The general idea of a separation transformer is very sound! Especially when building the amp and for initial commissioning you can't do better. And it doesn't have t be too expensive. You really don'
I can in principle concur with your 3 salient points here Manfred. However, as I said in a recent post an amateur / ham could consider doing such an abominable thing in a one-off homebrew project; bu
Don't be so sure guys! Did anybody notice the shiny brand new electronic arc welders- portable as it comes- now all the rage? They're transformerless and sold all over the world. Like somebody alread
One thing to be stressed is: RFI/EMC issues have NOTHING to do with the existence of the input transformer. All equipment is required to have RF bypassing at the mains input. That's been true since b
I know it and I know the guy. We collaborated when he designed it. It well designed and based on a military module that was used for EW. Very reliable and well behaved. Alex 4Z5KS ORIGINAL MESSAGE: (
Guys' you remind me of the clip that used to run on the 'net a few years ago: a guy in India that climbed on the roof of a train wagon' lost balance and grabbed the wire to steady himself. What do we
I'll tell you! Back in the nineties at Tadiran we designed for the Navy a switching power supply based on a PFC IC the rationale was that in order to correct the power factor, it had first to make it
Yes! First of all, there is not so much of a difference between a transformer power supply and a PFC: the both are based on an inductive input element- a transformer primary here, and a series induct
For god's sake guys! Why complicate? Do what power supply people did for 40 years when working on offline power supplies: disconnect the scope's ground wire and stand on a rubber mat. The scope trans
Guys: Let's make one thing clear: in our present culture, when suing is so prevalent, you're in danger whenever you leave the house. it's definitely possible to use a separation transformer during th
My my ... That's what we used to call cycloconverters during the steam era. It good to know there are still relics from my time in use, at least conceptually. Alex 4Z5KS A quick note to all those who
Children: Did anyone hear about the rubber mat we were talking about at the beginning of this thread??? Alex Bill, you are missing the main point here! Yes, sure! But if you then connect the scope to
....Manfred I have to hand it to you: the last lines are the most important of this discussion. Not enough hams to roast any.... Guys remember: we wre playng with 3000 volts and we're still alive. We
And what about the transformers on the input and output of the amplifier board? Don't they qualify as such? I'll tell you even some more: the American standard of safety is more concerned with the fi
Point taken but the principle is still valid Alex 4Z5KS --Original Message-- From: Amps [mailto:amps-bounces@contesting.com] On Behalf Of donroden@hiwaay.net Sent: Monday, October 07, 2013 6:06 PM To
Every thing is all right but , please don't insult the floor!!! Alex 4Z5KS /*snip*/ conductive. /*snip*/ A friend asked me to test the vinyl jacket on common RG-8/U to see how good an insulator it is
Manfred, send me please the link to your site. It's been ages since I've been there. Alex 4Z5KS Manfred, you are absolute right, it was stupid of me to state "all". Never say never! Some specific ele
At some time in the past tube amplifiers enjoyed an effect dubbed the 3/2 law. It had something to do with causing higher order IMD products to increase slower than the mathematics predicted. The net
...try this end too http://www.cmi-ferrite.com/ Alex 4Z5KS ORIGINAL MESSAGE: (may be snipped) REPLY: According to Amidon's recommendations, 73 material is best below 15 MHz: http://www.amidoncorp.com
It's quite close to the Eimac 3-1000 except for the lousy amplification factor which will be a handicap from the drive requirements standpoint. The -1000v is nothing just a design limit; in normal op