![]() ![]() The voltage across R1 causes a current biased to Q2, driver transistor. What can we do? To increase it up! We help it with the transistors.Īnd R1 limits current to IC1. But as we know LM317 can power out of 1.5A. Current boosting circuit for LM317Ībove I said the circuit can power the 3A output current. It will make the output voltage is very steady. The IC1 is the main, DC variable voltage regulator IC, the famous LM317. Then, the unregulated voltage comes to an input of IC1 through R1. And the R6 limits the current to save LED1 Next, the capacitor-C1 filters this becomes the pulsed DC. ![]() Then, the AC18V comes to a diode bridge-BD1, to rectifies ACV to DCV, pulsed DC. T1-the step-down transformer converts AC-main to the low ACV, 18V at 3A current.F1-0.5A fuse to protect the circuit when overcurrent.In the 3A adjustable voltage regulator circuit above.įirst of all, get an AC main to the circuit. ![]()
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