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My newly built power supply is blowing fuses.
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coppercone2:
i would just increase their value if your worried
Jay_Diddy_B:
Hi,

To the original poster.

The schematic shows a transformer that is 0-18 and 0-18. This is two independent windings.
This is different than a 18-0-18 transformer.

The 0-18 transformer will give an output voltage of 18 x 1.41 = 25V

The maximum voltage on the diodes is also 25V

You need to determine if your transformer has two independent windings or is center tapped.

Regards,

Jay_Diddy_B
Hextejas:

--- Quote from: Jay_Diddy_B on December 31, 2018, 11:09:52 pm ---Hi,

To the original poster.

The schematic shows a transformer that is 0-18 and 0-18. This is two independent windings.
This is different than a 18-0-18 transformer.

The 0-18 transformer will give an output voltage of 18 x 1.41 = 25V

The maximum voltage on the diodes is also 25V

You need to determine if your transformer has two independent windings or is center tapped.

Regards,

Jay_Diddy_B

--- End quote ---
Jay, please explain more. The schematic has 18-0-18 printed above the symbol for the xformer so is there something in the wiring that says different ? You have me even more confused.
wraper:

--- Quote from: Hextejas on January 01, 2019, 01:04:49 pm ---Jay, please explain more. The schematic has 18-0-18 printed above the symbol for the xformer so is there something in the wiring that says different ? You have me even more confused.

--- End quote ---
18-0-18 means single winding with center tap, not 2 independent windings. When using transformer with center tap, you should connect center tap to GND and use single rectifier. The only way using existing PCB with center tap transformer would be removing 4 diodes and connecting like I shown on the picture.



info:
This looks like the power supply circuitbasics is using. Build an input current limiter circuit (search is your friend) or for testing, use a lightbulb in series with the transformer on the primary side

https://youtu.be/Gj5KlGOdUqA?t=896
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