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

Phantom PS for Microphone
Voice Disguiser Circuit
QPSK Demodulator Is A Good Match For Low-Cost Modulator
operating modes
EGR 450 Manufacturing Controls Project
Touch switch circuit
BCD THUMBWHEEL SET 99 min TIMER
PET Repair Model 4016
Build This Simple Power Supply For Your Intruder Alarm Project
Sound pretty inexpensive bed HI-FI circuit
PQY2 series magnetic disk control panning control circuit
A brushless DC motor road



Top