Did you look at the datasheet for the AZ431 that I posted a link to earlier?I have two SD431 and the circuit is different from what SgtWookie has posted. I am unable to find the data sheet for SD431. Can someone help me in identifying the pins?
A quick search didn't turn up any schematics, but you might get lucky if you keep looking.I have Suntek Switching Power Supply***Model NO: AM607BS. Is is possible to get the circuit diagram for this model?
It depends on your supply. Lots of different designs are used in computer power supplies. Although they follow a somewhat similar theme, they still have lots of differences. You have to figure out which ICs are those that control the voltages, and then which are the resistors on your board that supply the feedback voltage to the regulator's feedback input.Also, in the original link posted by OP the guy is able to adjust the complete voltage range from one of the output. Tom66 chose different outputs for different voltage ranges. What is the difference? I want to use the SMPS as simple power supply in the range 1.5 to 20 @ 3 A max. How can I do this?
In order to vary the voltage you have to fool the ic by inhibiting the three voltage sensors on pins 1,2, &3. Pin 2 is to be connected to the 5v standby,pins 1&3 have to be connected to the 5v standby by means of a 4k7 pot to each pin across the 5v standby supply with the the pins on the wipers, and set the voltages to 3v on pin 1 and 0.5v on pin 3. Also disable the overvolts on pin 4 by connecting it to gnd.ok well, i messed someting up. yes wookie ur schematic is correct and the two values of r38 and r40 are correct. i unsoldered them very easily(it was very easy to get to on the edge of the board) i soldered 2 wires in place of one resisitor(as they are in parallel) i used a 20k resistor and a 50k pot. i failed to measure the total resistance before i turned the supply on. turns on for 2 seconds and shuts off. i replaced the origional resistors and same thing....only runs for 2 seconds. not sure if something got fried or what. im open to suggestions and input. i dont give up easily, id like to perfect this, but it may take a few PSUs to get it right! one more question; which rail does this vary? ie, 12v, 5v, 3.3v? ty
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