Is my Power Supply Circuit correct in the recreated version?

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Discussion Overview

The discussion revolves around the correctness of a recreated power supply circuit designed using Livewire and PCB wizard. Participants are examining the circuit's components, connections, and overall functionality, focusing on aspects such as voltage regulators, bridge rectifiers, and fuse placement.

Discussion Character

  • Homework-related
  • Technical explanation
  • Debate/contested

Main Points Raised

  • The original poster is uncertain about the correctness of their circuit recreation and notes a lack of voltage in the current.
  • Some participants observe that the potentiometers (pots) are incorrectly connected and that the fuse is misplaced.
  • There are suggestions that a pair of bridge rectifiers may be needed for each side of the power supply, with one for the positive regulator and another for the negative regulator.
  • Questions arise regarding the use of a transformer, with one participant mentioning a step-down transformer that provides 25V input.
  • Concerns are raised about the configuration of the voltage regulators, with specific mention of incorrect connections between output and reference pins, as well as the need to reconfigure resistor values.
  • Participants recommend searching for schematics of dual regulated power supplies for better guidance.

Areas of Agreement / Disagreement

Participants express multiple competing views regarding the circuit's configuration, with no consensus reached on the correctness of the original design or the proposed corrections.

Contextual Notes

Limitations include potential misunderstandings of component connections and the need for further clarification on the circuit's architecture and specifications.

AilingLore21
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Homework Statement


So the circuit drawing is in this link http://i.imgur.com/jVYm5La.jpg . Basically, we have to create a power supply circuit and using Livewire and PCB wizard program in conjunction, I created this circuit

Homework Equations


None?

The Attempt at a Solution



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I can't seem to know exactly if this is correct or wrong when I recreate this using the program. I tried using the Play function in Livewire and the green current seems to have no Voltage. I'm also wondering if I misplaced some polarity of the Voltage regulators there.

Sorry, I'm a bit new to using these programs
 
Last edited by a moderator:
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A couple of observations: Your pots are not correctly connected. F1 is not serving any purpose.
 
Looks like the fuse is in the wrong place.

I think you will need a pair of bridge rectifiers—one for each side of the power supply.

Are you going to use a transformer between the 220V and your rectifier?
 
NascentOxygen said:
Looks like the fuse is in the wrong place.

I think you will need a pair of bridge rectifiers—one for each side of the power supply.

Are you going to use a transformer between the 220V and your rectifier?
I completely forgot though, the transformer is a step-down one so the input would only be 25V

Edit: How about the Voltage regulators? Is there something wrong with it?
 
Last edited:
NascentOxygen said:
I think you will need a pair of bridge rectifiers—one for each side of the power supply.
By this I mean one bridge rectifier for the positive regulator, and a second bridge rectifier for the negative regulator.

I think you should search on google for a few schematics of a dual regulated power supply, and model your circuit on those.
 
The output terminals (both of them) are connected to the wrong spot.

I second the suggestion by @NascentOxygen about a Google search for schematics.

Although your basic circuit architecture can work in some conditions, please consider using a transformer with a Center Tapped secondary or two individual secondaries.
 
Last edited:
AilingLore21 said:
Edit: How about the Voltage regulators? Is there something wrong with it?
Yes, very. You're mixing up the output vs. ref pins and then the circuit needs to be still further reconfigured (basically R1 ⇔ R2 and R3 ⇔R4 value-wise). Look more carefully at how the lm317 is supposed to be hooked up. Same with the lm337. As in here http://www.ti.com/lit/ds/symlink/lm317.pdf
 

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