# Two 4 kinds ±5~15V fixed power.

Discussion in 'The Projects Forum' started by ScottWang, Sep 3, 2013.

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1. ### ScottWang Thread Starter Moderator

Aug 23, 2012
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2 sets and 4 kinds ±5~15V fixed dual power supplies.

This is a two separated fixed positive and negative dual power supplies : this power has been used for over 18 years (before 1995)

1) Vout +5V, 0V, -5V, The maximum current around 870 mA/dc when I used 1.4A transformer.

2) Vout +15V, +12V, +9V, 0V, -9V, -12V, -15V, The maximum current around 500 mA, when I used 0.8A transformer, about the ±10V, that's used two sets of three 1N4007 diodes connected in series to the ±12V.

3) The 78xx, 79xx series, generally the input voltage must be greater than the output voltage 2.5V or more, to obtain a stable output voltage, in this case was used 3V.

4) The inputs of 7809,7812 can be connected to the input of 7815.

5) The inputs of 7909,7912 can be connected to the input of 7915.

6) There are no name and no number on the transformer, the labeled on the circuit diagram was created by me.

If you only using a single power supply, because the two power supplies are independently, so it can be obtained many different voltages when they through a cascaded method.

1) The values of voltage can be combined as 3,5,6,8,9,10,11,12,13,14,15,17,18,19,20,21,23,24,25,26,27,28, 29,30,31,32,34,35,37,40 volts.

2) Usually the ground terminal of two power supplies, they were connected together by an external wire and became a common ground, if need for other purposes then they can be seperated.

This power is used the standard voltage regulator IC , as 78xx and 79xx, so it is very convenient, the wiring is very simple, I was took a universal board soldered the parts directly, and in the practical application also very extensive, such as TTL, CMOS, OP AMP, general experimental of transistor circuits, etc..., it can be competent.

The arrangements of actually output terminal can be seen on the panel as below, I didn't using the power LED indicators in the beginning, but I added the positive power LED indicators later, I also reserved the negtive power LED indicators.

When you watching the circuit, if you find the circuit has disconnection phenomenon, that is the browser or screen or computer software caused that, there is no problem in the circuit, if you using ACDSEE or other graphics softwares to see then it will be normal.

▼01-The circuit diagram of the Power Supplies.

▼02-The appearance of Power Supply.

▼03. Front Panel.

▼ 04. The internal structure A:?± 5V rectifier, filter, 7805, 7905 IC regulator board - parts side.

▼ 05. The internal structure B:?± 5V rectifier, filter, 7805, 7905 IC regulator board - solder side.

▼ 06. The internal structure C:?plus and minus ±9V, ±12V, ±15V rectifier, filter,? 7809, 7812, 7815, 7909, 7912, 7915 IC regulator board.

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• ###### 5-15V06-InternalStructureC.jpg
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Last edited: Sep 3, 2013
2. ### Georacer Moderator

Nov 25, 2009
5,142
1,266
Did you include documentation in the post? It doesn't seem to be visible.

3. ### ScottWang Thread Starter Moderator

Aug 23, 2012
4,855
767
The original thread has some problem, it make me can't edit this thread, so please delete this thread and I will post another new one.

I am using the same way to post the picture as attach, there are no any problems on the other forums on this site, but I don't know why when I post on this forum got the problem.

4. ### Georacer Moderator

Nov 25, 2009
5,142
1,266
You don't need to create a new thread. Just edit the first post of this thread.
Are you able to do that?

If you need to create a new thread for the same purpose, please create it in this sub-forum first.

5. ### ScottWang Thread Starter Moderator

Aug 23, 2012
4,855
767
I already created the new one, so now if any Moderator delete the new one, then I will edit this thread, if delete this thread then I don't need to edit again.

I edited the pictures, now is normal.

Last edited: Sep 3, 2013

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