115/230V voltage switch key for transformer?
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From: Joerg on 25 Nov 2009 11:52 petrus bitbyter wrote: > <osr(a)uakron.edu> schreef in bericht > news:f664eb19-4b19-4565-b198-87d60393c2a8(a)j19g2000yqk.googlegroups.com... > On Nov 24, 8:48 pm, Joerg <inva...(a)invalid.invalid> wrote: >> Hello Folks, >> >> Never needed this before but now I do: What are those things called that >> you unplug and insert 180 degrees rotated to switch the primaries of a >> transformer between 115V operation (parallel) and 230V operation >> (series)? Circuit board mount. >> >> Or better yet, does anyone know a source? Must be super cheap, as in >> <<50c altogether in qties, as usual :-) >> >> Under categories such as "voltage selector" I only found fuse holders >> with this feature in there, really expensive plus way too large. I want >> to avoid a slide switch because someone could accidentally hit it and >> ... *PHUT* >> >> -- >> Regards, Joerg >> >> http://www.analogconsultants.com/ >> >> "gmail" domain blocked because of excessive spam. >> Use another domain or send PM. > > | The classic term used in Marshall and other Audio Amps is voltage > | selector plug. > | > | Somebody decided they should be removed from the electrical code. Your > | left with the voltage selecting fuseholders. try schurter. > | > | Steve > | > > FAIK that old method does not meet current EU safety regulations anymore. So > that selectors became obsolete. > > Why a slide switch will not do? You can find voltage selector slide switches > in which the slider is burried so deeply it can only be operated by a small > screwdriver or something like that. Sliding it accidentaly seems next to > impossible. > Not that easy anymore. Slide switches often don't have the respective agency ratings and since they are primary side they must. Also, it is very hard to find any that are rated 260V which is required for countries such as the UK. -- Regards, Joerg http://www.analogconsultants.com/ "gmail" domain blocked because of excessive spam. Use another domain or send PM.
From: Joerg on 25 Nov 2009 11:54 Rich Grise wrote: > On Tue, 24 Nov 2009 17:48:09 -0800, Joerg wrote: > >> Hello Folks, >> >> Never needed this before but now I do: What are those things called that >> you unplug and insert 180 degrees rotated to switch the primaries of a >> transformer between 115V operation (parallel) and 230V operation (series)? >> Circuit board mount. >> >> Or better yet, does anyone know a source? Must be super cheap, as in <<50c >> altogether in qties, as usual :-) >> >> Under categories such as "voltage selector" I only found fuse holders with >> this feature in there, really expensive plus way too large. I want to >> avoid a slide switch because someone could accidentally hit it and ... >> *PHUT* > > Jumper? > Very much against code, usually. Unless it's a wire jumper but my client wants to avoid having to open the units every time an order comes in for the "wrong" voltage. -- Regards, Joerg http://www.analogconsultants.com/ "gmail" domain blocked because of excessive spam. Use another domain or send PM.
From: Jan Panteltje on 25 Nov 2009 12:16 On a sunny day (Wed, 25 Nov 2009 08:54:06 -0800) it happened Joerg <invalid(a)invalid.invalid> wrote in <7n55pkF3k6kfaU3(a)mid.individual.net>: >> Jumper? >> > >Very much against code, usually. Unless it's a wire jumper but my client >wants to avoid having to open the units every time an order comes in for >the "wrong" voltage. Solution: Pyrotechnics. Use several wire jumpers, and have 2 hidden set of contacts to blow the right ones before shipping. :-)
From: osr on 25 Nov 2009 13:14 Yeah, the ON circuit is crude, and the SCRs in series are a failure point. But its a start. And from a safety point of view, its got to be more of a hazard then a properly made jumper. Kinda my point. I take it this is on a linear for noise or cost reasons? Steve
From: Joerg on 25 Nov 2009 13:25
osr(a)uakron.edu wrote: > Yeah, the ON circuit is crude, and the SCRs in series are a failure > point. But its a start. > And from a safety point of view, its got to be more of a hazard then a > properly made jumper. > Kinda my point. > > I take it this is on a linear for noise or cost reasons? > Two reasons. The cost of transformers is remarkably low, around five bucks for 10-15VA. Can't beat that with a switcher, even considering your own PWM stuff behind it because that only adds a buck or two. Then, temperature. Beats me but all the places I've called won't endorse more than 50C or 60C for their switcher modules and that's just not going to fly. For some reason my own designs never had such limits but I can't justify the NRE for all the agency testing on this one if we rolled our own mains-connected switcher. The only 250V-rated selectors I see are panel mount and insanely expensive, such as this one: http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=0033.1118-ND -- Regards, Joerg http://www.analogconsultants.com/ "gmail" domain blocked because of excessive spam. Use another domain or send PM. |