Secure electronic firecracker circuit

Published:2011/5/3 8:25:00 Author:Christina | Keyword: Secure, electronic firecracker | From:SeekIC

The Secure electronic firecracker circuit is as shown in the figure. ICl is the KD-5601 integrated circuit which can issues the sound of firecracker. When you using the match to fire the electronic firecracker, the match's light acts on the photoresistor RG to let the resistance decreases rapidly, the transistor VTl gets into the conduction state, ICl starts to work because the positive pulse. The output signal of ICl is magnified by the composite pipe which is composed of the transistor VT2, VT3, and it promotes the loud speaker BL to send out the sound of firecracker. At the same time, three different colors of light-emitting diode LEDl ~ LED3 turn on too, and the light spreads to the top of the glass tube by the optical fiber. After a few seconds, the circuit automatically stops working. When you are debugging and change the resistance of the potentiometer RP to make the photoresistor RG has no light, the ICl stops working, IC1 works if there is light irradiation. You can adjust the resistor R4 to make the LED flashes with the sound of firecracker. Also if you adjust R5～R7, you can change the brightness of LEDl1～LED3.



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