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From: HF_ATL on 16 Jan 2010 09:05 Let's suppose I buy a receiver that has the following information: - Voltage: 7-12V DC (positive center pin) - Output Current: 245 mA but I have a transformer that has 12v DC output (regulated between 1.5 and 12V) and 500ma, 6VA max, Input 230v-50hz 12.5W. Can I use it to power the receiver safely? Thanks
From: Tom Biasi on 16 Jan 2010 09:32 "HF_ATL" <concorde93(a)gmail.com> wrote in message news:sOSdnRxOLoMvWszW4p2dnAA(a)giganews.com... > Let's suppose I buy a receiver that has the following information: > > - Voltage: 7-12V DC (positive center pin) > - Output Current: 245 mA > > but I have a transformer that has 12v DC output (regulated between 1.5 and > 12V) and 500ma, 6VA max, Input 230v-50hz 12.5W. Can I use it to power the > receiver safely? > > > Thanks > > Yes. Your spec is 12V, you have that at 245 mA you have better. Tom
From: Jamie on 16 Jan 2010 10:03 HF_ATL wrote: > Let's suppose I buy a receiver that has the following information: > > - Voltage: 7-12V DC (positive center pin) > - Output Current: 245 mA > > but I have a transformer that has 12v DC output (regulated between 1.5 and > 12V) and 500ma, 6VA max, Input 230v-50hz 12.5W. Can I use it to power the > receiver safely? > > > Thanks > > Yes. Actually, you're right on target. Its good to operate at 50% capabilities.
From: HF_ATL on 16 Jan 2010 10:47 >HF_ATL wrote: >> Let's suppose I buy a receiver that has the following information: >> >> - Voltage: 7-12V DC (positive center pin) >> - Output Current: 245 mA >> >> but I have a transformer that has 12v DC output (regulated between 1.5 and >> 12V) and 500ma, 6VA max, Input 230v-50hz 12.5W. Can I use it to power the >> receiver safely? >> >> >> Thanks >> >> >Yes. > > Actually, you're right on target. > > Its good to operate at 50% capabilities. > > > So it means that the transformer gives 500ma maximum but if the receiver only needs 245ma then only 245ma will be drained by the transformer, right? By the way, it's better to use 9v in the transformer? Since in this case I have 33,33% and 22,22% respectively for upper and lower voltage limit of operation of the receiver (7-12V dc)? Thanks for your answers! --------------------------------------- This message was sent using the sci.electronics.basics web interface on http://www.Electronics-Related.com
From: krw on 16 Jan 2010 12:07
On Sat, 16 Jan 2010 09:47:12 -0600, "HF_ATL" <concorde93(a)n_o_s_p_a_m.gmail.com> wrote: >>HF_ATL wrote: >>> Let's suppose I buy a receiver that has the following information: >>> >>> - Voltage: 7-12V DC (positive center pin) >>> - Output Current: 245 mA >>> >>> but I have a transformer that has 12v DC output (regulated between 1.5 >and >>> 12V) and 500ma, 6VA max, Input 230v-50hz 12.5W. Can I use it to power >the >>> receiver safely? >>> >>> >>> Thanks >>> >>> >>Yes. >> >> Actually, you're right on target. >> >> Its good to operate at 50% capabilities. >> >> >> > >So it means that the transformer gives 500ma maximum but if the receiver >only needs 245ma then only 245ma will be drained by the transformer, >right? Where did the 245mA number come from? >By the way, it's better to use 9v in the transformer? Since in this case I >have 33,33% and 22,22% respectively for upper and lower voltage limit of >operation of the receiver (7-12V dc)? Not necessarily. At the lower voltage the current will usually be higher. That's why I asked were the 245mA came from. Three digit precision indicates that it's not a "spec" number, rather something measured (as a side note, therefore a "nominal" number). More information please. >Thanks for your answers! > >--------------------------------------- >This message was sent using the sci.electronics.basics web interface on >http://www.Electronics-Related.com Another Usenet free-loader. |