![]() ![]() Carefully observe the circuit board and replace concerned output filter capaciors with same value electrolytic capacitors, but have near-double dc voltage rating. The smps can be safely run without the cooling fan for low power tests. The cooling fan may also have to be removed or disconnected. The smps I’ve hacked is built around a TL494 IC for the PWM but IC KA7500 is a drop in equivalent of the TL494 IC, so if your smps uses one of these in its pulse-width modulation (PWM) circuitry, you are in good luck.įirst, remove the circuit board from the smps cabinet. Fortunately, it is possible to increase the dc output levels of the smps with some advanced tricks. Often, dc output voltage higher than 12V (for instance 13.8V) is required for some lab experiments. Besides, two LEDs (LED1&LED2) are used to indicate the power supply status. The push button switch (S1) in the circuit is a “luxury” power on/off switch. The add-on board can be constructed on a small piece of veroboard/custom-built circuit board, using a handful of inexpensive components. Next is to extend required power supply lines from the 20/24-pin smps output connector to the addon board, as shown in the circuit diagram. (ATX smps 20-pin power supply connector pinout)
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |