- #1
Vossi
- 5
- 1
Need help verifying if this circuit design and use of elements is correct. The goal here is to run a 3v motor, hence I need to make the use of voltage regulators for a constant 3v energy to transfer.
Verifying a circuit design with voltage regulators
- Thread starter Vossi
- Start date
In summary, the goal here is to run a 3v motor, so the use of voltage regulators is necessary. The motor only draws 8mA, so the use of a buck regulator for 90% efficiency is a better option.
Need help verifying if this circuit design and use of elements is correct. The goal here is to run a 3v motor, hence I need to make the use of voltage regulators for a constant 3v energy to transfer.
- #2
DaveE
Science Advisor
Gold Member
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I guess it's ok, sort of. Does your motor really only draw 8mA?
Why do you have 2 caps in series? and why are they 10F!
The diode must be a schottky for only 0.3V drop. This is ok if you choose a big one like 1N5817 et. al. But, only at room temperature and at low current (like 8mA). If it gets hot it will drop more voltage.
Why not just use a linear voltage regulator, where most of the details have been done for you. You'll get better performance with fewer parts. For example 78L33, they cost about $0.50.
Why do you have 2 caps in series? and why are they 10F!
The diode must be a schottky for only 0.3V drop. This is ok if you choose a big one like 1N5817 et. al. But, only at room temperature and at low current (like 8mA). If it gets hot it will drop more voltage.
Why not just use a linear voltage regulator, where most of the details have been done for you. You'll get better performance with fewer parts. For example 78L33, they cost about $0.50.
- #3
Baluncore
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2023 Award
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Or get a buck regulator for 90% efficiency.
https://www.ebay.com.au/itm/203108764061
https://www.ebay.com.au/itm/203108764061
- #4
Vossi
- 5
- 1
Please help calculate the voltage, current and power of all circuit elements. What is the minimum power rating required for R1 and the voltage regulator?
- #5
Rive
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Sorry, but this circuit is just insane.
For the power rating, as it is now you should just take those caps as short circuit since to charge them to 3V will take quite a time. 12V through 1kOhm => you should be able to calculate the power and the current through the (serial) diode too.
Is this some kind of homework? For a real life problem this is just too ... special.
For the power rating, as it is now you should just take those caps as short circuit since to charge them to 3V will take quite a time. 12V through 1kOhm => you should be able to calculate the power and the current through the (serial) diode too.
Is this some kind of homework? For a real life problem this is just too ... special.
Last edited:
- #6
phyzguy
Science Advisor
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One question to ask yourself is, where does that 8.7mA go after flowing through the 1 kOhm resistor?
- #7
berkeman
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+1Rive said:
@Vossi -- Your thread (well, actually your 2 threads, since you multiple posted it) is locked for Moderation. Please send me a Personal Message (PM -- click on my avatar and "Start a conversation") to let me know if this is for schoolwork or not. Thank you.
1. What is the purpose of using voltage regulators in a circuit design?
Voltage regulators are used to maintain a constant, stable output voltage regardless of changes in input voltage or load. This ensures that the circuit components receive the correct voltage for proper functioning.
2. How do you verify the performance of a voltage regulator in a circuit design?
The performance of a voltage regulator can be verified by measuring the output voltage under different load conditions and comparing it to the desired output voltage. This can be done using a multimeter or oscilloscope.
3. What factors should be considered when selecting a voltage regulator for a circuit design?
Some important factors to consider when selecting a voltage regulator include the required output voltage, maximum input voltage, maximum output current, efficiency, and package type. It is also important to ensure that the voltage regulator can handle the expected load and has appropriate protection features.
4. How do you troubleshoot issues with voltage regulators in a circuit design?
If the output voltage of a voltage regulator is not stable or is outside the desired range, it could indicate a problem with the regulator. Troubleshooting steps may include checking for proper input voltage, ensuring proper grounding, and checking for any short circuits or damaged components.
5. Are there any safety precautions to keep in mind when working with voltage regulators in a circuit design?
Yes, it is important to always follow proper safety precautions when working with voltage regulators, as they can handle high voltages. This may include wearing appropriate protective gear, working in a well-ventilated area, and using caution when handling live circuits.
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