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Electronics- Logic Probe
Part 1 of Paper
....cuits). 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 circuit. The 555 tim.... Part 2 of Paper
....tages. The four diodes protect the IC from reverse polarity. Capacitor C1 prevents transient voltage from affecting the logic probe when the black lead is not connected. 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 di.... |
| Number of words: 428 - Approximate pages: 2 |
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