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Simple Logic Probe(CD4001)

2015-01-10 19:40  
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This article describes the Simple Logic Probe (CD4001). The principle is very simple, very practical. The circuit components can help you understand better grasp this principle. For example, in this circuit, you can go to find and buy these components: CD4001.

This simple logic probe has bothLEDs on with no signal at the input but due to the nor gates connected to the probe, indicates correctly when a high or low signal is present. It also works correctly for pulse trains. Normally bothLEDs are forward biased and therefore on, powered by the 12V supply. When a logic “high” is present at the probe, IC1a’s output goes low sending IC1b’s output high. This turns off LED1 but forward-biases (and turns on) LED2. Conversely, a logic “low” at the probe will send IC1b low, turning LED1 on and LED2 off.

Figure:1 Simple Logic Probe Circuit Diagram

Figure 1 Simple Logic Probe Circuit Diagram

 

 


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