Led Running Lights
If you are looking for the miniature running LEDs light then here you can get one. The circuit in this site is is using the timer 555 1 to 10 decoder 7493 and 1 to 16 decoder 7441.
|R3, R4||220 Ohm|
|IC2||1 to 10 Decoder 7493 IC|
|IC3||1 to 16 decoder 7441 IC|
|(N1,N2) IC4||IC 7400 – NAND Gate|
|D1 – D16||LEDs|
|C1||Capacitor 5μ 25 V|
|BATT||Battery 5 Volt|
The circuit consists of three parts. The first part has an oscillator while the second has mod 16 counter 7493. The oscillator is wired in self-triggered mode, and the potentiometer VR1 is used for speed control of the running lights. That is, frequency can be varied from 21 Hz to less than 1 Hz.The counter outputs A, B and C are decoded by IC3 (the decoder 7442) and the outputs obtained on pins 1 to 9 of this IC.The D output of the counter is used for selecting the LEDs from D1 to D8 or D9 to D16. When D is low D1 to D8 are selected, and when D is high D9 to D16 are selected.For the selection of these LEDs, IC4 (7400) NAND gate is used. Thus, a sequential running effect is produced.
Project Submitted By : Aman Sunar
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