It has small notch on one side which is identified as pin 1. It consists of 4 independent NOR gate in a single chip. Each gate has 2 inputs and 1 output. Working voltage range of IC is from 5V to 15V. It can deliver approx.
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This logic probe circuit using NOR gates is useful for people who need an instrument to measure the logic levels on digital circuits. This circuit is implemented with CMOS IC technology and is recommended for testing circuits using the same technology. The voltage required for the logic probe to work, is obtained from the circuit under test.
Be careful not to reverse the voltage terminals. To avoid this problem, it is best to set the colors of each of the connecting cables. For example:.
The operation of this circuit is very simple. The final use of the circuit is very important, therefore, to make its use more comfortable, an elongated printed circuit board is suggested. Looking at the circuit diagram. The signal we want to measure is applied to CN1 terminal.
The inverted signal is applied to two LEDs. Which of the LED lights up depends on the voltage level at the output of the gate. If there is a pulsating signal, the red and green LEDs will light slightly. When a pulsating signal is being sensed, a yellow LED will flash.
With these components, an oscillator is implemented. The oscillator output is connected to the 4th NOR gate, wired as an inverter gate. The output of this inverter gate is connected to a yellow LED via a resistor. This oscillator is continuously triggered by the output of the first NOR gate. Name required. E-mail required. Logic probe circuit using CD IC This logic probe circuit using NOR gates is useful for people who need an instrument to measure the logic levels on digital circuits.
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CD4001 - Quad 2 Input NOR Gate
Logic probe circuit using CD4001 IC