dual power supply design

Sound like you need to make say +/-5V rails and hang a power opamp between them that can source/sink 200mA. Voltage control or current control can be had.

As always, you need to state what you are starting with, and your specific goal. Yes, most things are possible, but the means to the end depends on the specifics.

Maybe give this a try lad

Always works wonders for me!

Kirk Johnson "Stretching Specialist"

EEWWWW.....

Rough and ready; unsophisticated!

1) Find a design for a power supply of around four to five volts. With a centre tap. 2) And there are other circuits that can be arranged from a transformer without a centre tap that can also provide plus and minus supplies from the same winding. With a 'virtual' centre tap or zero voltage point. 3) A pot placed across the two outputs can be adjusted to anywhere from plus 2 to to minus 2 volts; relative to the centre tap of item (1) or the created zero of item (2). 4) For two separate outputs use two separate pots arranged thus. As a guess you prob. need power supplies providing an amp or more and then 'sink' some of it in the pots. Depending on whether the 200 m/a is a steady or varying load? All depends what you are trying design/do!

:Hello, : :does anyone know if there's any way to design a simple low power dual :power supply? The result should be able to swing between -2V and 2V :(for example, the values are not important just giving an idea of the :range) and supply around.... 200mA (again just an idea... around here :somewhere). : :The output of the power supply should (ideally) consist of two wires :that I can swing between +/- 2V. I'm open to any type of control... :I'm guessing it will end up being a pot, although voltage control or :current control would be nice... however, that is not really what I'm :trying to figure out right now. : :I'm just wondering if someone can point me in the right direction :here... I'm having a hard time trying to figure out where to begin :with this design. : :much thanks!

I don't know exactly what you hope to achieve by being able to "swing between

-ve and +ve" using "two wires".

One of the output wires has to be the nominal reference or common wire which means that the other wire must be able to ramp up to some +ve value when rotating a potentometer in one direction. Alternatively, this wire will also be able to ramp down to some -ve value by rotating the pot in the other direction.

Is this what you mean?

Usually, a power supply is used for a specific purpose and if it is required to be voltage adjustable, then its output range is between the value of 0V to some

+ve maximum, OR from 0V to some -ve maximum on another wire which is referenced to the 0V wire, ie. the output wire can go no lower than 0V referenced to the 0V or common wire.

How much of a consideration is efficiency, and what power does it need to run on? Does it produce +2V and -2V at the same time, or do you need to swing it end to end?

If it's AC, I'd use a transformer to reduce line power to about 10V peak to peak, center tapped, to ground, rectify it on both sides to get

+5V and -5V, filter to get the ripple down to under a volt and then use a power op-amp with variable gain off a voltage reference to get the output voltage.

? ISN'T THAT A SONG ?

I AM PROTEUS