Two Sets 10 channels O'scope and Multimeter Multi-Inputs Selector.

Two Sets 10 channels O'scope and Multimeter Multi-Inputs Selector --

Two rails of O'scope can be measure 20 points, or single rail can be measure 10 points and using another multimeter to measure 10 points.

O'scope And Multimeter Multi-Inputs Selectors :

This multi-inputs selectors was designed to measure many points of the circuit, the voltage level is 0 to 5V or logic pulse, I also drew a 40 channels monitoring points based on single-chip controller as 8748 long time ago, but I haven't complete it, actually is too lazy, and this two sets of pure logic circuit 10 inputs channels completed first, but this circuit was designed at about 21 years ago(1995), I were putted it in the box without completed until 8 years ago sorted out and found out the problems, complemented part of the circuit which wasn't completed, and finally the function was worked normal, the Vcc was provided by +5 V power supply, it can be change to add a 7805 with 9V battery, the total quiescent current consumption less than 20 mA, almost the power consumption focus on NE555 and LEDs. 

All the details shown in the completed projects forums.
Two Sets 10 channels O'scope and Multimeter Multi-Inputs Selector.





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