outlet not grounded causing Monitor display problems

[vanwatson]

Different outlets at different houses or buildings cause arcade monitors to have different display problems.

Changing a linear power supply to a switching power supply it help this issue?

What kind of power supply can I use to fix this issue?

Do I need a power conditioner unit to clean up the AC line outlet signal before plugging in an Arcade game into?

[grantspain]

normally its all earth related,moving lines on the screen or a wave

mains filter just deal with any noise but very wise to fit,and again very wise to fit a modern switch mode as they have built in safety and filter components-as long as your game board will run of course on the supply of course

[vanwatson]

What is the difference between using a linear power supply to using a switching power supply? the display is cleaner and sharper?

[grantspain]

What is the difference between using a linear power supply to using a switching power supply? the display is cleaner and sharper?

no difference in display,switch mode are safer to use-if you get a short on a switch mode they shut down,on a linear supply it will either blow the fuse or the component at fault

[vanwatson]

I have noticed when adjusting the +5 volts higher then 5.2 VDC it will blow the power supply fuses, any reason why?

Does changing the AC line filter unit do anything?

[grantspain]

i am not sure why the fuses are blowing unless they are rated incorrectly

ac filter either work or do not,normally when they go faulty they go open circuit

what is the actual machine you have,i.e what game board are you running

[vanwatson]

I'm just asking in general, I read a manual that said when you would adjust the +5 volts higher than 5.2vdc it will blow the rated fuses, I'm guessing for linear power supplies it when you adjust the voltage higher the current goes higher too? switching power supplies when you adjust the voltage higher the current is current limited?

Also I see these external Series Pass transistors on heat sinks mounted on the wall cabinet. What does these series pass transistors do?

why would you need need series pass power transistors? i have seen series pass transistors but these are power transistors

I'm guessing they used series pass power transistors is because for arcade games the wattage is higher and needs higher current at 11amps for 5 volts?

 

[ed12]

series pass is a current booster

ed

[vanwatson]

series pass is a current booster

Yes i know, because most arcade games are either 5VDC at 5 amps or 5VDC at 11amps

Also the current limiting circuits in linear power supplies is different than the current limiting circuit in a switching power supply right?

[ed12]

correct

ed

[lilshawn]

"Foldback" is a current limiting feature (overload protection) of power supplies and power amplifiers. When the load attempts to draw overcurrent from the supply, foldback reduces both the output voltage and current to well below the normal operating limits. Under a short circuit, where the output voltage has reduced to zero, the current is typically limited to a small fraction of the maximum current.

SMPS uses a feedback loop from the output back to the input side of the SMPS. If the supply exits normal operating limits, the driving circuit shuts off the supply. after a short rest period, the supply will attempt to restart.

[vanwatson]

So it is true for Linear power supplies when you adjust the +5vdc it raises the current amps output also?

On switching power supplies when you adjust the +5 volts it "doesn't" raise the current amps output?

[lilshawn]

So it is true for Linear power supplies when you adjust the +5vdc it raises the current amps output also?

On switching power supplies when you adjust the +5 volts it "doesn't" raise the current amps output?

An SMPS by design outputs (or tries to) the maximum current the supply is designed to. If you have a circuit that requires low current for it to function (IE LED's) even if you have the voltage down at an acceptable level, it will try to push as much current through as possible.

This is why we must use "dropper" resistors when powering LED's. otherwise the SMPS would just blast as much current through the circuit as it can, blowing the LED in the process. (because LED's are operated mainly by the CURRENT flowing through them rather than VOLTAGE)

A linear supply output is garnered mainly by it's design and has an internal resistance attached to its design (transformer windings, diodes, etc.). Depending on it's design and how it regulates said output depends on how it reacts to certain loads. Mainly it's output is garnered by the ratio of the number of turns the transformer has between it's output and input it's outputs (after filtering) are regulated to it's final output by what regulator IC's are chosen. (1 amp 2 amps 5 amps etc.)