555 logic test circuit diagram pen

Posted on Mar 28, 2007

As shown in Figure 555 is a simple logic circuit test leads. Test pen 555 as the core, it will take a Schmitt trigger, the logic state of the test for digital circuit. 2,6 555

555 logic test circuit diagram pen
Click here to download the full size of the above Circuit.

feet and then, when the input signal level is 0, 555 set, LED2 light; when the input is 1, LED1 lights. For example, when Vdd 4.5V, the measurement TTL circuit, adjust RP1, so 5 feet potential 2.4V, the Schmitt trigger R end (6 feet) trigger level 2.4V, S end (2 feet ) level is 1.2V. When the input level is higher than 2.4V, LED1 lights; below 1.2V, LED2 light. This circuit is used to test the operating voltage of -24V PMOS circuit.

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