Inductive Members ----- Electric Probe

Induction type electric press, Electric Probe Keywords: inductive electric press The author used the discarded quartz small alarm clock board to make a "1.5V buzzer induction test", which is now as follows: as shown in the drawings, the buzzer IC and buzzer are small circuits in quartz small alarm clock. On the board, as long as C, D is found (C, D is two points for the beep trigger point, the buzzer can send the "sound") and the IC power terminal, access T1 to T4 according to the drawings For the type of triode, when the induction terminal A (special sensitivity point), or the B point (general type) is signal input, when T1, T2, T3, T4 are turned on, then the C point potential is lowered, the beep IC is Trigger and ringing a name similar to "蝈蝈". This circuit can also be loaded into the small electrosphere due to the small circuit board. The experiment A is particularly sensitive, and it can vote from 1.5cm apart from the wire insulation layer; it can also vocal around 10cm apart from the display (different screens, the distance is different), and B point is general. This test pen has a biggest feature - not being affected by the light, very intuitive. 4 triodes in this circuit, such as high β value, the sensing sensitivity will be higher.

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