4-Way Logic Probe


Posted on May 23, 2012

This logic probe has four channels and uses two IF quad comparators to drive four bicolor LEDs. SI and SIB program the co


4-Way Logic Probe
Click here to download the full size of the above Circuit.

mparator trip levels for TTL and CMOS. R6 through R13 bias the probe inputs to prevent the probe from indicating a high for an open circuit. An open circuit will produce an off indication on the LED. The LEDs will indicate one color for high, the other color for low, and intermediate colors for pulsing (assuming a duty cycle between 30 and 70%). The color that corresponds to high or low depends on how you connect the LEDs.




Leave Comment

characters left:

New Circuits

.

 


Popular Circuits

Simple continuity checker
27Mhz and 49Mhz rf oscillator-transmitter
how to make simple active low pass
Wireless switch using arduino and a mac circuit
bluetooth controlled relay
DDC-Online
Marty I have a 1991 350SDL that has the center vent not



Top