# voltage regulator +/-

Discussion in 'General Science & Technology' started by cato, Jan 4, 2006.

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5. ### leopoldValued Senior Member

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17,455
yes that is the right kind of pot

edit
remember that one side of the pot is wired opposite the other
that is when the pot is turned fully clockwise one side will produce max plus volts the other max minus volts

the way you have it now both sides produce the same voltage

since the h bridge was submitted by metakron you need his input on the following
the groud needs to return to the minus side of your supply
or it needs to return to the transformer centertap in that case your transformer needs to output 30 vac
l

Last edited: Jan 16, 2006
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7. ### leopoldValued Senior Member

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question
does this have anything to do with the questions you are asking in the computer forum
just curious

8. ### MetaKronRegistered Senior Member

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5,502
Sorry, no, that is not the right kind of pot. A stereo volume control will be audio taper, not linear taper. You have to have linear taper. The schematic looks correct.

11. ### leopoldValued Senior Member

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check radio shack and ask for a linear taper dual ganged pot

12. ### leopoldValued Senior Member

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cato
this is the size of pot to get, 10k or 1M

13. ### MetaKronRegistered Senior Member

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5,502
The ground is just the negative side of the power supply.

the pots are connected correctly. The "x" thing is where those wires cross without connecting.

14. ### leopoldValued Senior Member

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17,455
on your schematic
the left side pot
take the connection to + and change it to -
on the other end of the same side change it from - to +

if you look at my first tinycad schematic you will know what to do

15. ### leopoldValued Senior Member

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17,455
i disagree
the op amps are getting the same and equal voltage as connected.

16. ### MetaKronRegistered Senior Member

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5,502
Anything 10k to 1 Meg I can guarantee will work.

Leopold, I think we're just going to have to make a note that one potentiometer is wired backwards to the other.

Cato, you can combine parts for the order. They say 7 dollars shipping and handling but they don't say that there is a weight or size limit for regular shipping which may take about a week to get to places in the U.S. and Canada. I think when you order enough they pick up the extra shipping. It's all in their "shipping info" on the site.

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19. ### leopoldValued Senior Member

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erase the diagonal line between the two pots
on the right pot connect the bottom to +
connect the top of the left pot to +

remember that your rectifiers will drop approx 1.5 volts
the voltage drop of the inducter will be detirmined by it's dc resisence
also the voltage drop of a saturated transister will not be zero
the voltage at the output of the inductor will be
approx. 0.7xpeak rectifier output

all four of those must be considered when buying your transformer

you also said that you wanted to fuse the circuit
i would fuse the primary
the primary power will approx.= the secondary power
make sure the fuse is slo-blo or it will blow every time you turn on the supply

here is a site for ohms law formulas
http://www.angelfire.com/pa/baconbacon/page2.html

here is a site for various circuit designs
http://users.pandora.be/educypedia/electronics/analogmis.htm

power supply design sites
http://my.integritynet.com.au/purdic/power1.html
http://www.national.com/appinfo/power/

Last edited: Jan 18, 2006

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21. ### leopoldValued Senior Member

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17,455
yes that should hook you up

goodluck and godspeed

22. ### MetaKronRegistered Senior Member

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5,502
Just to be very, very technical, the negative side of the power supply needs to be explicitly attached to the ground bus. It looks like it's ready.

Last edited: Jan 22, 2006
23. ### catoless hate, more scienceRegistered Senior Member

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yeah, I was going to do that, but I distracted by other mods =]

anyway, do you know how to simulate something like this in a SPICE program? I have PSpice and another SPICE program (multisim, I think). is it possible to simulate a potentiometer? like user controlled? or would I have to simply replace the pot with different resistances to get an idea of what is going on?

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