Electronix Newbie Needs help with Transformer!!!

[Minion]

Hi Folks, I am very new to electronics and am basicly try to teach myself by doing reading and research on the net and of cource posting questions on message Boards like this one.. :grin:

Well I just bought 8 Transformers on ebay for $5 that I was thinking of useing to build power supplies...The Problem is that since I know nothing about Transformers (Accept what they do) I don"t have a Clue as to how to wire it up or even which wires are which....

The Transformer is supposed to be a 110v to 26v or a 220v to 26v Transformer and has these Markings on it:

26v OV 26v
T-201-1
OV 120V 220v

It has a red, black & Brown wire comeing out one side and a white, yellow & blue wire comeing out the other side....

I assume that one wire on one side is for 110v operation and the other is for 220v operation and the third wire is maybe the negitive lead for both/either voltage??
And I also assume then that on the other side one wire is for 26v from 110v and the other is 26v from 220v and the Third wire is the Negitive lead for both/either voltage??

Here is a Picture of the Transformer:

So could someone tell me which wires do i use for 110v to 26v??

I was also wondering if I connected up the 220v to 26v but ran it on 110v would I get 13v?? and If I can do this is there also a way that I can run both 26v and 13v at the same time??

I was also wondering If I can safely use a 15v Voltage regulator to get the 26v down to 15v if I put a Heatsink on the regulator??

I think that is about all the questions I have in this area at this Time but I"m sure I will have many more in the Future....

ThanX a Lot !!! You Guys/Galls are Great!!

 

[adamasd]

You have a 52 volt center tapped transformer, which is like two 26 Volt transformers. The legend on top lines up with wires. On the primary, 110/220 volt side, the white and yellow wires go to the wall. 0 and 110 volt. On the secondary the black is the center tap with red and grey being 26 volts from the center tap. So you can use the grey and red wires with the black to ground to get 52 volts or use the black and either the red or the grey to get 26 volts.

adam

 

[Minion]

Thanx For your Answer but I am not exactly understanding what you are Saying....

So you say that the "White" and Yellow" wires Plug into the Wall for 110v operation?? Right?

So which one is the Negitive and Positive lead??

So If I wanted to get 52v I would set the "Black" to "Ground" and use the Red and say the Positive and the Brown as Negitive??

Is that Right??

So to get 26V I would just use the Black wire as the Nehitive and the Red as Positive and the Brown as Ground??


If I run this Transformer wired up in 220v Mode but Plugged it into a 110v Wall socket could I expect to get 26v Center Tapped and 13v as the secondary?? I think this Should work because the Transformer just works on Ratios so I should be able to get Half the Power when feeding the Transformer half the Power???

ThanX

PS: Can I get the Transformer to feed 2 Voltages at once Like 52v and 26v??

 

[alk509]

[quote author="Minion"]So you say that the "White" and Yellow" wires Plug into the Wall for 110v operation?? Right?[/quote]

It looks like that's right.

[quote author="Minion"]So which one is the Negitive and Positive lead??[/quote]

Transformers are AC devices. That is, the polarity of each wire is constantly changing, so it doesn't matter which way around you plug stuff to the wall.

[quote author="Minion"] So If I wanted to get 52v I would set the "Black" to "Ground" and use the Red and say the Positive and the Brown as Negitive??

Is that Right??[/quote]

No. You leave the black lead unconnected, and take your 52V from the brown(gray?) and red leads.

[quote author="Minion"]So to get 26V I would just use the Black wire as the Nehitive and the Red as Positive and the Brown as Ground??[/quote]

No. You get 26V from the black to any of the other two secondary leads, leaving the third lead unconnected.

[quote author="Minion"]If I run this Transformer wired up in 220v Mode but Plugged it into a 110v Wall socket could I expect to get 26v Center Tapped and 13v as the secondary??[/quote]

26V CT, or 13V-0V-13V.

[quote author="Minion"]I think this Should work because the Transformer just works on Ratios so I should be able to get Half the Power when feeding the Transformer half the Power???[/quote]

Actually, power is proportional to the square of the voltage: P=V^2/R, so if you cut the voltage in half and leave the load the same you have P=(V/2)^2/R=V^2/4R). So half the voltage is one quarter the power.

Those transformers look awful small... What are you trying to power with them?

Peace,
Al.

 

[PRR]

> which one is the Negitive and Positive lead??

Transformers only handle AC, Alternating Current.

If you think you need Plus and Minus power, you want DC, which needs another step.

 

[adamasd]

No. You leave the black lead unconnected, and take your 52V from the brown(gray?) and red leads.

whoops, Thankfully I am not the only person here.

adam

 

[Minion]

Thanx Guys, I get it now....

Concerning the 220v if you say that I will get 1/4 the power if I use it with 110v I can still get 13v if I hook it up to put out 52v?? Right?

I will be use a Bridge Rectifier to convert these to DC Power and some Filter caps to smooth out the Ripple and a Voltage Regulator to Regulate the Voltage...I am hopeing I can regulate the 26v down to 18v or 15v without too much of a Heat problem.....

I will be useing these to Power small Pre-amps ,I think the Transformers are rated at 1 amp which should be Plenty to Run a couple Channels of pre-amp....

ThanX a Lot Guys...


PS: Is there a Way I get get 2 voltages at the same Time from this Transformer Like 2 X 26v or 26v + 13v or 52v and 26 or 13v ect???