Circuit Diagram of Three in One Tone Generator
This is a unique tone generator circuit that can generate three distinct tones according to the sound, generating three different logic levels (ie 0-1, 1&0, and 1&1). The circuit is designed around the digital IC 7400 (NAND gate). The operation of the circuit is like that of an oscillator circuit, where the frequency depends on the capacitors C1 and C2.
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