Can I Use A 12V Power Supply On A 19V?

Can I Use A 12V Power Supply On A 19V?

There are many cautions when using a 12V power supply on a 19V because the required voltage is way lower than the supplying voltage. So it is not recommended because the device’s interior part’s life span can be reduced severely with time when used at a lower voltage.

So in this article, we dive deeply to answer the question “Can I use a 12V power supply on a 19V?” with all the relevant information you need to know. So stick around until the end to find out what you’ve been looking for. Welcome to RLC Talk.

Can you use a 12v power supply on a 19v?

If you have one, the simplest solution is to plug it in and check it out, but I can’t absolutely guarantee that it will be secure to do so (probably is).

Most logic circuits operate at voltages below 5V. The 19V input is likely transformed into a number of different voltages for various screen circuits, possibly using DC-DC circuitry, but it’s also possible that some of it just uses simple regulators (which just waste the excess voltage).

With a regulator, as long as your input voltage is sufficient to produce the output voltage, everything should work as it should. However, with a DC-DC converter, if the input voltage drops, the current will need to increase to make up for it. 

Either will operate over a variety of voltages, but you can’t just assume that 12V is sufficient; if it were, they’d have provided a 12V supply in the first place.

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Can you use a 12V power supply on a 9V device?

Direct damage to the motor will result from the winding insulation being destroyed by the voltage. However, you can use it in a two-way

Can I Use A 12V Power Supply On A 19V?
  1. The first method involves connecting a series resistor to the motor as shown in the following figure. 

By knowing the motor’s wattage, you can determine its current rate using the formula Ir = Power / Voltage, and you can use this current to choose the resistor’s value by understanding that the voltage drop is equal to the voltage difference between the source and the load (V.D=12—9=3).

The value of the resistor (V.D/Ir) is equal to the voltage difference/rated current. 

  1. The second method involves using a transformer if the motor is an AC motor or a Buck converter if it is a DC motor.

Can you use a 12v adapter for 6v?

Depending on the nature of the device. The voltage probably won’t be an issue if the device has its own internal switching regulator, but since the 12V power supply has a lower maximum power (12V * 0.35A = 4.2W, compared to 6V * 1A = 6W), it may draw too much power and damage the power supply.

Can I Use A 12V Power Supply On A 19V?
Can you use a 12v adapter for 6v?

The fact that the 12v supply can only deliver a smaller current does not preclude it from causing harm; rather, it is the voltage that will cause harm and dissolve the semiconductors’ dielectric gate oxide.

These devices are voltage-driven rather than current-driven, which means that to power them up, we apply a constant voltage, and they were made with the assumption that this voltage would be used. 

All bets are off and who knows what will happen if you apply a different voltage than what it was intended for; however, the likelihood is that it will be damaged.

The maximum current it can drive when necessary is indicated by the current rating. For instance, if your device needed 6V and drank 1A, you could connect a 6V/100000A supply and everything would work out just fine. 

The supply has a lot more current capacity than is required, but it can only push out 1A because that is the amount of current that your device needs. The supply voltage starts to drop out if your device uses more power than the supply can provide.

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Can you use a 12v power supply on a 5v?

It is likely that the device will burn out. Additionally, connecting a 12V supply to a device rated for 5V maximum could result in a risk, such as fire or explosion, depending on the nature of the device and the 12V supply’s capacity.

The voltage produced by the majority of wall adaptors is unregulated, which means that it varies depending on the load. The voltage for a “5V” adaptor under light load could reach 12 or 15 V.

Because of this, internal voltage regulators are a common feature of devices made to operate off inexpensive wall adapters in order to safeguard the electronics.

A 6V or 9V adaptor will work if you are certain the original PSU was unregulated (as long as the polarity is right and the PSU is powerful enough – mA high enough). The voltage regulator will have to do more work as a result of the PSU’s higher output voltage; additionally, because the regulator’s heatsink was made for the original PSU, it may overheat.


Don’t use it, please! The load will likely be harmed by the 19V that the PSU will supply (“voltage source”). 

There are PSUs that limit output current by lowering/regulating the output voltage (which is then a “current source”), but that wouldn’t work either if the required current wasn’t constant.

Most devices are made to operate at a specific voltage and sink current in accordance with their task. For instance, your TV will use little current when it is in standby mode but a lot more when the display is on.

The power rating of “35W” only indicates how much power it can produce; however, at higher voltages, the load is likely to draw more current. Higher voltage and more current translate into much higher power, which could completely destroy the load.

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Some related FAQs.

Can I run 5V LED on 12V?

A 5V LED must not be run on 12V.

Can I supply a 12V to 5V relay?

The relay board will undoubtedly be damaged by 12V. With both relays activated, this 2-channel relay board needs about 200 mA at 5 volts. The simplest solution, I suppose, would be to drop the voltage to 5.2V using a 5W, 6.8V Zener diode connected in series with 12V.

How do I amplify 5V to 12V?

A pull-up resistor and an open-collector output should raise a 5V signal to 12V. You can convert your output to an open-collector output by using an NPN transistor (along with a base resistor).

Can you get shocked by 5V?

5 volts is entirely secure. Your body has a resistance of about 100 kOhm, especially across your heart, which is the area that matters the most for electrical safety. 50 microamps, which is not even enough to feel, will be flowing across you at 5 volts.

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