voltage regulator +/-

Status
Not open for further replies.
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:
question
does this have anything to do with the questions you are asking in the computer forum
just curious
 
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.

This page has several dual linear taper potentiometers. They have no minimum order and a $7 shipping and handling charge. They are a pretty good source for the rest of the components, too. You may have to dig for the mounting hardware for the potentiometer, though. It may come without it.
 
cato said:
heh, sorry, I exported the picture of a wire rather than the whole circuit =/

its fixed now
http://www.killerkittykats.net/quik/cato/Tinycad h-bridge3.png
Click to expand...
metakron
are the pots connected correctly in this diagram?

and where does the ground connect to? the minus side of the supply or the center tap?

sorry about the pot i should have known audio when i seen stereo. duh

the pot connections and the ground connection doesnt seem right

you said one op amp is fed the inverse of the other
the way the pots are connected they both get the same polarity and voltage

also the ground doesn't connect anywhere
 
Last edited:
question
does this have anything to do with the questions you are asking in the computer forum
just curious
Click to expand...
nope, no connection.

I am not sure about the wiring of the POT, that was the part I was unclear with before. I will look at it. (help from would be nice there =])

I was going to connect the grounds back to the neg side of the bridge rectifier, but I could do either. I just left it as a ground symbol because I didn't want so many wires crossing there.

do you guys know any where I might get a pot without ordering it online, I don't want to spend $7 for a cheap part like that. do they combine shipping on orders of many parts? because it would be worth the shipping if I buy all the parts there.
 
MetaKron said:
One must be wired backwards to the other. Use at least 5k, 10k is better, and it will work just fine with 1 megohms.
Click to expand...
cato
this is the size of pot to get, 10k or 1M
 
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.
 
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
 
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.
 
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:
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?
 
Status
Not open for further replies.
Back
Top