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Gift - the heart of the circuit flash

2017-02-04 00:42  
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This article is a gift - the heart of the flash circuit schematic. To more effectively grasp this principle, the proposal combine text read schematics. The circuit is simple but effective. Figure: The circuit consists of a 4047 years of low-power monostable / astable multivibrator, IC1, for unstable modes to provide timing pulses to control the flash rate of the led. Complete astable mode, pins 4,5,6, and 14 are connected to 12 v DC and pins 7,8,9,12 are connected to ground. Pins 1 and 3 connected to C2 and pins 2 and 3 are connected to potentiometer R9. A fixed value resistor can be used in place of the potentiometer R9, if the flash rate is not adjusted. The three pins resistor - capacitor timing circuits. Output pulses from the 4047 from the pins 10, 11 and 13. Pin 10 Q output and pin 11 this question is not output. These tw1o pin is onnected to R6 and R7
, Respectively. Second and third quarters of collectors connected to R4 and R5 are connected to the cathode of the yellow light emitting diodes. Pin 13 is connected to the output of the oscillator and R8, which is connected to the first quarterly basis. The collector of Q1 is connected to R3, it is connected to the cathode of the red lead. The emitters of the three transistors connected to ground. Green light-emitting diode is connected to R1 and R2, connected to 12 volts DC. Resistors r1 r8 is a current limiting resistor and the correct wattage applied to these resistors to prevent excessive heat. Resistor value may change different brightness led. This circuit uses PS1, wall transformer, which is connected to a filter capacitor C1. It must betw1een 10 10-15 volts DC, and at least 500 ma. Perhaps the most difficult part of the building, making this project a printed circuit board. Board for prototyping lasted several hours, so use dry transfers. Using different techniques, such as photo resist, or accelerate the experienced amateur. Once the board is etched and drilled the jumper should be placed on the board and soldering. The next 84 years should be placed in the yellow light emitting diode board border, followed by 42 red led, and then make up the heart of the green light-emitting diodes 16 and I believe the United States resistors r1 r9 and capacitors C1and C2 should be placed in the Then under the Board the power, PS1. The socket is used for prototype smart cards and transistors. The information content of a socket is required, but sockets transistors. Particularly careful handling of smart cards complementary metal oxide semiconductor, as an electrostatic discharge can destroy it. When you have finished welding, check the board in the wrong. If everything looks good, power. Once power is applied to the circuit , the red LED should blink again. Flashing yellow light emitting diode should be turned on and off, but only the other yellow lead it should be at a time. The green LED will remain at all times. flash rate can be adjusted steering R9. Master the principles you can give love a surprise for you. 


figure1 Flashing Heart