9 Sec. Timer control Relay circuit

IC 555 timer output at pin 3 will be high and the voltage at pins 6 and 2 of the timer will be a little less than the lower trigger point, or about 3 Vdc. 

That time the switch is opened, the transistor in parallel with the timing capacitor (22uF) is shut off allowing the capacitor to begin charging and the IC 555 timer circuit to produce an approximate one second clock signal to the decade counter. The counter advances on each positive going change at pin 14 and is enabled with pin 13 terminated low. When the 9th count is reached, pin 11 and 13 will be high, stopping the counter and energizing the relay. Longer delay times can be obtained with most capacitor or most resistor at pins 2 and 6 of the IC 555 timer

 

 brightness - With used 40 LEDs, We can fill the taillight evenly with light, thereby making the most of the limited area I’ve got.
Higher brightness – I can make the brake light brighter than stock.
Lower power – At maximum brightness (which I won’t use), this light takes 10 Watts — less than the 18 Watts the normal taillight takes.

 Format

Circuit & Step by Step to build it –>

40 LED bicycle Tail Light Circuit

DIY: Step by Step

Step 1

Cutting the blank PC board. The template shows two patterns – the one on the left is for 12x 3W LEDs, which would have been twice as brite!

Step 2

Step 2 : 3M Reflective tape applied behind LEDs.

Step 3

 Step3 : Cutting to fit — 3M Reflective tape applied behind LEDs. 

Step 4.

 Step4 :

Step 5 ut the resistor and soldering.

Step 7

The narrow-angle LEDs make up the two brighter spots.

40 LED bicycle tail light.