This 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 chassis, so the logic probe has style and personalized touch. here is the circuit :
It’s very easy to use this logic probe. Just connect the power (alligator) clip to the circuit’s power supply and then touch the probe tip to the point that will be tested. If the voltage is less than 9/20 the power supply voltage, the LED will light green. The LED will light red when the voltage is greater than 11/20 the power supply voltage. The LED will appear orange because the LED oscillates between green and red due to A high-frequency signal. [Source: Swanson Technologies]
Possibly Related Articles:
- Audible Logic Probe
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... - Audible Logic Probe/Indicator
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... - Simple Discrete Logic Probe
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... - Logic Probe with Pulse Indicator
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... - Logic Probe – Video Tutorial
This 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...
| 
