Transformerless power supply for microcontroller. Learn how to assemble it ste...
Transformerless power supply for microcontroller. Learn how to assemble it step-by-step, understand the components used, and get tips for ensuring stable performance. Mar 6, 2026 · Conclusion: 9V DC Transformerless Power Supply Circuit is simple and is with low cost, as it removes the need for heavy transformer, therefore the circuit becomes small and compact. The PIC12/16/17 microcontrollers draw a maximum of 10 mA, even at the highest frequency and voltage of operation, therefore low current availability is not an issue. This circuit can provide regulated 9V DC for low current electronic devices so it is useful for small sensors, LED circuits and microcontroller projects. I have used numbering labels to explain each component and functionality of each component used in this circuit. This 4rth simple yet smart solution is implemented here using IC 555 in its monostable mode to control in rush surge in a transfomerless power supply via a zero crossing switching circuit concept, wherein the input power from the mains is allowed to enter the circuit only during the zero crossings of the AC signal, thereby eliminating the possibility of surge inrushes. Mar 6, 2026 · This project demonstrates how low-power electronic devices can be powered directly from AC mains using minimal components. Details: After the capacitor, the AC that passes through needs to be rectified into DC. They are lighter and smaller than normal. PCB'S and diagrams are shared. rwdlrvwiomwenbrzwquttpqwxggdgdtdutaojpbihh