Guest message recorder circuit and principle introduction

Here, only one touch switch of the integrated circuit block T065 is used. It is small in size and low in power consumption, and is suitable for non-contact switching of small current appliances such as transistor radios.

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The working diagram is shown in the figure below. YF3 and YF4 and C3 and R3 form a monostable trigger. This circuit has only one steady state. When the trigger signal is input from the D terminal, YF3 is turned off, the potential of point A rises, and the potential of point B increases accordingly, causing the YF4 output level, and the feedback line is input to the input end of YF3, so that the YF3 output remains closed. But as C3 charges, the voltage across C3 rises exponentially.

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