what is ATX?
The most well known power supplies of a high current low voltage are AT or ATX supplies from computers. Their disadvantage is a poorly regulated output voltage and often a need to load both of the two main outputs (5 and 12V) at the same time. Therefore, I present a simple modification of an AT or ATX PC power supply to an adjustable battery charger 3 - 15V with a short circuit protection. proper regulation and an output current corresponding to the original 12V output. The voltage feedback is connected to pin 1 of TL494 control chip (or its equivalent KA7500, KIA494, DBL494 ...). The reference voltage is 2.5 V (i.e. the circuit regulates the output voltage so that the voltage of the resistive divider is 2.5 V). Originally the feedback is connected to both 5 and 12V outputs and it works well only when both outputs are loaded. After this modification, the feedback is only connected to the 12V output. A potentiometer regulates the voltage from 3 to 15 V. The potentiometer can be replaced by a fixed resistor to set a constant voltage if needed
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#batterycharger #charger #12v #powersupply #atx #smps