17-08-2019, 05:46 PM
(This post was last modified: 17-08-2019, 05:53 PM by ppppenguin.)
Amie, not only do you learn fast, you also have the benefit of your late father's collection of testgear and other stuff. You'll be teaching us things soon!
If you've got a big "continental" set, Grundig or suchlike with lots of piano key controls, its mains TX may well run hot on our mains. A buck TX is an ideal way to sort that out. To buck 20V, that's 1/12 of 240V so the transfomer rating need only be 1/12 of the power consumption of the set. In other words tiny for for most sets.
The subject of isolating transformers and RCDs have been worked over heavily both here and elsehwere. Look for Mark Hennessey's contributions on the subject for a really clear exposition. If you stop to work out where and when currents can flow through your body then you'll be a long way towards staying safe. Draw out the circuits, with you as part of those circuits. Most of us here have made mistakes, sometimes rather nasty mistakes, and we know what a mains shock is like. I've had worse than that - about 1200V DC - and it £$%^&* hurt. You will make mistakes and with a very modest amount of luck you'll survive and learn the lessons. Just like we have.
If you've got a big "continental" set, Grundig or suchlike with lots of piano key controls, its mains TX may well run hot on our mains. A buck TX is an ideal way to sort that out. To buck 20V, that's 1/12 of 240V so the transfomer rating need only be 1/12 of the power consumption of the set. In other words tiny for for most sets.
The subject of isolating transformers and RCDs have been worked over heavily both here and elsehwere. Look for Mark Hennessey's contributions on the subject for a really clear exposition. If you stop to work out where and when currents can flow through your body then you'll be a long way towards staying safe. Draw out the circuits, with you as part of those circuits. Most of us here have made mistakes, sometimes rather nasty mistakes, and we know what a mains shock is like. I've had worse than that - about 1200V DC - and it £$%^&* hurt. You will make mistakes and with a very modest amount of luck you'll survive and learn the lessons. Just like we have.
www.borinsky.co.uk Jeffrey Borinsky www.becg.tv
