Test probe circuit

2016-01-23 07:52  
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Test probe circuit
This circuit can detect repeatability of bubart system level and pulse. Because indicator light drived by switch transistor Q3 is very light, whenthis probe is used as binary system level indicator,the not stored switch should be closed,it does notneed to press reset button switch continuously. When the main switch isput on aide position, peopel must use two input together. Cable extract from aide input jack should beconnected to logic circuit's second test point to inspect the two signal being consistent or not. All small signal diodes are 1N914, and the probe power current is about 160mA.


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