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Beginning of Paper
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LOGIC PROBE SUMMARY
Logic Probe is one of the basic troubleshooting tools for common electronic logic circuits (TTL circuits). Almost all video game circuit boards are built using TTL chips. These chips will occasionally fail and the Logic Probe is a tool that affords us a look into what may be failing, and it‘¦s a very handy measuring device used to determine output logic levels. The 555 timer IC is used in this cir ....
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Middle of Paper
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.... Pin 5 of the 555 IC is grounded through resistor R1. The logic probe will indicate a HIGH for 2V or greater, and a LOW for 0.8V or less.
To use this logic probe, follow the procedure.
1. Connect red power lead to +5V of circuit under test.
2. Connect black lead to ground of circuit under test.
3. Touch probe tip to point in digital circuit to be tested.
4. One or the other LED indicator should light. If both light, the tip is disconne ....
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ADDITIONAL FEATURED ESSAYS
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