3 and 6 volt supply - Electronic Circuits Projects Diagrams Free

1Steveo · 25th January 2004, 02:25 PM

Can I center tap a 4 cell battery to get a 3 volt supply for one circut, and also still use the 6volts for another circut?

Thanks
steveo

evandude · 25th January 2004, 02:43 PM

**Nigel Goodwin** · 25th January 2004, 03:10 PM

Yes you can, but it's very bad practice!.

bogdanfirst · 25th January 2004, 03:40 PM

you can do this, if you have a battery that has 2/4 elements.
but this is not good because the first half, the one that powers the 3V will discharge faster. so it is not a good way.
you could use a voltage regulator and get 3V from the 6V. this way all the battery is discharged at the same time.

1Steveo · 25th January 2004, 04:22 PM

What I trying to do is power a PIC micro an a motion dector off the same battery pack. Also use 1 of the microcontroler's output pin for a switch to VSS.
Im trying to get away from using a "optocupler" to keep the circut simple as possable.

What do you think?

Steve

elec_lover · 25th January 2004, 07:40 PM

Be careful, if you connect circuits together with different power supplies.
I most case they need the same grounding. So you must see it as a whole
circuit. Also the voltage to the input of an integrate circuit may higher than there power supply of the IC itself..

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25th January 2004, 02:25 PM	(permalink)
1Steveo	3 and 6 volt supply Can I center tap a 4 cell battery to get a 3 volt supply for one circut, and also still use the 6volts for another circut? Thanks steveo

25th January 2004, 03:10 PM	(permalink)
Nigel Goodwin	Yes you can, but it's very bad practice!.

25th January 2004, 03:40 PM	(permalink)
bogdanfirst	you can do this, if you have a battery that has 2/4 elements. but this is not good because the first half, the one that powers the 3V will discharge faster. so it is not a good way. you could use a voltage regulator and get 3V from the 6V. this way all the battery is discharged at the same time.

25th January 2004, 04:22 PM	(permalink)
1Steveo	What I trying to do is power a PIC micro an a motion dector off the same battery pack. Also use 1 of the microcontroler's output pin for a switch to VSS. Im trying to get away from using a "optocupler" to keep the circut simple as possable. What do you think? Steve

25th January 2004, 07:40 PM	(permalink)
elec_lover	Be careful, if you connect circuits together with different power supplies. I most case they need the same grounding. So you must see it as a whole circuit. Also the voltage to the input of an integrate circuit may higher than there power supply of the IC itself..