Howdy. Yeah. The easiest way is to run the current through a 7 V, 5 W zener diode. That will eat up the 7 V at any current, as long as the zener power rating is not exceeded. In this case about 700 mA. If more current capacity is needed, just split the zener into two 3,5 V, 5 W in series. This should be able to handle 1,4 A. Regards.
By paralleling multiple Zener diodes, the total power capability is increased. This is achieved by dividing the total current among the diodes, reducing the power dissipation in each individual diode. Additionally, this configuration enhances thermal stability, as the heat generated by each diode is decreased, lowering the risk of damage due to excessive heat. For instance, if a 5.1V Zener diode with a power rating of 10 watts is required but only 5-watt diodes are available, two 5-watt diodes can be connected in parallel to achieve the desired 10-watt rating. This allows for the circuit to handle the necessary current🌹
The 7805 is a voltage regulator, designed to maintain a constant output voltage. To achieve constant current, you would need to introduce a resistor in series with the LED.
Dear alexandra 🌹 1. Low Efficiency: Significant power dissipation: The 7805 operates as a linear regulator, meaning it dissipates the excess voltage as heat. This can be problematic for higher input voltages and load currents. Inefficient use of power: A large portion of the input power is wasted as heat, reducing overall system efficiency. 2. High Dropout Voltage: Minimum input voltage requirement: The 7805 needs a minimum input voltage (typically 2V) higher than the output voltage (5V) to operate correctly. This limits its applicability in low-voltage systems. 3. Limited Output Current: Maximum current rating: The 7805 has a maximum output current rating, which varies depending on the specific model. Exceeding this limit can cause overheating and damage to the regulator. 4. Requires Heat Sink: Thermal management: Due to the high power dissipation, a heatsink is often necessary to prevent overheating, especially at higher input voltages and load currents. This increases the overall component count and size of the circuit. 5. Fixed Output Voltage: Limited flexibility: The 7805 provides a fixed 5V output, which might not be suitable for all applications. Adjustable voltage regulators like the LM317 offer more flexibility.
The 7805 is a classic linear voltage regulator, but it has limitations in terms of efficiency and heat dissipation. Here are some alternatives: Linear Regulators (Improved Versions) 78M05: Offers better performance than the standard 7805 with lower dropout voltage and improved thermal characteristics. LM317: Adjustable voltage regulator, providing more flexibility than fixed output voltage regulators. Switching Regulators (Higher Efficiency)❤
Linear regulators like the 7805 dissipate the excess voltage as heat. Trying to create a lower voltage will increase this heat dissipation, potentially damaging the regulator. Stability: The regulator might not operate stably at lower output voltages, leading to unpredictable behavior.🌹
Now load the output with 10 ohms, we'll see what the voltage is then (most likely 0.14V or around that)
😏
Howdy. Yeah.
The easiest way is to run the current through a 7 V, 5 W zener diode. That will eat up the 7 V at any current, as long as the zener power rating is not exceeded. In this case about 700 mA.
If more current capacity is needed, just split the zener into two 3,5 V, 5 W in series. This should be able to handle 1,4 A.
Regards.
By paralleling multiple Zener diodes, the total power capability is increased. This is achieved by dividing the total current among the diodes, reducing the power dissipation in each individual diode. Additionally, this configuration enhances thermal stability, as the heat generated by each diode is decreased, lowering the risk of damage due to excessive heat. For instance, if a 5.1V Zener diode with a power rating of 10 watts is required but only 5-watt diodes are available, two 5-watt diodes can be connected in parallel to achieve the desired 10-watt rating. This allows for the circuit to handle the necessary current🌹
@@electrofixtips Howdy.
With all due respect.
Parallelling zener diodes is a bad idea. The current split will not be even.
Best regards.
Good job man
thank u alex
Great 1:55 😊
thanks svcrafts
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good job ma n
Dear anthonny 🌹I am thrilled to hear that the video was helpful to you. Thank you for your comments!❤
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🌹
How can a 7805 be used to power an LED with a constant current?
The 7805 is a voltage regulator, designed to maintain a constant output voltage. To achieve constant current, you would need to introduce a resistor in series with the LED.
What are the limitations of using a 7805?
Dear alexandra 🌹
1. Low Efficiency:
Significant power dissipation: The 7805 operates as a linear regulator, meaning it dissipates the excess voltage as heat. This can be problematic for higher input voltages and load currents.
Inefficient use of power: A large portion of the input power is wasted as heat, reducing overall system efficiency.
2. High Dropout Voltage:
Minimum input voltage requirement: The 7805 needs a minimum input voltage (typically 2V) higher than the output voltage (5V) to operate correctly. This limits its applicability in low-voltage systems.
3. Limited Output Current:
Maximum current rating: The 7805 has a maximum output current rating, which varies depending on the specific model. Exceeding this limit can cause overheating and damage to the regulator.
4. Requires Heat Sink:
Thermal management: Due to the high power dissipation, a heatsink is often necessary to prevent overheating, especially at higher input voltages and load currents. This increases the overall component count and size of the circuit.
5. Fixed Output Voltage:
Limited flexibility: The 7805 provides a fixed 5V output, which might not be suitable for all applications. Adjustable voltage regulators like the LM317 offer more flexibility.
What alternatives are there to a 7805?
The 7805 is a classic linear voltage regulator, but it has limitations in terms of efficiency and heat dissipation. Here are some alternatives:
Linear Regulators (Improved Versions)
78M05: Offers better performance than the standard 7805 with lower dropout voltage and improved thermal characteristics.
LM317: Adjustable voltage regulator, providing more flexibility than fixed output voltage regulators.
Switching Regulators (Higher Efficiency)❤
How can a 7805 be used to create voltages less than 5 volts?
Linear regulators like the 7805 dissipate the excess voltage as heat. Trying to create a lower voltage will increase this heat dissipation, potentially damaging the regulator.
Stability: The regulator might not operate stably at lower output voltages, leading to unpredictable behavior.🌹
Is it ok for mobile charging
0:01 asmr
🤔
how to stepdawn 14 volt lithium ion battery to 5volt pls??
Use the 7805 regulator
Ada ruang pada masa depan kena kaji balik nih. Bukan sekarang.
🤔🤔
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Well done
You’re awesome!