Three-state logic flat ----- logic probe

Three-state logic flat, Logic Probe Keywords: three-state logic flat In the production of pulse circuits, the input and output state of each gate circuit are often required. Three-state logic plants are designed for this purpose. It can not only detect the high level of the circuit, the low level and high resistance state, but also detect the pulse signal in the circuit, which is a very useful electronic measuring gadget, which is shown in the drawings. When the test point of the circuit does not contact any signal circuit or in contact with a high impedance, due to the partial pressure of resistors R2, R3, diode VD1, VD2. The PNP-type triode VT1 and NPN type triode VT2 are closed, and LED1, LED2 are not bright. When the test point of the circuit is in contact with the high level, the base voltage rises high, the triode VT2 is turned on, and the light emitting diode LED2 is lit. The triode VT1 is still as close as it is, and the LED LED1 is not lit. When the test point of the circuit is in contact with the low level, the base voltage of the triode VT1 is lowered, and the triode VT1 is turned on, and the light emitting diode LED1 is lit. The triode Vt2 is closed, and the LED LED2 is not bright. When the circuit's test point is input, when a high frequency pulse signal is input, the two light-emitting diode turntable due to the high and low levels are constantly converted. It seems that both LEDs are on bright. If the frequency of the pulse signal is low, then the two light emitting diodes are flickering. In order to reduce the effect of logic, the resistor R1 is provided. The resistor R4 in the circuit is a current limiting resistor.

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