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A simple logic probe. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Measuring technology

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Using a probe, the circuit of which is shown in the figure, you can determine the voltage level at the output of logic elements, control the passage of pulses and detect an open in the electrical circuit. When a logic 1 is applied to the input of the probe, transistor V1 enters saturation mode, and transistor V2 closes; As a result, LED H1 lights up with a red glow. If a logical 0 is applied to the input of the probe, then the transistor V1 will be closed, and V2 will be open. At the same time, LED H2 lights up with a green glow.

Simple logic probe

Resistor R3 is chosen so that if there is a high resistance at the input of the probe (an open in the circuit of the checked logic element), both LEDs do not light up.

The passage of a pulsed signal of a rectangular shape of positive polarity should cause the glow of one LED, and the negative - the other.

In a logic probe, you can use, for example. transistors of the KT342 series. Diodes V3, V4 - any low-power silicon, LEDs - AL102B (H1) and AL102V (H2).

Literature

  1. "Wireless World" (England). 1976 September

Publication: N. Bolshakov, rf.atnn.ru

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