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Wireless microphone circuit with NAND gate

2016-11-05 01:02  
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Wireless microphone circuit with NAND gate
74LS04 is a TTL integrated circuit, there are six single-end input NAND gates. Three NAND gates can form an oscillator. When the power supply voltage is 5V, the oscillation frequency is approximately 90MHz; When supply voltage drops, frequency reduces; when supply voltage rises, frequency increases. Of course, the oscillation amplitude will also change, but has little effect. In this way, people can use the way bu changing the power supply voltage to adjust the frequency ( FM ). The specific approach is to use an audio amplifier IC BA328's output as its power supply. BA328 is a recording head amplifier.