Logic probe


Posted on Jun 3, 2012

The probe indicates a high or low at 70% and 30% of V+ (5 to 12 V). One section of the voltage comparator (LM393) senses V in over 70% of supply and the second section senses V in under 30%. These two sections direct-drive the appropriate LEDs. The pulse detector is a CMOS oneshot (MC14538) triggered on the rising edge of the LM393 outputs through 1N4148 diodes


Logic probe
Click here to download the full size of the above Circuit.

With the RC values shown, it triggered reliably at greater than 30 kHz on both sine and square waves.




Leave Comment

characters left:

New Circuits

.

 


Popular Circuits

Car Alarm and Immobilizer
Daylight alarm with 555
Timing-threshold-and-load-driver
10hz 60mhz frequency meter
charger
Case Modding
Wire Tracer (Transmitter)
AT89C2051 Real Time Controller
Atmel 89C2051 In-Circuit Programmer
Asynchronous power wiring diagram



Top