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auAlan
New Member
Australia
1 Posts |
 Posted - Jul 27 2009 : 8:38:56 PM
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Hi, Just discovered this website & forum and am very impressed. I'm not much of an electronics wiz (as my backgrounds mechanical) but can follow most schematics. I have been looking for a schematic that shows how to vary the voltage AND amps. I like your simple 1.2-30V 5amp power supply which I intend to construct however there is no adjustment for amps. I would like a schematic with a potentiometer for volts and a potentiometer for amps, I will also be fitting a meter for volts and a meter for amps. I would like the voltage to range between say 3 to 30VDC and similar with the amps. Is this possible? Is there a schematic already availble that I could use by changing the values of the components?
Many thanks in advance, Alan. |
I'm contemplating procrastinating! |
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homik
Apprentece
USA
9 Posts |
Posted - Aug 03 2009 : 9:00:40 PM
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| Um... anyone is free to correct me if i'm wrong, but i'm 99% sure that the amperage depends on how much current a circuit draws. So technically you can't "control" amperage from a power supply, it depends on what you're hooking it up to. |
"I make my circuits on bread board." "Well, i print out my own PCB templates." "Oh yeah? I make my circuits with a sharpie and a cool hat." |
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wasssup1990
Nobel Prize Winner
A Land Down Under
2261 Posts |
Posted - Aug 03 2009 : 10:46:00 PM
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quote:
Originally posted by homik
Um... anyone is free to correct me if i'm wrong, but i'm 99% sure that the amperage depends on how much current a circuit draws. So technically you can't "control" amperage from a power supply, it depends on what you're hooking it up to.
You are partially correct.
You can get power supplies that have variable voltage and a current limiter.
Like this one: http://www.electronickits.com/kit/complete/powe/Mastech%20HY%203005D%20Bench%20DC%20Power%20Supply.htm |
When one person suffers from a delusion it is called insanity.
When many people suffer from a delusion it is called religion. |
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audioguru
Nobel Prize Winner
Canada
4218 Posts |
Posted - Aug 04 2009 : 08:33:47 AM
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The power supply with a variable current regulator regulates the current by reducing its output voltage until the current is what you want. If the load tries to draw more current then the voltage is reduced more. If the load tries to draw less current then the voltage is increased up to a limit set by the voltage control.
They usually have an indicator light that warns you that the current regulator is adjusting the voltage. |
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milosman
New Member
USA
1 Posts |
Posted - Aug 25 2009 : 12:04:32 AM
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Hello, New here myself and am new to electronics as well,, though we all live with them daily as for "AUallen"s question" I too was looking for schematics to such a powersupply. Seems if they have um to but already made,,,we should be able to make um,,,,if we are at the right place looking for the anserw. Right? Here is one I am currently looking for,,, A schematic to make a AC signal wave generator "FunctionGenerator capability but AC not DC,, have those already in PWMs and FG I just finished building, Guess though not sure, it would go along the lines of a AC FlipFlop? Anyone out there wana take this one?
Thanxs Ed "milosman" "thats me!"yeddi yeddie yeddie |
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HOW DO I CONTROL AMPS?
