Category Archives: LED Circuits

[Multi-Colour] Automatic Night Lamp Circuit Diagram Using LDR And CD4017

Automatic Night Lamp Circuit Diagram Using LDR And CD4017 Components Required: Resistors (All 1/4W)R1 – 220ER2 – 1M(Preset)R3 – 33K LEDs:(3m/5mm/8mm)L1- WhiteL2- YellowL3 – GreenL4 – BlueL5 – Red Transistor:Q1 – BC547Q2 – 8050 or SL100 IC:U1 – CD4017 LDRMomentary Switch (Push to on)PS – Power source 12VGeneral purpose PCB Nіghtlіghtѕ are uѕеful to show thе gеnеrаl lауоut оf a rооm without […]

20 Led Chaser Circuit Without Ic 555 | How To Build A Light Chaser Circuit Using Cd4017 And Cd4013

20 Led Chaser Circuit Without Ic 555 | How To Build A Light Chaser Circuit Using Cd4017 And Cd4013

This is a simple 20 led chaser circuit built using the decade counter ic CD4017 and Dual flip flop ic CD4013. CD4017 is wired as divide by 10 counter. One flip-flop of CD4013 is wired as multivibrator and another flip flop is wired as divide by 2 counter. Output pin 2 from CD4013 is connected […]