555 Happy Birthday electronic circuit diagram candle

The circuit consists of four light-controlled electronic switches, timing circuits, voice circuits, audio circuits, and other components. It is designed to celebrate birthdays or similar occasions, with features such as birthday candles that can be lit or extinguished. The system utilizes optical fibers through an optical switch, photodiodes, and an integrated circuit (IC1) among other components. When the light beam from the optical fiber reaches the birthday candles, the phototransistor's resistance between electrode 3DU3 decreases to a few kilohms or less, activating the 555 timer. This action triggers J1, disengages J1-1, and closes J1-2, establishing an ON path for the circuit. The timing circuit, composed of IC2, IC3, resistors (R2, RP2, R4, RP3), and capacitors (C3, C5, C6), determines the timing intervals. The delay for J2 to trigger IC4 is approximately 5 to 6 seconds, which activates an acoustic output circuit that plays "Happy Birthday." The transient stability of IC2 leads to a trigger for monostable IC3, creating a pulse width delay of about 10 to 15 seconds, during which J3 is activated to play the happy birthday tune. This cycle continues until the birthday candles are extinguished, at which point the voice and music cease. IC4 utilizes the CIC5607 voice IC, which contains the congratulatory message, while IC5 employs the CW9310, which holds the "Happy Birthday" song.

The circuit architecture is structured to facilitate an interactive birthday celebration through the use of light sensors and audio playback. The four light-controlled electronic switches are strategically placed to detect the illumination from the birthday candles. The optical fiber serves as a conduit for light, ensuring that the photodiode receives the necessary light input to function effectively.

Upon activation, the 555 timer (IC1) initiates the timing sequence necessary for the celebration. The components R2, RP2, and C3 in conjunction with IC2 create a delay mechanism that allows for a brief pause before the audio output is triggered. This delay is adjustable through the variable resistor RP2, providing flexibility in the timing of the audio playback.

The subsequent activation of IC4, which is responsible for voice output, is a critical component of the circuit. It is programmed to deliver a congratulatory message, enhancing the celebratory atmosphere. The audio output is further enriched by the CW9310, which plays the well-known "Happy Birthday" melody, creating a festive ambiance.

The use of monostable IC3 ensures that the audio playback is stable and repeatable, allowing for a consistent user experience. The timing intervals set by R4, RP3, and C6 determine how long the music plays, contributing to the overall enjoyment of the celebration.

The circuit is designed to be user-friendly, with a straightforward operational flow that activates upon detecting the light from the candles. This design not only serves its purpose effectively but also adds an element of fun and surprise to birthday celebrations, making it a valuable addition to any festive occasion. Circuit as shown, consists of four light-controlled electronic switches, timing circuits, voice circuits, and audio circuits and other components. Congratulations for a birthda y or celebration, with birthday candles were lit or extinguished song Sonata, birthday atmosphere thick. Optical fiber by the optical switch, photodiodes, IC1 and other components. When the point of birthday candles, the light beam coming from the optical fiber, phototransistor resistor between electrode 3DU3 reduced dozens of kilohms or less, and 555 start-up, J1 pull, J1-1 disengaged, J1-2 is closed, ON the circulation path.

By the timing circuit IC2, IC3, R2, RP2, C3, R4, RP3, C5 and other components. Timing td 1.1 (R + RP) C. Adjust RP2, the IC2 delay td1 1.1 (R2 + RP2) C3, about 5 to 6 seconds to J2 pull the trigger IC4, the acoustic output circuit just two English Happy Birthday. IC2 transient stability width over, triggered by the monostable IC3 and R4, RP3, C6 composition, so that IC3 is set, its pulse width of the delay td2 1.1 (R4 + RP3) C6, from about 10 to 15 seconds, so that in the period J3 pull by IC5 playing happy birthday electronic music.

J3 release, IC2 trigger again, and so on, until it is extinguished birthday candles, voice and music stopped. IC4 use CIC5607 voice IC, within reservoir Happy Birthday to congratulate language, IC5 use CW9310, within the reservoir, I wish you a Happy Birthday song.