Schematic for Power Supply V1: A PCB for a power supply with a 5V,...

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polo280

@copilot are there any issues in this project?

copilot

Let's review the project to ensure that everything is in order and connected properly.

Summary of Your Project Components

Resistor (R1)
- Resistance: 500
Capacitors (C1, C2)
Adjustable Output Pin (ADJOUT)
Potentiometer (POT, POT , POT-)
Input Power (Vin)
Voltage Regulator (U1)

Nets

Ground (GND)
Net 2 [Vin to U1: IN]
Net 3 [C2: P1, ADJOUT: P1, R1: P2, U1: OUT]
Net 4 [R1: P1]
Net 5 [C1: P2, U1: ADJ, ADJ: P1]

Preliminary Issues to Address

Capacitance Values for Capacitors (C1, C2): Make sure to specify the capacitance values.
Pin Terminal Order and Pin Numbers for Custom Pins (P2, POT, POT , POT-, P1): Ensure these are specified correctly for accurate design and manufacturing.

Connections

Let's verify the connections based on typical usage for a voltage regulator circuit:

Standard Voltage Regulator Configuration with LM350K

Input Power (Vin):
- Connect Vin to U1:IN.
Ground (GND):
- Connect C1 to GND.
- Connect C2 to GND.
- Ensure LM350K has a proper ground connection if required.
Connection for Resistor and Capacitor:
- Connect R1 to U1:OUT.
- Connect R1 to C2, ADJOUT.
- Connect C1 to U1:ADJ.
Adjust Pin Configuration:
- Connect ADJ to C1, U1:ADJ.

Miscellaneous

Ensure that nets marked as "Exclude from BOM" or "Exclude from PCB" are correctly set if not needed.
Make sure all connections that must be made for the voltage regulator to function correctly are in place.

Recommendations:

Verify all component values and connections.
Once the above is validated, proceed with proper testing and breadboarding if required.

Please review the above suggestions, and let me know if any corrections or additional details are needed!

How do i connect the lm350k in my circuit if i want to build an adjustable volta...

polo280

@copilot How do i connect the lm350k in my circuit if i want to build an adjustable voltage source?

copilot

To build an adjustable voltage source using the LM350K STEEL/NOPB, you'll need a few additional components:

Two resistors (let's assume R1 and R2).
An input voltage source.
A capacitor for stabilization (optional but recommended, let's assume C1 and C2).

Here's a basic guideline on how to connect these components:

Input Voltage:
- Connect your input voltage source (let's assume 24V DC) to $U1:IN$ .
Ground:
- Connect the ground of the input voltage source to $U1:ADJ$ and one side of $R2$ .
Output Voltage:
- Connect $U1:OUT$ to the output terminal, where you will take the adjusted voltage.
Resistor Divider:
- Connect $R1$ between $U1:OUT$ and $U1:ADJ$ .
- Connect the other end of $R2$ to ground.
Optional Capacitors for Stability:
- Connect $C1$ across $U1:IN$ and ground.
- Connect $C2$ across $U1:OUT$ and ground.

Detailed Connections:

Connect the input voltage source (e.g., 24V DC) positive to $U1:IN$ .
Connect the input voltage source negative to ground.
Connect $U1:IN$ to $C1$ positive terminal and $C1$ negative terminal to ground.
Connect $U1:OUT$ to the output terminal and $R1$ pin 1.
Connect $R1$ pin 2 to $U1:ADJ$ .
Connect $R2$ pin 1 to $U1:ADJ$ , and $R2$ pin 2 to ground.
Connect $U1:OUT$ to $C2$ positive terminal and $C2$ negative terminal to ground.

Schematic Summary:

Connect input voltage positive to $U1:IN$ .
Connect input voltage negative to ground.
Connect $C1$ between $U1:IN$ and ground.
Connect $U1:OUT$ to $R1$ pin 1, $C2$ positive terminal, and the output.
Connect $R1$ pin 2 to $U1:ADJ$ .
Connect $R2$ pin 1 to $U1:ADJ$ , and $R2$ pin 2 to ground.
Connect $C2$ between $U1:OUT$ and ground.

You can adjust the output voltage by changing the values of

R1

and

R2

according to the formula:

V_{out} = V_{ref} \left(1 + \frac{R1}{R2}\right) + I_{adj}R1

Where

V_{ref} \approx 1.25V

. For simplicity, you can usually ignore the

I_{adj}

term if

R1

is not too large.

polo280

I want to do it with a potentiometer to adjust the voltage

copilot

Using a potentiometer simplifies the adjustment process. You can replace one of the resistors in the voltage divider with a potentiometer.

Required Components:

One fixed resistor (let's assume $R_1$).
One potentiometer (let's assume $POT_1$).
Capacitors for stabilization (optional but recommended, let's assume $C_1$ and $C_2$).

