# One way power supply

Discussion in 'General Electronics Chat' started by lubnaan90, Jan 19, 2012.

1. ### lubnaan90 Thread Starter Active Member

Jan 13, 2010
196
2

Here is a very basic query about power supply in electronics.

If suppose i have three different LED lighting circuits (all three circuits are 555 based), all three circuits require a power supply (PS) of 12volt DC (1amp), i just have one 12volt (8amp) battery and I would like to power all three lighting circuits with this single 12volt battery. Powering all the three circuits parallely with one 12 volt battery doesn't seem to be working, the lighting circuits work but with abnormal behavior, the circuit doesn't lit up the LEDs as it is designed to do, If i am not mistaken it seems it is because of the reverse current.

So, What shall i do, i mean how do i create a ONE WAY POWER SUPPLY for each circuit? Do i need to add some component at the PS input of each circuit to avoid reverse current, so that all three circuits can work properly even by sharing the same PS.

Any wise advises & recommendations will be deeply appreciated.
Thank You.

Best Regards.
Lubnaan90

Last edited: Jan 19, 2012
2. ### mcgyvr AAC Fanatic!

Oct 15, 2009
4,787
973
Post a schematic

3. ### lubnaan90 Thread Starter Active Member

Jan 13, 2010
196
2
I am sorry i dont have the scheme of the circuit boards, but i can mention that all the three circuit boards are 555 based (LED flasher boards).

4. ### thatoneguy AAC Fanatic!

Feb 19, 2009
6,357
718
Are you trying to wire them in series?

Hook the + of the battery to the - of each board, one at a time to make sure that board works.

Once you verify all 3 boards work, tie the + of the battery to the + of all 3 boards, and the - of the battery to the - of all three boards.

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5. ### praondevou AAC Fanatic!

Jul 9, 2011
2,936
489
You may have the problem described here in post #3:

If all circuits work iwhen connected to the power supply individually and start showing strange behaviour when connected together you may need to decouple the circuits.

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