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In Reply to: RE: Losses posted by Paul Joppa on August 04, 2014 at 15:43:15
Hi PaulI want to put a bit of capacitance across the secondary of the first transformer for filtering, so I want to use lower voltages in the < 25v or so range. I'm using trans. with 15v secondaries mainly because I have them on hand.
Ok, I'm a little electronically challenged. Are you saying that given my application, a trans rated at 300VA would really be safe only to a 1/4 of that? i.e 75VA?
I don't think that would be an issue for me as I will be using a Seduction and a Smash, but it's good to know for the future. I'll make sure I fuse it accordingly.
Regards
cleet
Edits: 08/04/14Follow Ups:
It will be perfectly safe with your original plan, it's just that if you try to draw the full 150VA per output, the available voltage will sag significantly.
In most cases, the available power line voltage exceeds the nominal 120v specification, so this may or may not be an actual problem. It is certainly not a problem with low current draw such as you propose!
I understand. Thanks for your response Paul.
I currently have a similar device, two transformer with balanced and on the outputs I a couple of cap - 100uh INDUCTOR - cap. My little seduction absolutely just loves this beyond words. Things are coming out of my vinyl collection that I ahve just never ever heard.
I have a question. If I filter mains with a cap-inductor-cap, what type of cap will work best? Would a mylar cap be a good choice? I used ceramic caps I it sounded better with them out the circuit.
And I do know that on unfused mains one needs to use only main certified caps (X2 and Y2) and nothing else, but I am talking a fused unit and the cap-inductor-cap behind a transformer. So no worries I'm going to burn my house down! :-)
thanks
Cleet
For an RFI filter, you want low ESR even at high frequencies, hence ceramic, mica, or polypropylene. Keep the portion of the cap leads that is shared between input and the choke as short as possible, approximating a "four-pole" cap.
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