RTL/TTL Probe Circuit

Published:2011/5/27 7:56:00 Author:Robert | Keyword: RTL, TTL, Probe | From:SeekIC

The static LED indicates the logic voltage level of the probe along its side. The dynamic LED's lighting indicates that there is a positive pulse or 1 pulse in the probe test port. Even the time is short while the pulse appearing, itcan still see the LED's lighting because this circuit has extended the pulse width to about 50ns. The pulse-extending device requires the input pulses is 100ns, 4V at least. The 1N4001 diode is used to prevent the damage caused by opposite connection of the power cord.



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