Flashy Christmas Lights
Saturday, April 30, 2011
Flashy Christmas Lights
This simple and affordable circuit built about a well-liked CMOS hex inverter IC CD4069UB gives four sequential switching outputs that might be utilized to control 200 LEDs (50 LEDs per channel), driven directly from mains supply. Input supply of 230V AC is rectified by the bridge rectifiers D1 to D4. Soon after fullwave rectification, the average output voltage of about 6 volts is obtained across the filter comprising capacitor C1 and resistor R5. This supply energises IC CD4069UB. Flashy Christmas Lights
All gates (N1-N6) of the inverter have been utilised here. Gates N1 to N4 have been utilised to control four high voltage transistors T1 to T4 (2N3440 or 2N3439) which in turn drive four channels of 50 LEDs each and every via present limiting resistors of 10-kilo-o Base drive of transistors might be adjusted with the aid of 10-kilo-ohm pots supplied in their paths. Remaining two gates (N5 and N6) form a low frequency oscillator. The frequency of this oscillator could be changed by way of pot VR1. When pot VR1 is adjusted To get the top outcomes, a low leakage, very good high quality capacitor should be utilized for the timing capacitor C2
