LED Circle Effect Circuit
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Electronics hobbyists are always trying to design such circuits which gives flashing effect and looks decorative. It is not a critical job now. The use of few ICs makes it possible to give such an effect. We offer LED Circle Effect Circuit, which is a light that produces wheel effect due to the flashing of LEDs. In its simplest form, the circuit needs an oscillator for the flash timing, a divider and the LED driver. The 41 number of LEDs are arranged in such a way that produces circle effect. The frequency of flashing can be varied by preset VR1.About the Circuit :The circuit is built around two ICs as shown in the circuit diagram. IC1 is used as an oscillator. When power is on, IC1 starts oscillating. The frequency of oscillation is determined by timing components designed around R2/R1-VR1/C2, which can be preset to individual requirements by setting preset VR1. Firstly, capacitor C2 starts charging. This is taken as on time and when its voltage reaches to 2/3Vcc, its starts discharging. Now off time starts. When capacitor discharges to a voltage less than 1/3Vcc, it stars charging again. This process repeats and charging and discharging of capacitor produces square pulses at the output pin3 of IC1. These pulses are given to counter IC2. It has total ten outputs. But, in this project only first four outputs are used. At fifth output, IC2 gets reset and process repeats again. At every clock input at pin14, output at pin 3, 2, 4 and 7 of IC2 goes high one by one. Accordingly, transistor T3, T2, T1 becomes on one by one, which are used as a driver.At first clock pulse, pin3 becomes high, LED connected at pin3 through R9 glows. At second clock pulse, transistor T3 becomes on and 8 LEDs connected at the collector terminal of T3 through resistor R8 becomes on. At third clock pulse, transistor T2 becomes on and 16 LEDs connected at the collector terminal of T2 through resistor R7 glows. At fourth clock pulse, T1 becomes on and 16 LED connected at its collector terminal glows. At fifth clock pulse IC2 gets reset and above procedure repeats again. The circuit requires DC power supply of 12V, which is designed using rectifier diodes D1 and D2 and capacitor C4 to filter the rectified signal.
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