Talking Toy

You`ve probably seen many of these toys. They`ve been around for years, from the talking tickle me elmo to the talking furby, like the one shown above. How do these devices do what they do when you perform an action such as tickle them or press a certain part of them How do they talk In this article, we will go over how you can build a circuit w
Talking Toy - schematic

hich talks. The speakjet is a sound synthesizer chip which allows you to record sounds and then play back the prerecordered sounds. This is why they work perfectly to create devices such as talking toys. How it works is you connect this IC to a computer, and the chip comes with software so that you can program it to record the sounds which you want. The computer will generate the electrical signals onto the chip of the recorded sayings. These signals correspond to the words, sounds, which form the create the sentences, music, or sound effects of the audio you want. The speakjet chip allows you to program eight sounds; each sound is controlled and can be played back by one of the pins 1-4 and 6-9 of the IC. In the project we`ll be doing, the circuit will activated when you touch a specific part of it. So it will be touch-activated. Just like the tickle me elmo, when you press a certain part of the talking toy, it will activate the toy to utter the sound(s) which it is programmed to. Besides the speakjet synthesizer chip, two other major components we will need in this circuit are an amplifier and a speaker. The amplifier is to increase the audio signal from the synthesizer to loud enough so that the speaker can play it back. And we need speakers to play out the sound from the speakjet synthesizer chip. 5 1KG Resistors- These resistors are for R1, R2, R3, R4, and R5. Resistors R1, R2, and R3 limit the current running to...

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