TTL Audible Logic Probe

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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.