HELP! can any one get me a 300w psu wiring/testing diagram
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I can't; but, I am curious as to whay one would need such a thing with good power supplies as cheap as they are.
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Ummm I appreciate that a car battery has a large capacity but wouldnt drawing that much power for a sustained period drop its output voltage farly quickly.
Its just an idea but would a good invertor run off the battery be better? I dont know if an invertor can maintain the output voltage as the input voltage drops
Its just an idea but would a good invertor run off the battery be better? I dont know if an invertor can maintain the output voltage as the input voltage drops
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Jay
Plukaduk you have 2 threads about this going. You will get better answers if you stick to just one of them. In the other thread there is an answer that is actually a very good one for what youwant to do. that is to pick up a power inverter and use that. That way should you desire to take your computer out of the car and use it in a house for instance you wont have to replace the powersupply to do so. It was suggested that a 200 watt unit will suffice. I would go with a 600watt unit if I were you. One thing that you might think about though. Desk Top PC's are not designed to operate in a dynanmic environment the way a lap top is. So you will be prone to vibration and physical shock damage more so than with a lap top. So you definitely want to plan for this type of situation.
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The problem with running a 12-volt power supply unit from a 12-volt battery is that your output voltage cannot be greater than the input voltage unless the input voltage oscillates sufficiently to run a step-up transformer/circuit.
Step-up circuits are very sophisticated and there is absolutely nothing inside a computer's power supply that can be modified to do this without cannibalizing the unit--rendering useless its function as a power supply.
The input voltages to the devices inside the computer are all 12-volt and down. What you need is something that will step down the car battery's voltage to the voltages required by the main board. Your attempt at doing it by modifying the power supply's circuitry indicates to me that you have no technical expertise at such a task or you would know that it cannot be done.
What makes the power supply work is the ocillating current from the 110-volt wall outlet. You cannot get that from a flat signal (battery) without an inverter (oscillating step-up circuit)
There is a way to do this with a battery and no ocillation by using voltage regulator ICs; but, you would not be able to run it for long because the battery would very soon drop below 12 volts--unless it were being constantly charged.
If it were to be accomplished, it would be better done by starting with two, twelve-volt batteries wired in series for twenty-four volts total. That way, it would be quite some time before the batteries dropped below twelve volts total.
Using this method, you could then simply set up several voltage regulator ICs (integrated circuit transistors) to put out the desired voltage. These are easy circuits to build; but you will need several of them. It has been quite some time since I built such circuits; but, if by memory serves me right, you will need several TO-3 power transistors and maybe a few TO-220's. You'll also need a conglomeration of low-tolerance resistors and maybe a few POTs.
If you don't know what these things are nor how to make them work, teaching you here would be too large a task. It requires an education, not a how-to sheet.
Step-up circuits are very sophisticated and there is absolutely nothing inside a computer's power supply that can be modified to do this without cannibalizing the unit--rendering useless its function as a power supply.
The input voltages to the devices inside the computer are all 12-volt and down. What you need is something that will step down the car battery's voltage to the voltages required by the main board. Your attempt at doing it by modifying the power supply's circuitry indicates to me that you have no technical expertise at such a task or you would know that it cannot be done.
What makes the power supply work is the ocillating current from the 110-volt wall outlet. You cannot get that from a flat signal (battery) without an inverter (oscillating step-up circuit)
There is a way to do this with a battery and no ocillation by using voltage regulator ICs; but, you would not be able to run it for long because the battery would very soon drop below 12 volts--unless it were being constantly charged.
If it were to be accomplished, it would be better done by starting with two, twelve-volt batteries wired in series for twenty-four volts total. That way, it would be quite some time before the batteries dropped below twelve volts total.
Using this method, you could then simply set up several voltage regulator ICs (integrated circuit transistors) to put out the desired voltage. These are easy circuits to build; but you will need several of them. It has been quite some time since I built such circuits; but, if by memory serves me right, you will need several TO-3 power transistors and maybe a few TO-220's. You'll also need a conglomeration of low-tolerance resistors and maybe a few POTs.
If you don't know what these things are nor how to make them work, teaching you here would be too large a task. It requires an education, not a how-to sheet.
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