If the current is variable, then you can use a couple of low value very high wattage resistors in the ratio of 3.8:1.2 connected in series across the 5V supply and draw off 1.2V across the smaller resistor. The current through the resistor pair must be very much higher than the current in the final load.
How do you step down voltage?
https://www.youtube.com/watch?v=m8rK9gU30v4
How do I lower my power supply voltage?
To reduce voltage in half, we simply form a voltage divider circuit between 2 resistors of equal value (for example, 2 10KΩ) resistors. To divide voltage in half, all you must do is place any 2 resistors of equal value in series and then place a jumper wire in between the resistors.
How do you reduce voltage from 5V to 2V?
the transistor level or device level? voltage divider is one of the solution to change 5V to 2V! If you design in the transistor level, you need 2 transistors act like active resistor! Use the multimeter to check the voltage from your node to the Gnd!May 7, 2004
How do I test a DC power supply with a multimeter?
Turn on your multimeter and set it to read DC voltage. Take the red (positive) probe from your multimeter and stick it into the end of the power supply plug. Take the black (negative) probe from your multimeter and carefully touch it against the barrel of the plug without touching the tip or your red probe.
How do you measure the voltage of a DC power supply?
Measuring the voltage coming off of a Power Supply Stick. Set the knob to "20V" in the DC range (the DC Voltage range has a V with a straight line next to it). Multimeters are generally not autoranging. You have to set the multimeter to a range that it can measure.
How do I check my power supply voltage?
Switch your multimeter to the range that is appropriate for reading the voltage from your power supply. If your power supply's voltage is 125 volts, switch your multimeter to read a range of 100-200 volts. Some multimeters may not offer a range, so you may need to choose the approximate voltage on a dial.
How do you troubleshoot a DC power supply?
- Plug the power supply into a wall socket and measure its DC output, noting if the output is steady or fluctuates. ...
- Unplug the power supply. ...
- Use the DMM to measure the filter's smoothing resistor's value or verify continuity if smoothing is done with an inductor.
How do I reduce 6V to 3V?
from a 50amp supply at 5 volts you'd need a dropping resistor to drop 6–3 =3 volts at 50amps. You'd need a resistor of (R=V/I) - 3/50=0.06 ohms, not an easy value to get or make.