down transformer. I will have
one side feeding my 120 volt items and the other side as a common
neutral.
My DC power supply has an input of 88 to 264 volts, so that is not a
problem. Just a couple of relays, filament transformer and blower.
I have room for the transformer as I'm building this 8877 10 meter amp
in a waist high rack cabinet.
I'm sure it will work out fine. If it doesn't, I just tie the
'downstream side' of the 120 volt item to the chassis and not tell
anyone. 8^)
When I kick your butts in some contest on 10 meters, it might be with
an amp with the neutral tied to the chassis 8^)
Seriously, thanks for the useful input.
73 de Steve, NR4M
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