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power supply

e67

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Jul 7, 2022
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This DC power supply is the cheap kind that switches between voltage and current by turning the dials in a certain way...
I don't use it for current but am curious about something....You get the voltage screen at first by turning the current knob a little bit... and then you set the voltage for charging...but if you want to maximize the current do you continue to increase the current knob until the screen turns back to current and max it to the right for max current at your already selected voltage??
These units are popular so someone here probably knows here....look at the pic..its the Longwei 10 amp 30 volt charger..they are about 30$..20240219_141819.jpg
 
This DC power supply is the cheap kind that switches between voltage and current by turning the dials in a certain way...
I don't use it for current but am curious about something....You get the voltage screen at first by turning the current knob a little bit... and then you set the voltage for charging...but if you want to maximize the current do you continue to increase the current knob until the screen turns back to current and max it to the right for max current at your already selected voltage??
These units are popular so someone here probably knows here....look at the pic..its the Longwei 10 amp 30 volt charger..they are about 30$..

I have that or a very similar unit.

To measure voltage, current must be non-0 as even a voltage measurement requires >0A. It appears this unit must be SET for >0A to simply adjust the voltage.

You can max out current as you describe, or you can short the leads together and set the current to the desired amount.
 
and when I max out the current on the current knob the voltage will stay to what I put it at??
that's important..
 
and when I max out the current on the current knob the voltage will stay to what I put it at??
that's important..
If you set the voltage with an open circuit (leads attached to nothing) and then don't move the voltage dial, the unit won't exceed that voltage regardless of what you do with current dial.
Think of those two dials as setting Voltage to not exceed, and current to not exceed.
 
If you set the voltage with an open circuit (leads attached to nothing) and then don't move the voltage dial, the unit won't exceed that voltage regardless of what you do with current dial.
Think of those two dials as setting Voltage to not exceed, and current to not exceed.

agreed. This is the intended outcome, but with cheap equipment, don't be surprised if the values drift a little.
 
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