自行车回安全光栅电路-Bicycle back Safety
自行车回安全光栅电路-bicycle back safety light
flashing 13 led unit, 3v supply
also suitable for jogger/walkers
parts:
r1_____________10k 1/4w resistor
r2,r9,r10_____100k 1/4w resistors
r3-r8,r11-r16__10r 1/4w resistors
r17___________150r 1/4w resistor
c1______________1΅f 63v polyester capacitor
c2_____________10nf 63v polyester capacitor
c3____________100΅f 25v electrolytic capacitor
d1-d13_____red leds 5mm. or bigger, high efficiency
ic1,ic2________7555 or ts555cn cmos timer ic
sw1____________spst slider switch
b1_______________3v battery (2 aa 1.5v cells in series)
device purpose:
this circuit has been designed to provide a clearly visible light, formed by 13 high efficiency flashing leds arranged in a pseudo-rotating order. due to low voltage, low drain battery operation and small size, the device is suitable for mounting on bicycles as a back light, or to put on by jogger/walkers.
circuit operation:
ic1 is a cmos version of the 555 ic wired as an astable multivibrator generating a 50% duty-cycle square wave at approx. 4hz frequency. at 3v supply, 555 output (pin 3) sinking current operation is far better than sourcing, then led d1-d6 are connected to positive supply. in order to obtain an alternate flashing operation, a second 555 ic is provided, acting as a trigger plus inverter and driving leds d7-d12. d13 is permanently on.
the leds are arranged in a two series display as shown below, with a center led permanently on. this arrangement and the alternate flashing of the two series of leds provide a pseudo-rotating appearance.
led arrangement:
notes:
flashing frequency can be varied changing c1 value.
high efficiency leds are essential.
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flashing 13 led unit, 3v supply
also suitable for jogger/walkers
parts:
r1_____________10k 1/4w resistor
r2,r9,r10_____100k 1/4w resistors
r3-r8,r11-r16__10r 1/4w resistors
r17___________150r 1/4w resistor
c1______________1΅f 63v polyester capacitor
c2_____________10nf 63v polyester capacitor
c3____________100΅f 25v electrolytic capacitor
d1-d13_____red leds 5mm. or bigger, high efficiency
ic1,ic2________7555 or ts555cn cmos timer ic
sw1____________spst slider switch
b1_______________3v battery (2 aa 1.5v cells in series)
device purpose:
this circuit has been designed to provide a clearly visible light, formed by 13 high efficiency flashing leds arranged in a pseudo-rotating order. due to low voltage, low drain battery operation and small size, the device is suitable for mounting on bicycles as a back light, or to put on by jogger/walkers.
circuit operation:
ic1 is a cmos version of the 555 ic wired as an astable multivibrator generating a 50% duty-cycle square wave at approx. 4hz frequency. at 3v supply, 555 output (pin 3) sinking current operation is far better than sourcing, then led d1-d6 are connected to positive supply. in order to obtain an alternate flashing operation, a second 555 ic is provided, acting as a trigger plus inverter and driving leds d7-d12. d13 is permanently on.
the leds are arranged in a two series display as shown below, with a center led permanently on. this arrangement and the alternate flashing of the two series of leds provide a pseudo-rotating appearance.
led arrangement:
notes:
flashing frequency can be varied changing c1 value.
high efficiency leds are essential.
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北京双仪微电子将投资10亿元建全国唯一规模化量产能力的先进工艺技术生产线
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