Logic probe by IC 4050
When you learn digital circuit necessary tool for check logic of the digital. May flee don’t pass Logic probe for extremely amateur type our electronics emphasize economize keep before. I has interesting circuit comes to present be Logic probe by IC 4050 by pillar equipment be IC CMOS 4050 or CD4050 or LM4050. Be the integrated circuit gate buffer logic. I uses just one part or 1/6 only. From the circuit LED stick bright when input = logic low only.
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Categories: Detector, Digital Tags: cd4050, digital circuit testing, logic probe
Audible Logic Probe
When testing circuits with a logic probe, it is sometimes difficult to watch the LEDS on the probe to determine the logic state. With this probe the logic states are audible. This probe is designed for TTL circuits only but could be modified for CMOS. The way it works is as follows. The 5 volt power source will be the circuit under test. Clip the ground input of the probe to the ground of the circuit being tested. The other input lead is used to probe the different chips of the circuit being tested. Any input greater then 2 volts will be high and output a high tone through the speaker. Any input less then .8 volts will be low and produce a low tone through the speaker.
From :: http://home.maine.rr.com/randylinscott/feb99.htm
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