Switching Regulator Circuit using IC uA78S40 is called a buck converter. It change high input voltage to lower output voltage with smartly and easily. IC uA78S40 chip is good for power supply. It has built-in parts like voltage reference that change with temperature, oscillator for duty cycle, strong switch, separate op-amp and its own diode. […]
Power Supply Circuits
Transformerless 12V Switching Power Supply Circuit
Transformerless 12V Switching Power Supply Circuit is small, smart and with no big transformer. It changes high AC to steady low DC using fast switch. Circuit is lightweight, good for low power, embedded, IoT and for industrial control. This circuit requires 12V 120mA output and works with 85 to 230V AC and uses LNK304 IC. […]
Simple Time Delay Circuit for DC Power
Simple Time Delay Circuit for DC Power uses SCR. It is very useful in many uses and is easy to understand. Need wait before device ON? Then this circuit gives delay after power ON. Circuit is good to turn devices one-by-one and avoid current spike. Max input DC for this circuit is 24V. Circuit Working: […]
Simple Mains Powered LED Light Circuit
Simple Mains Powered LED Light Circuit runs on 230V AC mains. It uses capacitor dropper to limit the current. LEDs in series-parallel are cheap and easy for mains lighting. They are with bright white light and no big transformer. It is good for low power light needs. Circuit Working: Parts List: Component Type Value/Specification Quantity […]
Simple AC Mains Powered LED Night Light Circuit
This is Simple AC Mains Powered LED Night Light Circuit which runs on AC mains power 230V. With no big transformer needed. It can light 24 bright white LEDs with each takes 50mA current. It is small, cheap and good for night room light. Circuit uses capacitor power supply, bridge rectifier and filter capacitor to […]
Simple Boost Converter LED Torch Circuit using IC MAX660
Simple Boost Converter LED Torch Circuit using IC MAX660 is small but useful light tool. This project use MAX660 chip to make LED torch work well. MAX660 boost 3V battery to higher voltage and can light many LEDs. It is good for battery devices needing more voltage and with no inductor needed. Circuit design also […]