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Sunday, 30 October 2016

Traffic Light Controller


Traffic Light Controller
The circuit given here is substitute of old mechanical movement light controllers which are definitely not dependable. The circuit's planning and consecutive operation are finished by two CMOS ICs (IC1 and IC2) while the genuine power exchanging is finished by triacs, A 10V negative power supply is gotten specifically from the mains my method for D1, R1, D2, and C1.

Entryways N1 through N6 constitute IC2 while IC1 is a Johnson counter. N1 – N3 are wired as an astable multivibrator whose era can be balanced between 1 second and 10 seconds with VR1. 

The decade yields of IC1 are wired with the end goal that when Q0 and Q5 is high, the yield of N5 goes low. So also, the yields of N4 and N6 turn out to be low when Q1 to Q4 and Q6 to Q9 get to be low separately. Since we have negative supply, a low yield of any of the despises N4 to N6 cause the separate triac to flame. In this way, the proportions of the eras for the lights in the succession O:G:O:R are 1:4:1:4. Resistor R10 to R12 and capacitor C4 and C6 are totally fundamental, these maintain a strategic distance from spurious activating of the triacs which may hamper movement stream.

PARTS LIST
Resistors (all ¼-watt, ± 5% Carbon unless expressed generally) R1 = 5 Kω/5W; R2, R3, R4 = 22 Kω; R5 = 100 Kω; R6 = 1 Mω; R7, R8, R9 = 1 Kω; R10, R11, R12 = 100 Ω/1W; VR1 = 1 Mω
Capacitors
C1 = 1000 μF/16V; C2, C3 = 22 μF/16V; C4, C5, C6 = 00.1 μF/400V
Semiconductors
IC1 = CD4017; IC2(N1 – N6) = CD4049; D1 = BY127

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