Gas-sensitive alarm circuit three
Source: InternetPublisher:抄写员 Keywords: Alarm circuit speaker oscillator potentiometer Updated: 2020/05/08
It uses the KD28 integrated circuit as the audio oscillator and drives the speaker B to produce sound;
it uses the 7806 three-terminal fixed integrated voltage regulator as the DC working power supply.
Adjust the potentiometer RP to change the sensitivity of the device.
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