How it works
In the tour is modification flashing to the brake light. The working start with the power to circuit or touch that brake. The timer-IC2 is driver current to transistors feed a clock signal pulsate out to pin 3 go to pin1 of IC1, count total of pulsation and will stop count when broad 8 pulses. By fall 2 of IC1 will reset itself. The transistor-Q1 is a trip to IC2 and besides results in pivot 3 of the IC2 reversion stage, by getting a electric potential dangle across R3 cause have output signal voltage at pin 7 of IC2 cause Q2 receive fore diagonal to drive current cause the bracken lamp glow up.
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The flashing of bake light while allude bake Hold it, Will flash continuously per set around 6 times per second. Which defines by the R3 and measure C3. The distance of each series is determined by the C2 and R1. The voltage that feeds to the circuit can use DC 12 volts of Car. The capacitors-C1 is a percolate to smooth the currents. The transistors-Q2 may use any number SM3180 .
How to build it
We can assemble all components on the universal PCB dining table. The wiring for lap wire and respective components. so, be careful about the mutual opposition of the electrolytic capacitors and Diodes correctly, Pin of the IC is not an mistake. And trap of transistors ( BC337 and BD139 ) you can look at the double downstairs . Components List
Resistors size ¼W +5 %
R1, R2 : 10K
R3 : 1M
R4 : 1.2K
C1 : 3.3uF 25V, Electrolyte
C2 : 1uF 25V, Electrolyte
C3 : 0.1uF 50V, Polyester
Q1 : BC337, 50V 800mA NPN Transistor
Q2 : BD139, SM3180
IC1 : CD4024, 7-Stage Ripple-Carry Binary Counter
IC2 : LM7555, CMOS Timer
Universal PCB Board not only that. Look :
Beautiful Car brake light circuit using BC327
We will add smasher to CAR brake light circuit. With a expose of 14 LEDs, visible distinctly, for safety and beautiful. The initiation format can fix by oneself as you like it. This racing circuit use the astable multivibrator for render a oscillate frequency so all LED dart.
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The working of the circuits
digit 1 : CAR brake light circuit When figure the light brake voltage, makes have ability supply 12V come in lawsuit LED6-LED9 luminescence or On. Besides the course will flow to change R2 go to bias peg base of Q1- BC327 PNP transistor and Q2-BC327, causes LED1-LED5 and LED11-LED14 the bright up. Which there are R1 and R3 help to limit a current that flow through LEDs enough liberate brake might supply 12V vanish hold LED every switch off. The components list.
Q1, Q2 : BC327 : 50V 1A PNP transistorrs
LED1-LED14 : lead display as you want.
R1, R4 : 22 ohms 0.5 watt 5 % resistors
R2 : 390 ohm, 0.5 watts 5 % resistors
R3 : 500 ohm, 0.5 watts 5 % resistors
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