Free electronic circuit design and schematic diagram
Logic indicator circuit / logic probe is used to identify logic level at any point of logic circuitry. The indicator can be visual (using LED, LCD, of 7 Segments) or auditory (using beeper or speaker). This circuit has a audible indicator, with the help of a loudspeaker to produce indication tone. Using the opamp,U1, as schmitt trigger, the Audio oscillator […]
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This is simple logic probe circuit. Logic probe is used to determine if a point in a circuit has high or low state when the circuit is in operation. Here is the schematic diagram of the circuit: When the probe is not touching any circuitry, this circuit consumes no current. It can happen because the voltage across the red LED […]
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We can use NE556 timer IC to make indication of static of terminal in digital logic audible. Audible logic probe can be very useful when we have to visually inspect a part while need to check the logic state on other point apart from the part. Here’s the circuit diagram: NE556 will act as oscillator controlled by IC1 (SN74132N) and […]
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A single CMOS IC is used on this logic probe. This logic probe shows three logic condition, High, Low, and Pulsing. Ind addition, there is no LED’s will glow if the probe input is neither hi or lo ( the high impedance state of tri-output logic IC’s). Here’s the circuit diagram: This logic probe using power from the logic circuit […]
Read moreThis is a simple circuit of Logic Probe for Tri-state Logics. This circuit can be built only in a few hours. Besides that, this circuit has some other advantages such as it is cheap, has high performance, and the LED will only light when tip of probe is touching a voltage source. A plastic ball-point pen can be used as […]
Read moreThis is a video tutorial of logic probe or logic analyzer. This video shows what is logic probe and how can the logic probe analyzes. There are two main operation in the logic probe work, first is timing analyze and second is state analysis. In this video also shows the different between them. Beside that, this video shows the sequential […]
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