[TechAssist] Re: Re Mr Ohms turning in his grave 220Volts?????? SHOCKED!!!!!
- From: Jorge Camboni <geo@xxxxxxxxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Thu, 19 Dec 2002 15:52:09 -0600
Hi techs.
We are supposed to be talking about real sets, not about
a fixed impedance. If a set requires 4 amps at 120 volts,
it will require 2 amps at 240 for a determined 480 W power
drain. IT IS PAINFULLY OBVIOUS THAT THE POWER
SUPPLY DESIGN IS DIFFERENT FROM 120 TO 220/240
unless it is a universal switching power supply which
stands a wide range of voltages on the chopper transistor
collector. Other designs, I recall some vcrs use a doubler
for 120 and a straight full or half wave for 220.
If you double the voltage on a fixed load, you' ll end up
with 4 times the power drain (w=e2/r) but that makes no sense
By the way a chopper's transistor collector IS NOT a fixed load,
I mean a switching power supply's behavoir depends on the
load and the input voltage...
240V requires much lighter wiring, on the other hand,
it is much more dangerous.
you all have a pleasant day
Jorge Camboni, GY Electronics, Dallas/Richardson
At 09:48 a.m. 19/12/02 -0800, gulftech@xxxxxxxx wrote:
>Dear Villy,
>
>Most of us know that formula as P = IE. Since current is directly
>proportional to voltage ( I = E/R), an increase in voltage yields a
>corresponding increase in current with R held constant. If current and
>voltage are both doubled, power is increased by a factor of 4.
>
>If I'm wrong, please set me straight.
>
>Regards,
>
>
>Ken Smith
>Gulf Technical Services
>3034 Gulf Breeze Parkway
>Gulf Breeze, FL 32563
>850-934-8324 (Voice) 850-932-0819 (Fax)
>
>
>On Thu, 19 Dec 2002 11:03:37 0000 "Vilhelm Boor" <villyboor@xxxxxxxxx>
>writes:
> >
> > Villy boor
> > Boorelec Durban
> > When I read some of this I am rather surprised, where were some of
> > you trained, what happened to Ohms law? Why 2 round prongs. Most
> > countries use various combinations of flat pin at various angles,
> > Round pins tended to have a bakelite body.
> > But please remember W=IV so the greater V is the less I will be so
> > cables are lighter, plugs can be smaller and fuses lower I. Philips
> > for example make a wide range of TV with an input requirement of
> > from 90V to 270V, just plug it in and its working. I am sometimes
> > left speechless, this is your subject and livlihood, you must know
> > basics.
> > On Wed, 18 Dec 2002 19:43:29
> > teltek2 wrote:
> > >
> > >No...Their 220 does not requite a huge plug like your dryer..just 2
> > round
> > >prongs.
> > >
> > >-Ed-
> > >Tel-Tek Electronics
> > >Ontario-Canada
> > >
> > >teltek2@xxxxxxxxxxxx
> > >----- Original Message -----
> > >From: "Electric Medic" <info@xxxxxxxxxxxxxxxxx>
> > >To: <techassist@xxxxxxxxxxxxx>
> > >Sent: Wednesday, December 18, 2002 7:24 PM
> > >Subject: [TechAssist] Re: RCA CTC187AD 220Volts?????? SHOCKED!!!!!
> > >
> > >
> > >>
> > >> I am showing my ignorance here as well. I was not aware that a
> > CTC187AD
> > >> would work on 220v. Is that a overseas chassis? I think I have
> > worked on
> > >> many CTC187AD's, I know I have worked on many CTC187's. This is
> > shocking
> > >> news. Maybe all CTC187's work on 220v. Is the power cord special.
> > It
> > >should
> > >> be huge according to my dryer's plug. Does it have two power
> > cords, one
> > >for
> > >> 115v and one for 220v? This is the biggest news I have heard in a
> > long
> > >time.
> > >> I never knew this, I am shocked.
> > >>
> > >> Perry
> > >> www.electricmedic.com
> > >>
> > >> -----Original Message-----
> > >> From: Philip Bader [mailto:tjanphyl@xxxxxxxxxxxxxxx]
> > >> Sent: Wednesday, December 18, 2002 8:55 AM
> > >> To: tv-repair@xxxxxxxxxxxxxxx
> > >> Subject: Re: [tv-repair] RCA CTC187AD / C27521 whine
> > >>
> > >>
> > >> I am showing my ignorance here, but is this set designed for dual
> > line
> > >> voltages?
> > >> If so, I would concentrate on the small electrolytics around the
> > >> smps(STK regulator caps) for a start.Last, did you use the correct
> > >> suffix # for the STK? (Was original a -090?)
> > >> Phil Bader
> > >>
> > >> "Brian Dorset " wrote:
> > >> >
> > >> > Hello All
> > >> > Just replace regulator (stk730-090) and CR4106 for a dead
> > set
> > >> > symtom. Now it works find except when you plug it into 220V,
> > turn on,
> > >> > then turn it off, you will get an annoying squeal from the power
> > >> > supply. Squeal will go away when power is on and return when
> > set is
> > >> > off. Set does not do that on 120V. Any suggestion will be
> > >> > appreciated .
> > >> >
> > >> > Brian Dorset
> > >> > Brian's Electronix Services
> > >> > Mt Grenan Village
> > >> > St Vincent.West Indies.
> > >> > TEL: 784-458-9847
> > >> > FAX: 784-458-9847
> > >> > E-mail: bes@xxxxxxxxxxxxx
> > >> >
> > >> >
> > >>
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