Voltase hobby

When testing diagram 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 diagram only but could be modified for CMOS. The way it works is as follows. The 5 volt power source will be the schema under test. Clip the ground input of the probe to the ground of the schema being tested. The other input lead is used to probe the different chips of the schema 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.

Audible Logic Probe  Circuit Diagram