Making a test for PWM Ic

Myads

Making a test for PWM Ic

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The PWM integrated circuits is constantly in switching power supplies of monitors and televisions.The most common are KA3842, KA3843, UPC 3843, KA 3882, UPC 3882, UPC 3842 and SG 3843 . Usually, the only way to diagnose a fault is by replacing (trial and error). This virtually makes it impossible to make operational testing prior to select those that are good, especially if we reuse some come from dismantling. We propose a simple and inexpensive to test these ICs. Bill of Materials Trafo 1 9 +9 or +12 12 - 500 m 2 diodes 1N4007 1 8-pin socket Led 1 Uf capacitor 1 47 X 63 VDC A 390 ohm resistor 1 / 2 W 1 pot 4 K7 Diagram How to use: To test, insert the IC into the socket and plug the tester. If the IC is nice, the LED will blink with a speed varying according to the variation of the pot. If it remains off or on is pifado .