Logic probe on one chip. Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Logic probe on one chip. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Measuring technology

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Logic probe on a single chip

A diagram of such a probe is shown in the figure. In the absence of an input signal at the input of the element D1.1 - a low logic level, at the input D1.2 - high, at the input D1.3 - low. LEDs H1 and H2 do not light up.

If a logical "1" is applied to the input of the probe, the output of element D1.1 will be a logical "0", a current flows through the H1 LED, causing it to glow. Elements D1.2 and D1.3 remain in their original state.

If there is a logical "0" at the input, then the output of the element D1 3 will also be "0" and the LED H2 starts to glow. At the output of element D1.1, there will be a high logic level and LED H1 will not light.

The following figure shows a schematic diagram of a logic probe, the indicator of which is a seven-segment indicator. The state of outputs of logic elements is displayed on the indicator in the form of numbers "1" and "0".

Logic probe on a single chip

The principle of operation of this probe is similar to the previous one.

Transistor V1 in the described two probes can be any low-power silicon, and V2 - both germanium and silicon. If a germanium transistor is used, then the V4 diode must be silicon, for example KD103A.

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