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Sounds From The Old West

2018-01-16 07:13  
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This circuit shows how far integration can be taken: IC1, a Type HT82207 from Holtek does virtually everything. Only a (small) loudspeaker and the necessary selectors need to be added. The standard 18-pin Type HT82207 is an integrated sound generator, producing sounds typical of the Old West. The various sounds are selected by S1–S6 as listed below. In the quiescent state, the circuit draws a current not exceeding 1 μA.
S1 – bugleS2 – neighingS3 – sound of hoovesS4 – pistol shotS5 – crack of a rifleS6 – cannon fireCircuit diagram:

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