Connections:

Input Voltage:
- Connect your input voltage source (let's assume 24V DC) to $U_1: IN$.
Ground:
- Connect the ground of the input voltage source to $U_1: ADJ$ and one side of the potentiometer $POT_1$.
Output Voltage:
- Connect $U_1: OUT$ to the output terminal.
Resistor Divider:
- Connect $R_1$ between $U_1: OUT$ and the wiper (middle pin) of $POT_1$.
- Connect one end of $POT_1$ to ground.
Optional Capacitors for Stability:
- Connect $C_1$ across $U_1: IN$ and ground.
- Connect $C_2$ across $U_1: OUT$ and ground.

Detailed Connections:

Connect the input voltage source (e.g., 24V DC) positive to $U_1: IN$.
Connect the input voltage source negative to ground.
Connect $U_1: IN$ to $C_1$ positive terminal and $C_1$ negative terminal to ground.
Connect $U_1: OUT$ to the output terminal and $R_1$ pin 1.
Connect $R_1$ pin 2 to the wiper (middle pin) of $POT_1$.
Connect one end of $POT_1$ to $U_1: ADJ$ and the other end to ground.
Connect $U_1: OUT$ to $C_2$ positive terminal and $C_2$ negative terminal to ground.

Schematic Summary:

Connect input voltage positive to $U_1: IN$.
Connect input voltage negative to ground.
Connect $C_1$ between $U_1: IN$ and ground.
Connect $U_1: OUT$ to the output terminal and $R_1$ pin 1.
Connect $R_1$ pin 2 to the wiper (middle pin) of $POT_1$.
Connect one end of $POT_1$ to $U_1: ADJ$ and the other end to ground.
Connect $C_2$ between $U_1: OUT$ and ground.

By adjusting the potentiometer ($POT_1$), you can vary the voltage output from the LM350K STEEL/NOPB as needed.

polo280

If id like to reduce ripple should i add a diode and where?

copilot

Adding a diode primarily helps with reverse voltage protection rather than reducing ripple. To reduce ripple, you'd typically use capacitors and possibly inductors in more advanced designs. However, if you want to add a diode for protection while controlling ripple, here's how you can include it:

Components:

One fixed resistor (let's assume $R_1$).
One potentiometer (let's assume $POT_1$).
Three capacitors for stabilization and ripple reduction (let's assume $C_1$, $C_2$, and $C_3$).
One diode (let's assume $D_1$).

Connections with Diode for Protection and Ripple Reduction:

Input Voltage:
- Connect your input voltage source (let's assume 24V DC) to $U_1: IN$ through $D_1$.
Ground:
- Connect the ground of the input voltage source to the ground plane.
Output Voltage:
- Connect $U_1: OUT$ to the output terminal.
Resistor Divider:
- Connect $R_1$ between $U_1: OUT$ and the wiper (middle pin) of $POT_1$.
- Connect one end of $POT_1$ to ground.
Optional Capacitors for Stability and Ripple Reduction:
- Connect $C_1$ across $U_1: IN$ and ground.
- Connect $C_2$ across $U_1: OUT$ and ground.
- Connect $C_3$ across $U_1: ADJ$ and ground.

Detailed Connections:

Connect the input voltage source (e.g., 24V DC) positive to $D_1$ anode.
Connect $D_1$ cathode to $U_1: IN$.
Connect the input voltage source negative to ground.
Connect $U_1: IN$ to $C_1$ positive terminal and $C_1$ negative terminal to ground.
Connect $U_1: OUT$ to the output terminal and $R_1$ pin 1.
Connect $R_1$ pin 2 to the wiper (middle pin) of $POT_1$.
Connect one end of $POT_1$ to $U_1: ADJ$ and the other end to ground.
Connect $U_1: OUT$ to $C_2$ positive terminal and $C_2$ negative terminal to ground.
Connect $C_3$ between $U_1: ADJ$ and ground.

Schematic Summary:

Connect input voltage positive to $D_1$ anode.
Connect $D_1$ cathode to $U_1: IN$.
Connect input voltage negative to ground.
Connect $C_1$ between $U_1: IN$ and ground.
Connect $U_1: OUT$ to the output terminal and $R_1$ pin 1.
Connect $R_1$ pin 2 to the wiper (middle pin) of $POT_1$.
Connect one end of $POT_1$ to $U_1: ADJ$ and the other end to ground.
Connect $C_2$ between $U_1: OUT$ and ground.
Connect $C_3$ between $U_1: ADJ$ and ground.

Explanation:

Diode ($D_1$): Protects against reverse voltage.
Capacitors:
- $C_1$: Reduces input ripple.
- $C_2$: Reduces output ripple.
- $C_3$: Stabilizes the adjust pin to ground.

If you need further ripple reduction, you can consider adding more filtering stages with inductors and capacitors, forming LC filters.

12VOUT

Capacitance

0.1u F

L7812

Capacitance

0.33u F

Vin

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	Designator	Ruleset
	＊｀REF｀＊	Override rule for ＊｀REF｀＊
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	＊｀REF｀＊	Override rule for ＊｀REF｀＊
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	Designator	MPN
	R1	None

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Ground
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Power Net Portal
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15.1k
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RMCF0805JT47K0
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Power Supply V1

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