Hello, Yasin!
It is great to hear that the LM317/TIP35C project worked well for you.
Regarding your questions about the ferrite toroid (Material CF199, AL=11350 nH) for the SMPS project:

1. L1 (EMI Filter): Yes, you can use it. The CF199 is a high-permeability ferrite material, which is excellent for Common Mode Chokes (EMI filters).
Since L1 is designed to block high-frequency noise from returning to the power grid, high inductance is desirable.
Turns: About 15 to 20 turns of bifilar winding (two wires wound together) will provide a very high inductance, which is great for filtering.
Wire Gauge: Since the input current (at 220V) for a 140W supply is relatively low (around 1A to 1.5A), you can use 20 AWG (0.8mm) wire.

2. L2 (Output Filter): NO, do not use this core. This is the most important part.
The core you have is a high-permeability ferrite with no air gap. In an output filter (L2), the inductor must handle 10A of DC current.
The Problem: High-permeability ferrites (like CF199 with AL=11350) saturate almost instantly when DC current is applied. Once saturated, the inductance drops to near zero, which could cause the output ripple to skyrocket or even damage the output capacitors and MOSFETs.
Recommendation for L2: For the output filter at 10A, you should use an Iron Powder Core (typically Yellow/White, Material -26, or Blue/Green, Material -52) or a Gapped Ferrite EE Core.
An Iron Powder core like the T106-26 or T130-26 is ideal for this.

3. Wire Gauge for 10A (Output side): To handle 10A safely and reduce skin effect losses:
Use a total cross-section of at least 2.5mm² to 3mm².
Instead of one single thick wire (which is hard to wind), I recommend using 3 or 4 strands of 20 AWG (0.8mm) wire in parallel.
This will be much more efficient at the switching frequency of the IR2153.

Best regards and happy building!

I have recently discovered your work and I am writing to you from Turkey.

First of all, I would like to thank you for your “1.2V–37V 20A Adjustable Power Supply using LM317 and TIP35C” project. I have successfully built it using your PCB design, and it works perfectly.

Now, I am planning to build your “13.8V 10A SMPS Power Supply using IR2153 and IRF840” project. However, I have a question regarding the inductors. For the coils, I have the following core in my inventory:

Type: Ferrite Toroid Ring (EE/Toroid)

Material: CF199

Inductance Factor (AL): 11350 nH

Dimensions: 31.50mm (OD) x 19.00mm (ID) x 21.20mm (H)

Can I use these cores for the L1 (EMI Filter) and L2 (Output Filter) in your circuit? If so, what should be the wire gauge (thickness) and the number of turns for a 10A output?

Thank you in advance for your assistance.

Best regards,

Hello Pavel!I’m sorry to hear that the previous builds didn’t work out as expected.
Electronics can be tricky, and sometimes the smallest detail makes all the difference! Let’s try to figure this out together.
What input voltage are you using in your setup?Technically, this circuit has an internal voltage drop of approximately 2.5V to 3V due to the transistor configuration and the operational limits of the UA741.
If you are using a 12V source at the input, the battery will unfortunately never reach a full charge. To overcome this ‘barrier’, you really need at least 16V to 18V DC at the input (P1).
Also, please make sure your TIP35C is mounted on a large heatsink, as it can get quite hot during the process.If you could share the specs of your power supply or a photo of your build, I’d be happy to take a closer look for you.
We’ll get it working!
Best regards!

Hello Pavel!I’m sorry to hear that the previous builds didn’t work out as expected.
Electronics can be tricky, and sometimes the smallest detail makes all the difference! Let’s try to figure this out together.
What input voltage are you using in your setup?Technically, this circuit has an internal voltage drop of approximately 2.5V to 3V due to the transistor configuration and the operational limits of the UA741.
If you are using a 12V source at the input, the battery will unfortunately never reach a full charge. To overcome this ‘barrier’, you really need at least 16V to 18V DC at the input (P1).
Also, please make sure your TIP35C is mounted on a large heatsink, as it can get quite hot during the process.If you could share the specs of your power supply or a photo of your build, I’d be happy to take a closer look for you.
We’ll get it working!
Best regards!